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源码剖析,权限管理系统之字典

2019-05-03 08:13 来源:未知

客户端代码:

前言

学习开发只有两件事是值得做下去的。第一是国外人的书,第二是官方的文档。

4.5 代码(字典)管理

系统代码是平台内置的、通用的、统一的数据描述。

代码管理(数据字典)是整个平台中数据描述的有效机制。通过界面进行可视化的操作和维护,能快速录入和修改平台上统一的字典数据。有效提高了数据的重复利用率和产品、项目的开发效率。整个数据字典数据为框架平台所共享,用户可以更好地对系统进行自定义管理,以满足自己的个性化需求。

代码管理的功能作业区(用户操作)界面如下图4.5-1所示,通过主要的操作按钮和信息内容可知其功能有:

① 新增代码组、代码,编辑代码组、代码,
② 删除代码组、代码,移动代码,
③ 代码组、代码的唯一标识,排序功能和备注信息等。

其中功能操作按钮的状态会根据选择的左侧树型中不同节点和不同登录用户的动作权限而改变。

平台在目前仅支持二级深度的树型代码结构,可根据实际需要进行添加、修改、删除或移动等对平台代码进行分类和调整。

Web前端 1 

图4.5-1  代码管理界面

#region LoadCodeTypes, LoadCodes
        private void LoadCodeTypes(TreeNode currentNode, DMESYS_SYSCODE_TYPE currentCodeType)
        {
            List<DMESYS_SYSCODE_TYPE> subCodeTypes = null;
            if (currentCodeType != null)
                subCodeTypes = DBOSYS_SYSCODE_TYPE.GetSubCodeTypes(currentCodeType);
            else
                subCodeTypes = DBOSYS_SYSCODE_TYPE.GetSYS_SYSCODE_TYPEEntities();

            foreach (DMESYS_SYSCODE_TYPE rt in subCodeTypes)
            {
                TreeNode node = currentNode.ChildNodes.Add();
                node.Tag = rt;
                node.Text = rt.Name;
                node.CollapsedImageIndex = 1;
                node.ExpandedImageIndex = 2;

                LoadCodeTypes(node, rt);
            }
        }

        private void LoadCodes()
        {
            codes.Clear();
            codes = DBOSYS_SYSCODE.GetSYS_SYSCODEEntities();

            foreach (DMESYS_SYSCODE r in codes)
            {
                TreeNode tn = CallFindNode(r.Syscode_Type_Id, tvCodes);
                if (tn != null)
                {
                    TreeNode node = tn.ChildNodes.Add();
                    node.Tag = r;
                    node.Text = r.Name;
                    node.CollapsedImageIndex = 3;
                    node.ExpandedImageIndex = 3;
                }
            }
        }

        private TreeNode FindTreeNode(string codeTypeId, TreeNode tnParent)
        {
            if (tnParent == null || tnParent.Tag is DMESYS_SYSCODE)
                return null;
            if ((tnParent.Tag as DMESYS_SYSCODE_TYPE).Id == codeTypeId)
                return tnParent;
            TreeNode tnRet = null;
            foreach (TreeNode tn in tnParent.ChildNodes)
            {
                tnRet = FindTreeNode(codeTypeId, tn);
                if (tnRet != null)
                    break;
            }
            return tnRet;
        }

        private TreeNode CallFindNode(string codeTypeId, TreeControl treeView)
        {
            TreeNodeCollection nodes = treeView.RootNodes[0].ChildNodes;
            foreach (TreeNode n in nodes)
            {
                TreeNode temp = FindTreeNode(codeTypeId, n);
                if (temp != null)
                    return temp;
            }
            return null;
        }
        #endregion

 

 1 <html>
 2 <head>
 3 <script>
 4 var socket;
 5 if ("WebSocket" in window) {
 6 var ws = new WebSocket("ws://127.0.0.1:8181");
 7 socket = ws;
 8 ws.onopen = function() {
 9 console.log('连接成功');
10 };
11 ws.onmessage = function(evt) {
12 var received_msg = evt.data;    
13 document.getElementById("showMes").value =evt.data "n";
14 };
15 ws.onclose = function() {
16 alert("断开了连接");
17 };
18 } else {
19 alert("浏览器不支持WebSocket");
20 }
21 function sendMes(){
22 var message=document.getElementById("name").value ":" document.getElementById("mes").value;
23 socket.send(message);
24 }
25 </script>
26 </head>
27 
28 <body>
29 <textarea rows="3" cols="30" id="showMes" style="width:300px;height:500px;"></textarea>
30 <br/>
31 <label>名称</label>
32 <input type="text" id="name"/>
33 <br/>
34 <label>消息</label>
35 <input type="text" id="mes"/>
36 <button onclick="sendMes();">发送</button>
37 </body>
38 </html>

Runtime

4.5.1 新增、编辑和删除

新增代码组和代码:点击展开树形菜单“系统代码”,可以看到平台内置的一部分代码组和代码。选择“系统代码”后点击“新增分类”按钮,可以添加代码组;选择已有的代码组,点击“新增代码”按钮,可以添加具体的代码。

在新增代码组或代码的过程中,其中带红色星号标记“*”的条目,标识、名称和排序ID是必须要填写的内容。平台会检测该代码组或代码的标识、名称在平台上的合法性,确保代码组或代码的标识、名称的唯一性和可用性。

具体添加代码组、代码的操作界面如下图4.5.1-1所示:

 Web前端 2

 Web前端 3

图4.5.1-1  新增代码组、代码

private void InfoUpdatedADD()
        {
            if (dmeObj == null)
            {
                lbInfo.Text = "在“系统代码”下新增如下代码分类";
                return;
            }

            if (dmeObj != null && dmeObj is DMESYS_SYSCODE_TYPE)
            {
                dmeCodeType = dmeObj as DMESYS_SYSCODE_TYPE;
                lbInfo.Text = "在代码分类“"   dmeCodeType.Name   "”下新增如下代码";
                return;
            }
        }

        private bool InfoUpdatedEDIT()
        {
            if (dmeObj == null)
            {
                lbInfo.Text = "加载代码类型信息时出错!";
                lbInfo.ForeColor = Color.Red;
                ucCodes.IsEnabled(false);
                return false;
            }

            if (dmeObj != null && dmeObj is DMESYS_SYSCODE_TYPE)
            {
                dmeCodeType = dmeObj as DMESYS_SYSCODE_TYPE;
                lbInfo.Text = "编辑代码分类“"   dmeCodeType.Name   "”";
                return true;
            }

            if (dmeObj != null && dmeObj is DMESYS_SYSCODE)
            {
                dmeCode = dmeObj as DMESYS_SYSCODE;
                lbInfo.Text = "编辑代码“"   dmeCode.Name   "”";
                return true;
            }

            return false;
        }

        private bool InsertorUpdateCodes()
        {
            if (dmeCode == null)
            {
                dmeCode = new DMESYS_SYSCODE();
            }

            if (dmeCodeType == null)
            {
                dmeCodeType = new DMESYS_SYSCODE_TYPE();
            }

            if (action == Action.ADD)
            {
                if (dmeObj == null && DoValidatedCodes())
                {
                    dmeCodeType.Id = FeiQing.DBO.DBOService.GetID();
                    DBOSYS_SYSCODE_TYPE.InsertDMESYS_SYSCODE_TYPE(dmeCodeType);
                    return true;
                }
                if (dmeObj is DMESYS_SYSCODE_TYPE && DoValidatedCodes())
                {
                    dmeCode.Syscode_Type_Id = dmeCodeType.Id;
                    dmeCode.Id = FeiQing.DBO.DBOService.GetID();
                    DBOSYS_SYSCODE.InsertDMESYS_SYSCODE(dmeCode);
                    return true;
                }
                return false;
            }

            if (action == Action.EDIT)
            {
                if (dmeObj is DMESYS_SYSCODE_TYPE && DoValidatedCodes())
                {
                    dmeCodeType.Id = (dmeObj as DMESYS_SYSCODE_TYPE).Id;
                    DBOSYS_SYSCODE_TYPE.UpdateDMESYS_SYSCODE_TYPE(dmeCodeType);
                    return true;
                }
                if (dmeObj is DMESYS_SYSCODE && DoValidatedCodes())
                {
                    dmeCode.Id = (dmeCode as DMESYS_SYSCODE).Id;
                    DBOSYS_SYSCODE.UpdateDMESYS_SYSCODE(dmeCode);
                    return true;
                }
                return false;
            }

            return false;
        }

        private bool DoValidatedCodes()
        {
            if (String.IsNullOrEmpty(ucCodes.LbTxtTag))
            {
                lbTip.Text = "“标识”不能为空。";
                lbTip.ForeColor = Color.Red;
                return false;
            }
            if (String.IsNullOrEmpty(ucCodes.LbTxtName))
            {
                lbTip.Text = "“名称”不能为空。";
                lbTip.ForeColor = Color.Red;
                return false;
            }
            if (String.IsNullOrEmpty(ucCodes.LbTxtOrder))
            {
                lbTip.Text = "“排序ID”不能为空。";
                lbTip.ForeColor = Color.Red;
                return false;
            }
            if (!FeiQing.Util.DataValidator2.IsNumber(ucCodes.LbTxtOrder))
            {
                lbTip.Text = "“排序ID”必须为数值。";
                lbTip.ForeColor = Color.Red;
                return false;
            }

            if (dmeObj == null && dmeCodeType != null && action == Action.ADD)
            {
                dmeCodeType.Tag = ucCodes.LbTxtTag;
                dmeCodeType.Name = ucCodes.LbTxtName;
                dmeCodeType.Order_Id = Int32.Parse(ucCodes.LbTxtOrder);
                dmeCodeType.Remark = ucCodes.LbTxtRemark;
            }
            if (dmeObj is DMESYS_SYSCODE_TYPE && dmeCode != null && action == Action.ADD)
            {
                dmeCode.Tag = ucCodes.LbTxtTag;
                dmeCode.Name = ucCodes.LbTxtName;
                dmeCode.Order_Id = Int32.Parse(ucCodes.LbTxtOrder);
                dmeCode.Remark = ucCodes.LbTxtRemark;
            }
            if (dmeObj is DMESYS_SYSCODE_TYPE && dmeCodeType != null && action == Action.EDIT)
            {
                dmeCodeType.Tag = ucCodes.LbTxtTag;
                dmeCodeType.Name = ucCodes.LbTxtName;
                dmeCodeType.Order_Id = Int32.Parse(ucCodes.LbTxtOrder);
                dmeCodeType.Remark = ucCodes.LbTxtRemark;
            }
            if (dmeObj is DMESYS_SYSCODE && dmeCode != null && action == Action.EDIT)
            {
                dmeCode.Tag = ucCodes.LbTxtTag;
                dmeCode.Name = ucCodes.LbTxtName;
                dmeCode.Order_Id = Int32.Parse(ucCodes.LbTxtOrder);
                dmeCode.Remark = ucCodes.LbTxtRemark;
            }

            return true;
        }

 

编辑代码组和代码:主要是在代码组或代码的标识,名称,排序,备注等信息发生变更的情况时进行的编辑操作。点击展开树形菜单“系统代码”,在树型目录下选择一个代码组或者代码后点击“编辑”按钮,即完成对应代码组或代码信息的修改。具体编辑代码组、代码的操作界面如下图4.5.1-2中所示:

 Web前端 4

图4.5.1-2  编辑代码组、代码

 

删除代码组和代码:点击展开树形菜单“系统代码”,在树型目录下选择一个代码组或代码后点击“删除”按钮,图4.5.1-3显示了删除操作的提示对话框界面。

备注:对于拥有代码的代码组是无法直接删除的,首先需要删除其下属的代码。

 Web前端 5

 Web前端 6

图4.5.1-3  删除代码组或代码提示

 

private void btnDelete_Click(object sender, System.EventArgs e)
        {
            if (IsCodeType())
            {
                if (selectedNode.ChildNodes.Count > 0)
                {
                    GUIHelper.MessageToUserInfo("提示:该代码分类包含代码,无法直接删除!");
                    return;
                }
                if (GUIHelper.MessageQuestion("确定要删除代码分类“"   (selectedObj as DMESYS_SYSCODE_TYPE).Name   "”吗?", "删除代码分类"))
                {
                    DBOSYS_SYSCODE_TYPE.DeleteDMESYS_SYSCODE_TYPE(selectedObj as DMESYS_SYSCODE_TYPE);
                    btnRefresh_Click(sender, e);
                    return;
                }
            }
            if (IsCode())
            {
                if (GUIHelper.MessageQuestion("确定要删除代码“"   (selectedObj as DMESYS_SYSCODE).Name   "”吗?", "删除代码"))
                {
                    DBOSYS_SYSCODE.DeleteDMESYS_SYSCODE(selectedObj as DMESYS_SYSCODE);
                    btnRefresh_Click(sender, e);
                    return;
                }
            }
        }

 

 

SEL

4.5.2 移动代码

点击展开树形菜单“系统代码”,选择一个代码后点击“移动”按钮,如下图4.5.2-1中所示,选择需要移动到的目标代码组,点击确认,即可完成代码的调动。目前平台上只支持代码移动,代码组暂时不支持移动。

 Web前端 7

图4.5.2-1  移动代码

#region LoadCodeTypes
        private void LoadCodeTypes(TreeNode currentNode, DMESYS_SYSCODE_TYPE currentCodeType)
        {
            List<DMESYS_SYSCODE_TYPE> subCodeTypes = null;
            if (currentCodeType != null)
                subCodeTypes = DBOSYS_SYSCODE_TYPE.GetSubCodeTypes(currentCodeType);
            else
                subCodeTypes = DBOSYS_SYSCODE_TYPE.GetSYS_SYSCODE_TYPEEntities();

            foreach (DMESYS_SYSCODE_TYPE rt in subCodeTypes)
            {
                TreeNode node = currentNode.ChildNodes.Add();
                node.Tag = rt;
                node.Text = rt.Name;
                node.CollapsedImageIndex = 1;
                node.ExpandedImageIndex = 2;

                LoadCodeTypes(node, rt);
            }
        }
        #endregion

        private bool MoveCode()
        {
            if (destObj == null)
            {
                lbTip.Visible = true;
                return false;
            }

            if (destObj is DMESYS_SYSCODE_TYPE)
            {
                target.Syscode_Type_Id = (destObj as DMESYS_SYSCODE_TYPE).Id;
                DBOSYS_SYSCODE.UpdateDMESYS_SYSCODE(target);
                return true;
            }

            return false;
        }

 

 

winform服务端代码:

定义
/// An opaque type that represents a method selector.
typedef struct objc_selector *SEL;

注:需先引入Fleck包Web前端 8

sel_getName
/// Returns the name of the method specified by a given selector.
// 通过 SEL 返回方法名字
OBJC_EXPORT const char * _Nonnull sel_getName(SEL _Nonnull sel)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

NSLog(@"--- %s", sel_getName(@selector(testFormat)));

打印:

TestProject[22016:6798169] --- testFormat

 

sel_registerName
/** 
 * Registers a method with the Objective-C runtime system, maps the method 
 * name to a selector, and returns the selector value.
 * 
 * @param str A pointer to a C string. Pass the name of the method you wish to register.
 * 
 * @return A pointer of type SEL specifying the selector for the named method.
 * 
 * @note You must register a method name with the Objective-C runtime system to obtain the
 *  method’s selector before you can add the method to a class definition. If the method name
 *  has already been registered, this function simply returns the selector.
 */

// 注册一个方法,对这个runtime系统返回一个SEL,如果这个方法的名字早已经被注册,那么这个函数只会返回 SEL
OBJC_EXPORT SEL _Nonnull sel_registerName(const char * _Nonnull str)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

((void (*)(id, SEL))(void *)objc_msgSend)((id)self, sel_registerName("testFormat"));

打印:

TestProject[22427:6817642] testFormat

 

object_getClassName
/** 
 * Returns the class name of a given object.
 * 
 * @param obj An Objective-C object.
 * 
 * @return The name of the class of which e obj is an instance.
 */
// 返回这个实例化类的名字
OBJC_EXPORT const char * _Nonnull object_getClassName(id _Nullable obj)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);
 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Windows.Forms;
 5 using Fleck;
 6 
 7 namespace socketService
 8 {
 9 public partial class Form1 : Form
10 {
11 public Form1()
12 {
13 InitializeComponent();
14 CheckForIllegalCrossThreadCalls = false;
15 }
16 
17 private void Form1_Load(object sender, EventArgs e)
18 {
19 //保存所有连接
20 var allSockets = new List<IWebSocketConnection>();
21 //初始化服务端
22 var server = new WebSocketServer("ws://0.0.0.0:8181");
23 //开始监听
24 server.Start(socket =>
25 {
26 //有客户端连接触发
27 socket.OnOpen = () =>
28 {
29 textBox3.Text  = socket.ConnectionInfo.ClientIpAddress   " 连接 rn";
30 allSockets.Add(socket);
31 };
32 //有客户端断开触发
33 socket.OnClose = () =>
34 {
35 textBox3.Text  = socket.ConnectionInfo.ClientIpAddress   " 断开连接 rn";
36 allSockets.Remove(socket);
37 };
38 //接收客户端发送的消息
39 socket.OnMessage = message =>
40 {
41 textBox3.Text  = socket.ConnectionInfo.ClientIpAddress   " 发送了消息:"   message   "rn";
42 //发送接收到的消息给所有客户端
43 allSockets.ToList().ForEach(s => s.Send(message));
44 };
45 });
46 }
47 }
48 }
object_getIndexedIvars
/** 
 * Returns a pointer to any extra bytes allocated with an instance given object.
 * 
 * @param obj An Objective-C object.
 * 
 * @return A pointer to any extra bytes allocated with e obj. If e obj was
 *   not allocated with any extra bytes, then dereferencing the returned pointer is undefined.
 * 
 * @note This function returns a pointer to any extra bytes allocated with the instance
 *  (as specified by c class_createInstance with extraBytes>0). This memory follows the
 *  object's ordinary ivars, but may not be adjacent to the last ivar.
 * @note The returned pointer is guaranteed to be pointer-size aligned, even if the area following
 *  the object's last ivar is less aligned than that. Alignment greater than pointer-size is never
 *  guaranteed, even if the area following the object's last ivar is more aligned than that.
 * @note In a garbage-collected environment, the memory is scanned conservatively.
 */
// 得到一个
OBJC_EXPORT void * _Nullable object_getIndexedIvars(id _Nullable obj)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARC_UNAVAILABLE;

 

sel_getUid
/** 
 * Registers a method name with the Objective-C runtime system.
 * 
 * @param str A pointer to a C string. Pass the name of the method you wish to register.
 * 
 * @return A pointer of type SEL specifying the selector for the named method.
 * 
 * @note The implementation of this method is identical to the implementation of c sel_registerName.
 * @note Prior to OS X version 10.0, this method tried to find the selector mapped to the given name
 *  and returned c NULL if the selector was not found. This was changed for safety, because it was
 *  observed that many of the callers of this function did not check the return value for c NULL.
 */
// 向 runtime系统根据字符串注册一个方法,返回SEL
OBJC_EXPORT SEL _Nonnull sel_getUid(const char * _Nonnull str)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

((void (*)(id, SEL))(void *)objc_msgSend)((id)self, sel_getUid("testFormat"));

打印:

TestProject[22472:6820361] testFormat
sel_isMapped
/** 
 * Identifies a selector as being valid or invalid.
 * 
 * @param sel The selector you want to identify.
 * 
 * @return YES if selector is valid and has a function implementation, NO otherwise. 
 * 
 * @warning On some platforms, an invalid reference (to invalid memory addresses) can cause
 *  a crash. 
 */
// 判断 SEL 是否存在在 SEL Dictionary
OBJC_EXPORT BOOL sel_isMapped(SEL _Nonnull sel)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

SEL sel;
if (sel_isMapped(sel)) {
        NSLog(@"有效");
}

打印:

没有打印

IMP

/// A pointer to the function of a method implementation. 
#if !OBJC_OLD_DISPATCH_PROTOTYPES
typedef void (*IMP)(void /* id, SEL, ... */ ); 
#else
typedef id _Nullable (*IMP)(id _Nonnull, SEL _Nonnull, ...); 
#endif

IMP 指针指向方法的具体的实现

Method

定义
/// An opaque type that represents a method in a class definition.
typedef struct objc_method *Method;
方法
结构
struct objc_method {
    // 方法名字
    SEL _Nonnull method_name                                 OBJC2_UNAVAILABLE;
    // 方法类型
    char * _Nullable method_types                            OBJC2_UNAVAILABLE;
   // 方法指针
    IMP _Nonnull method_imp                                  OBJC2_UNAVAILABLE;
} 

class_replaceMethod

/** 
 * Replaces the implementation of a method for a given class.
 * 
 * @param cls The class you want to modify.
 * @param name A selector that identifies the method whose implementation you want to replace.
 * @param imp The new implementation for the method identified by name for the class identified by cls.
 * @param types An array of characters that describe the types of the arguments to the method. 
 *  Since the function must take at least two arguments—self and _cmd, the second and third characters
 *  must be “@:” (the first character is the return type).
 * 
 * @return The previous implementation of the method identified by e name for the class identified by e cls.
 * 
 * @note This function behaves in two different ways:
 *  - If the method identified by e name does not yet exist, it is added as if c class_addMethod were called. 
 *    The type encoding specified by e types is used as given.
 *  - If the method identified by e name does exist, its c IMP is replaced as if c method_setImplementation were called.
 *    The type encoding specified by e types is ignored.
 */
// 替换给定类方法的实现,如果方法不存在则会调用class_addMethod添加方法。如果方法标识确实存在那么会调用method_setImplementation设置实现
OBJC_EXPORT IMP _Nullable
class_replaceMethod(Class _Nullable cls, SEL _Nonnull name, IMP _Nonnull imp, 
                    const char * _Nullable types) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

class_getInstanceMethod

/** 
 * Returns a specified instance method for a given class.
 * 
 * @param cls The class you want to inspect.
 * @param name The selector of the method you want to retrieve.
 * 
 * @return The method that corresponds to the implementation of the selector specified by 
 *  e name for the class specified by e cls, or c NULL if the specified class or its 
 *  superclasses do not contain an instance method with the specified selector.
 *
 * @note This function searches superclasses for implementations, whereas c class_copyMethodList does not.
 */
 // 获取类的实例化方法
OBJC_EXPORT Method _Nullable
class_getInstanceMethod(Class _Nullable cls, SEL _Nonnull name)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

Method methodI = class_getInstanceMethod([self class], @selector(viewWillAppear:));

打印:

(lldb) po methodI
0x000000010ca31528

class_getClassMethod

/** 
 * Returns a pointer to the data structure describing a given class method for a given class.
 * 
 * @param cls A pointer to a class definition. Pass the class that contains the method you want to retrieve.
 * @param name A pointer of type c SEL. Pass the selector of the method you want to retrieve.
 * 
 * @return A pointer to the c Method data structure that corresponds to the implementation of the 
 *  selector specified by aSelector for the class specified by aClass, or NULL if the specified 
 *  class or its superclasses do not contain an instance method with the specified selector.
 *
 * @note Note that this function searches superclasses for implementations, 
 *  whereas c class_copyMethodList does not.
 */
 // 获取类方法
OBJC_EXPORT Method _Nullable
class_getClassMethod(Class _Nullable cls, SEL _Nonnull name)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

Method method = class_getClassMethod([Person class], @selector(test));

打印:

(lldb) po method
0x0000000106c633d8

class_getMethodImplementation

/** 
 * Returns the function pointer that would be called if a 
 * particular message were sent to an instance of a class.
 * 
 * @param cls The class you want to inspect.
 * @param name A selector.
 * 
 * @return The function pointer that would be called if c [object name] were called
 *  with an instance of the class, or c NULL if e cls is c Nil.
 *
 * @note c class_getMethodImplementation may be faster than c method_getImplementation(class_getInstanceMethod(cls, name)).
 * @note The function pointer returned may be a function internal to the runtime instead of
 *  an actual method implementation. For example, if instances of the class do not respond to
 *  the selector, the function pointer returned will be part of the runtime's message forwarding machinery.
 */
 // 得到指向方法实现的指针
OBJC_EXPORT IMP _Nullable
class_getMethodImplementation(Class _Nullable cls, SEL _Nonnull name) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

IMP imp = class_getMethodImplementation([self class], @selector(viewWillAppear:));

打印:

(lldb) po imp
(UIKit`-[UIViewController viewWillAppear:])

class_getMethodImplementation_stret

/** 
 * Returns the function pointer that would be called if a particular 
 * message were sent to an instance of a class.
 * 
 * @param cls The class you want to inspect.
 * @param name A selector.
 * 
 * @return The function pointer that would be called if c [object name] were called
 *  with an instance of the class, or c NULL if e cls is c Nil.
 */
 // 返回方法的具体的实现
OBJC_EXPORT IMP _Nullable
class_getMethodImplementation_stret(Class _Nullable cls, SEL _Nonnull name) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARM64_UNAVAILABLE;

代码:

打印:

class_respondsToSelector

/** 
 * Returns a Boolean value that indicates whether instances of a class respond to a particular selector.
 * 
 * @param cls The class you want to inspect.
 * @param sel A selector.
 * 
 * @return c YES if instances of the class respond to the selector, otherwise c NO.
 * 
 * @note You should usually use c NSObject's c respondsToSelector: or c instancesRespondToSelector: 
 *  methods instead of this function.
 */
 // 返回一个 Boolean 判断该类是否实现了指定的方法
OBJC_EXPORT BOOL
class_respondsToSelector(Class _Nullable cls, SEL _Nonnull sel) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

BOOL isYES = class_respondsToSelector([self class], @selector(viewWillAppear:));

打印:

(lldb) po isYES
YES

class_copyMethodList

/** 
 * Describes the instance methods implemented by a class.
 * 
 * @param cls The class you want to inspect.
 * @param outCount On return, contains the length of the returned array. 
 *  If outCount is NULL, the length is not returned.
 * 
 * @return An array of pointers of type Method describing the instance methods 
 *  implemented by the class—any instance methods implemented by superclasses are not included. 
 *  The array contains *outCount pointers followed by a NULL terminator. You must free the array with free().
 * 
 *  If cls implements no instance methods, or cls is Nil, returns NULL and *outCount is 0.
 * 
 * @note To get the class methods of a class, use c class_copyMethodList(object_getClass(cls), &count).
 * @note To get the implementations of methods that may be implemented by superclasses, 
 *  use c class_getInstanceMethod or c class_getClassMethod.
 */
 // 得到类的方法列表
OBJC_EXPORT Method _Nonnull * _Nullable
class_copyMethodList(Class _Nullable cls, unsigned int * _Nullable outCount) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

unsigned int count;
Method *methodList = class_copyMethodList([self class], &count);
for (unsigned int i = 0; i < count; i  ) {
    Method method = methodList[I];
    NSLog(@"%s", sel_getName(method_getName(method)));
}

打印:

TestProject[44285:8024690] testFormat
TestProject[44285:8024690] didReceiveMe
TestProject[44285:8024690] viewDidLoad

method_setImplementation

/** 
 * Sets the implementation of a method.
 * 
 * @param m The method for which to set an implementation.
 * @param imp The implemention to set to this method.
 * 
 * @return The previous implementation of the method.
 */
OBJC_EXPORT IMP _Nonnull
method_setImplementation(Method _Nonnull m, IMP _Nonnull imp) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Method m1 = class_getInstanceMethod([TestClass class], @selector(testLog1));
Method m2 = class_getInstanceMethod([TestClass class], @selector(testLog2));
IMP imp1 = method_getImplementation(m1);
IMP imp2 = method_getImplementation(m2);
method_setImplementation(m1, imp2);
method_setImplementation(m2, imp1);

method_exchangeImplementations

Method method1 = class_getInstanceMethod([NSString class], @selector(lowercaseString));
Method method2 = class_getInstanceMethod([NSString class], @selector(uppercaseString));
method_exchangeImplementations(method1, method2);//交换两个方法后,两个方法的功能相反

Ivar

定义
/// An opaque type that represents an instance variable.
typedef struct objc_ivar *Ivar;
结构
struct objc_ivar {
    char * _Nullable ivar_name                               OBJC2_UNAVAILABLE;
    char * _Nullable ivar_type                               OBJC2_UNAVAILABLE;
    int ivar_offset                                          OBJC2_UNAVAILABLE;
#ifdef __LP64__
    int space                                                OBJC2_UNAVAILABLE;
#endif
}
方法
object_getIvar
/** 
 * Reads the value of an instance variable in an object.
 * 
 * @param obj The object containing the instance variable whose value you want to read.
 * @param ivar The Ivar describing the instance variable whose value you want to read.
 * 
 * @return The value of the instance variable specified by e ivar, or c nil if e object is c nil.
 * 
 * @note c object_getIvar is faster than c object_getInstanceVariable if the Ivar
 *  for the instance variable is already known.
 */
1. 读取对象中,实例变量的值
OBJC_EXPORT id _Nullable
object_getIvar(id _Nullable obj, Ivar _Nonnull ivar) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Person *p1 = [[Person alloc] init];
    Ivar ivar = class_getInstanceVariable([p1 class], "_manTest");
    id mantest = object_getIvar(p1, ivar);
    NSLog(@"%@", mantest);

打印:

TestProject[22563:6825947] chen test
object_getInstanceVariable
/** 
 * Obtains the value of an instance variable of a class instance.
 * 
 * @param obj A pointer to an instance of a class. Pass the object containing
 *  the instance variable whose value you wish to obtain.
 * @param name A C string. Pass the name of the instance variable whose value you wish to obtain.
 * @param outValue On return, contains a pointer to the value of the instance variable.
 * 
 * @return A pointer to the c Ivar data structure that defines the type and name of
 *  the instance variable specified by e name.
 */
// 获取实例的实例变量的值
OBJC_EXPORT Ivar _Nullable
object_getInstanceVariable(id _Nullable obj, const char * _Nonnull name,
                           void * _Nullable * _Nullable outValue)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARC_UNAVAILABLE;

代码:

Person *p1 = [[Person alloc] init];
Ivar ivar = class_getInstanceVariable([p1 class], "_manTest");
object_setInstanceVariable
/** 
 * Changes the value of an instance variable of a class instance.
 * 
 * @param obj A pointer to an instance of a class. Pass the object containing
 *  the instance variable whose value you wish to modify.
 * @param name A C string. Pass the name of the instance variable whose value you wish to modify.
 * @param value The new value for the instance variable.
 * 
 * @return A pointer to the c Ivar data structure that defines the type and 
 *  name of the instance variable specified by e name.
 *
 * @note Instance variables with known memory management (such as ARC strong and weak)
 *  use that memory management. Instance variables with unknown memory management 
 *  are assigned as if they were unsafe_unretained.
 */
 //  给类动态的添加一个变量
OBJC_EXPORT Ivar _Nullable
object_setInstanceVariable(id _Nullable obj, const char * _Nonnull name,
                           void * _Nullable value)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARC_UNAVAILABLE;

代码:

Person *p1 = [[Person alloc] init];
object_setInstanceVariableWithStrongDefault(p1, "_manTest", @"shuaibi");
object_setIvar
/** 
 * Sets the value of an instance variable in an object.
 * 
 * @param obj The object containing the instance variable whose value you want to set.
 * @param ivar The Ivar describing the instance variable whose value you want to set.
 * @param value The new value for the instance variable.
 * 
 * @note Instance variables with known memory management (such as ARC strong and weak)
 *  use that memory management. Instance variables with unknown memory management 
 *  are assigned as if they were unsafe_unretained.
 * @note c object_setIvar is faster than c object_setInstanceVariable if the Ivar
 *  for the instance variable is already known.
 */
 // 可以给私有变量设置值 速度超过 object_setInstanceVariable
OBJC_EXPORT void
object_setIvar(id _Nullable obj, Ivar _Nonnull ivar, id _Nullable value) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Person *p1 = [[Person alloc] init];
Ivar ivar = class_getInstanceVariable([p1 class], "_manTest");
object_setIvar(p1, ivar, @"shuaibi");
object_setIvarWithStrongDefault
/** 
 * Sets the value of an instance variable in an object.
 * 
 * @param obj The object containing the instance variable whose value you want to set.
 * @param ivar The Ivar describing the instance variable whose value you want to set.
 * @param value The new value for the instance variable.
 * 
 * @note Instance variables with known memory management (such as ARC strong and weak)
 *  use that memory management. Instance variables with unknown memory management 
 *  are assigned as if they were strong.
 * @note c object_setIvar is faster than c object_setInstanceVariable if the Ivar
 *  for the instance variable is already known.
 */
 // 设置变量中实例变量的值 / iOS 10.0 
OBJC_EXPORT void
object_setIvarWithStrongDefault(id _Nullable obj, Ivar _Nonnull ivar,
                                id _Nullable value) 
    OBJC_AVAILABLE(10.12, 10.0, 10.0, 3.0, 2.0);

代码:

Person *p1 = [[Person alloc] init];
Ivar ivar = class_getInstanceVariable([p1 class], "_manTest");
if (@available(iOS 10.0, *)) {
    object_setIvarWithStrongDefault(p1, ivar, @"chen123");
} else {
    // Fallback on earlier versions
}
object_setInstanceVariableWithStrongDefault
/** 
 * Changes the value of an instance variable of a class instance.
 * 
 * @param obj A pointer to an instance of a class. Pass the object containing
 *  the instance variable whose value you wish to modify.
 * @param name A C string. Pass the name of the instance variable whose value you wish to modify.
 * @param value The new value for the instance variable.
 * 
 * @return A pointer to the c Ivar data structure that defines the type and 
 *  name of the instance variable specified by e name.
 *
 * @note Instance variables with known memory management (such as ARC strong and weak)
 *  use that memory management. Instance variables with unknown memory management 
 *  are assigned as if they were strong.
 */
 // 在MRC环境下使用,更改实例的实例变量的值
OBJC_EXPORT Ivar _Nullable
object_setInstanceVariableWithStrongDefault(id _Nullable obj,
                                            const char * _Nonnull name,
                                            void * _Nullable value)
    OBJC_AVAILABLE(10.12, 10.0, 10.0, 3.0, 2.0)
    OBJC_ARC_UNAVAILABLE;

代码:

Person *p1 = [[Person alloc] init];
Ivar ivar = class_getInstanceVariable([p1 class], "_manTest");
if (@available(iOS 10.0, *)) {
    object_setInstanceVariableWithStrongDefault(p1, "_manTest", @"shuaibi");
} else {
        // Fallback on earlier versions
}
object_getInstanceVariable
/** 
 * Obtains the value of an instance variable of a class instance.
 * 
 * @param obj A pointer to an instance of a class. Pass the object containing
 *  the instance variable whose value you wish to obtain.
 * @param name A C string. Pass the name of the instance variable whose value you wish to obtain.
 * @param outValue On return, contains a pointer to the value of the instance variable.
 * 
 * @return A pointer to the c Ivar data structure that defines the type and name of
 *  the instance variable specified by e name.
 */
 // 获取实例变量的值 MRC 环境下有用
OBJC_EXPORT Ivar _Nullable
object_getInstanceVariable(id _Nullable obj, const char * _Nonnull name,
                           void * _Nullable * _Nullable outValue)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARC_UNAVAILABLE;

代码:

Person *p1 = [[Person alloc] init];
Ivar ivar = object_getInstanceVariable(p1, "_manTest", nil);
NSLog(@" --- %@", object_getIvar(p1, ivar));

打印:

TestProject[22787:6839305]  --- chen test
ivar_getName
/* Working with Instance Variables */

/** 
 * Returns the name of an instance variable.
 * 
 * @param v The instance variable you want to enquire about.
 * 
 * @return A C string containing the instance variable's name.
 */

 // 返回实时变量的名称

OBJC_EXPORT const char * _Nullable
ivar_getName(Ivar _Nonnull v) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Person *p1 = [[Person alloc] init];
Ivar ivar = object_getInstanceVariable(p1, "_manTest", nil);
NSLog(@"%s", ivar_getName(ivar));

打印:

TestProject[22909:6849954] _manTest
ivar_getTypeEncoding
/** 
 * Returns the type string of an instance variable.
 * 
 * @param v The instance variable you want to enquire about.
 * 
 * @return A C string containing the instance variable's type encoding.
 *
 * @note For possible values, see Objective-C Runtime Programming Guide > Type Encodings.
 */
OBJC_EXPORT const char * _Nullable
ivar_getTypeEncoding(Ivar _Nonnull v) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Person *p1 = [[Person alloc] init];
Ivar ivar = object_getInstanceVariable(p1, "_manTest", nil);
NSLog(@"%s", ivar_getTypeEncoding(ivar));

打印:

TestProject[23004:6857088] @"NSString"
ivar_getOffset
/** 
 * Returns the offset of an instance variable.
 * 
 * @param v The instance variable you want to enquire about.
 * 
 * @return The offset of e v.
 * 
 * @note For instance variables of type c id or other object types, call c object_getIvar
 *  and c object_setIvar instead of using this offset to access the instance variable data directly.
 */
 // 得到实例变量的偏移量
OBJC_EXPORT ptrdiff_t
ivar_getOffset(Ivar _Nonnull v) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

Web前端,代码:

Person *p1 = [[Person alloc] init];
Ivar ivar = object_getInstanceVariable(p1, "_manTest", nil);
NSLog(@"%ld", ivar_getOffset(ivar));

打印:

TestProject[23488:6907490] 8

Category

定义

/// An opaque type that represents a category.
typedef struct objc_category *Category;

结构

struct objc_category {
    // 分类名字
    char * _Nonnull category_name                            OBJC2_UNAVAILABLE;
    // 类名
    char * _Nonnull class_name                               OBJC2_UNAVAILABLE;
    // objc 实例方法列表
    struct objc_method_list * _Nullable instance_methods     OBJC2_UNAVAILABLE;
    // objc 类方法列表
    struct objc_method_list * _Nullable class_methods        OBJC2_UNAVAILABLE;
    // 协议列表
    struct objc_protocol_list * _Nullable protocols          OBJC2_UNAVAILABLE;
}                                                            OBJC2_UNAVAILABLE;

objc_property_t

定义

/// An opaque type that represents an Objective-C declared property.
typedef struct objc_property *objc_property_t;

protocol_getProperty

/** 
 * Returns the specified property of a given protocol.
 * 
 * @param proto A protocol.
 * @param name The name of a property.
 * @param isRequiredProperty c YES searches for a required property, c NO searches for an optional property.
 * @param isInstanceProperty c YES searches for an instance property, c NO searches for a class property.
 * 
 * @return The property specified by e name, e isRequiredProperty, and e isInstanceProperty for e proto,
 *  or c NULL if none of e proto's properties meets the specification.
 */
 // 根据协议,属性名字返回一个属性
OBJC_EXPORT objc_property_t _Nullable
protocol_getProperty(Protocol * _Nonnull proto,
                     const char * _Nonnull name,
                     BOOL isRequiredProperty, BOOL isInstanceProperty)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Protocol *protocolA = objc_getProtocol("CatDelegate");
objc_property_t pro = protocol_getProperty(protocolA, "testMark", YES, YES);
NSLog(@"%s", property_getName(pro));

打印:

TestProject[25760:731912] testMark

protocol_copyPropertyList

/** 
 * Returns an array of the required instance properties declared by a protocol.
 * 
 * @note Identical to 
 * code
 * protocol_copyPropertyList2(proto, outCount, YES, YES);
 * endcode
 */
 // 获取一个指定协议的所有的属性,不包括方法
OBJC_EXPORT objc_property_t _Nonnull * _Nullable
protocol_copyPropertyList(Protocol * _Nonnull proto,
                          unsigned int * _Nullable outCount)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Protocol *protocolA = objc_getProtocol("CatDelegate");
unsigned int outCount;
objc_property_t *propertyList = protocol_copyPropertyList(protocolA, &outCount);
for (unsigned int i = 0; i < outCount; i  ) {
    objc_property_t property = propertyList[I];
    NSLog(@"name --- %s", property_getName(property));
}

打印:

TestProject[26269:782402] name --- testMark

protocol_copyPropertyList2

/** 
 * Returns an array of properties declared by a protocol.
 * 
 * @param proto A protocol.
 * @param outCount Upon return, contains the number of elements in the returned array.
 * @param isRequiredProperty c YES returns required properties, c NO returns optional properties.
 * @param isInstanceProperty c YES returns instance properties, c NO returns class properties.
 * 
 * @return A C array of pointers of type c objc_property_t describing the properties declared by e proto.
 *  Any properties declared by other protocols adopted by this protocol are not included. The array contains
 *  c *outCount pointers followed by a c NULL terminator. You must free the array with c free().
 *  If the protocol declares no matching properties, c NULL is returned and c *outCount is c 0.
 */
 // 获取协议的所有的属性,分为required 和 optional。
 这个有点鸡肋我试了 optional 不起作用
OBJC_EXPORT objc_property_t _Nonnull * _Nullable
protocol_copyPropertyList2(Protocol * _Nonnull proto,
                           unsigned int * _Nullable outCount,
                           BOOL isRequiredProperty, BOOL isInstanceProperty)
    OBJC_AVAILABLE(10.12, 10.0, 10.0, 3.0, 2.0);

代码:

Protocol *protocolA = objc_getProtocol("CatDelegate");
unsigned int outCount;
if (@available(iOS 10.0, *)) {
    objc_property_t *propertyList = protocol_copyPropertyList2(protocolA, &outCount, NO, YES);
    for (unsigned int i = 0; i < outCount; i  ) {
        objc_property_t property = propertyList[I];
        NSLog(@"name --- %s", property_getName(property));
    }
} else {
    // Fallback on earlier versions
}

打印:

TestProject[26895:821115] name --- optionalMark
TestProject[26895:821115] name --- testMark

objc_class

结构

struct objc_class {
    Class _Nonnull isa  OBJC_ISA_AVAILABILITY;

#if !__OBJC2__
    Class _Nullable super_class                              OBJC2_UNAVAILABLE;
    const char * _Nonnull name                               OBJC2_UNAVAILABLE;
    long version                                             OBJC2_UNAVAILABLE;
    long info                                                OBJC2_UNAVAILABLE;
    long instance_size                                       OBJC2_UNAVAILABLE;
    struct objc_ivar_list * _Nullable ivars                  OBJC2_UNAVAILABLE;
    struct objc_method_list * _Nullable * _Nullable methodLists                    OBJC2_UNAVAILABLE;
    struct objc_cache * _Nonnull cache                       OBJC2_UNAVAILABLE;
    struct objc_protocol_list * _Nullable protocols          OBJC2_UNAVAILABLE;
#endif

} OBJC2_UNAVAILABLE;

object_copy

/** 
 * Returns a copy of a given object.
 * 
 * @param obj An Objective-C object.
 * @param size The size of the object e obj.
 * 
 * @return A copy of e obj.
 */
// 对象的 copy 属于深 copy
OBJC_EXPORT id _Nullable object_copy(id _Nullable obj, size_t size)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARC_UNAVAILABLE;

代码:

NSLog(@"self --- %p", self);
NSLog(@"object_copy --- %p", object_copy(self, sizeof(self)));

打印:

TestProject[23793:6934176] self --- 0x7f9f8c4049e0
TestProject[23793:6934176] object_copy --- 0x7f9f8c70a1d0

object_dispose

/** 
 * Frees the memory occupied by a given object.
 * 
 * @param obj An Objective-C object.
 * 
 * @return nil
 */
 // 释放给定对象占用的内存
OBJC_EXPORT id _Nullable
object_dispose(id _Nullable obj)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARC_UNAVAILABLE;

代码:

NSLog(@"%@",object_dispose(p1));

打印:

(lldb) po p1
<Person: 0x60000000ec50>

2018-03-09 17:15:38.690 YZTestProject[24032:6953790] (null)
(lldb) po p1
0x000060000000ec50

object_getClass

/** 
 * Returns the class of an object.
 * 
 * @param obj The object you want to inspect.
 * 
 * @return The class object of which e object is an instance, 
 *  or c Nil if e object is c nil.
 */
 //  返回对象的类
OBJC_EXPORT Class _Nullable
object_getClass(id _Nullable obj) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Person *p1 = [[Person alloc] init];
NSLog(@"%@", object_getClass(p1));

打印:

TestProject[24120:6960612] Person
object_setClass
/** 
 * Sets the class of an object.
 * 
 * @param obj The object to modify.
 * @param cls A class object.
 * 
 * @return The previous value of e object's class, or c Nil if e object is c nil.
 */
OBJC_EXPORT Class _Nullable
object_setClass(id _Nullable obj, Class _Nonnull cls) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Person *p1 = [[Person alloc] init];
NSLog(@"n p1 = %@", p1);
Class c1 = object_setClass(p1, [Cat class]);
NSLog(@"n c1 = %@ n p1 = %@", c1, p1);

打印:

TestProject[24490:6987169] 
 p1 = <Person: 0x60000000a580>
TestProject[24490:6987169] 
 c1 = Person 
 p1 = <Cat: 0x60000000a580>
object_isClass
/** 
 * Returns whether an object is a class object.
 * 
 * @param obj An Objective-C object.
 * 
 * @return true if the object is a class or metaclass, false otherwise.
 */
 // 判断是否是一个不为空的类对象
OBJC_EXPORT BOOL
object_isClass(id _Nullable obj)
    OBJC_AVAILABLE(10.10, 8.0, 9.0, 1.0, 2.0);

代码:

BOOL isp1 = object_isClass([p1 class]);
Person * p2;
BOOL isp2 = object_isClass([p2 class]);
NSString * p3 = @"test";
BOOL isp3 = object_isClass([p3 class]);
NSLog(@"%i", isp1);
NSLog(@"%i", isp2);
NSLog(@"%i", isp3);

打印:

TestProject[24619:6998034] 1
TestProject[24619:6998034] 0
TestProject[24619:6998034] 1
objc_getClass
/* Obtaining Class Definitions */

/** 
 * Returns the class definition of a specified class.
 * 
 * @param name The name of the class to look up.
 * 
 * @return The Class object for the named class, or c nil
 *  if the class is not registered with the Objective-C runtime.
 * 
 * @note c objc_getClass is different from c objc_lookUpClass in that if the class
 *  is not registered, c objc_getClass calls the class handler callback and then checks
 *  a second time to see whether the class is registered. c objc_lookUpClass does 
 *  not call the class handler callback.
 * 
 * @warning Earlier implementations of this function (prior to OS X v10.0)
 *  terminate the program if the class does not exist.
 */
OBJC_EXPORT Class _Nullable
objc_getClass(const char * _Nonnull name)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

Cat *cat1 = [[Cat alloc] init];
Class c1 = object_getClass(cat1);
NSLog(@"%@", c1);
NSLog(@"%@", cat1.name);

打印:

TestProject[24927:7020395] Cat
TestProject[24927:7020395] testH
objc_getMetaClass
/** 
 * Returns the metaclass definition of a specified class.
 * 
 * @param name The name of the class to look up.
 * 
 * @return The c Class object for the metaclass of the named class, or c nil if the class
 *  is not registered with the Objective-C runtime.
 * 
 * @note If the definition for the named class is not registered, this function calls the class handler
 *  callback and then checks a second time to see if the class is registered. However, every class
 *  definition must have a valid metaclass definition, and so the metaclass definition is always returned,
 *  whether it’s valid or not.
 */
 // 得到一个类的元类
OBJC_EXPORT Class _Nullable
objc_getMetaClass(const char * _Nonnull name)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

Cat *cat1 = [[Cat alloc] init];
Class c1 = objc_getMetaClass("Cat");
NSLog(@"%@", c1);
NSLog(@"%@", cat1.name);

打印:

TestProject[25712:7077004] Cat
TestProject[25712:7077004] testH
objc_lookUpClass
/** 
 * Returns the class definition of a specified class.
 * 
 * @param name The name of the class to look up.
 * 
 * @return The Class object for the named class, or c nil if the class
 *  is not registered with the Objective-C runtime.
 * 
 * @note c objc_getClass is different from this function in that if the class is not
 *  registered, c objc_getClass calls the class handler callback and then checks a second
 *  time to see whether the class is registered. This function does not call the class handler callback.
 */
 // 获取指定的类,如果没有注册则返回 nil
OBJC_EXPORT Class _Nullable
objc_lookUpClass(const char * _Nonnull name)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

Class cl1 = objc_lookUpClass("Ca");
Class cl2 = objc_lookUpClass("Cat");
objc_getRequiredClass
/** 
 * Returns the class definition of a specified class.
 * 
 * @param name The name of the class to look up.
 * 
 * @return The Class object for the named class.
 * 
 * @note This function is the same as c objc_getClass, but kills the process if the class is not found.
 * @note This function is used by ZeroLink, where failing to find a class would be a compile-time link error without ZeroLink.
 */
 // 获取指定类,如果这个类不存在则崩溃
OBJC_EXPORT Class _Nonnull
objc_getRequiredClass(const char * _Nonnull name)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

Class cl1 = objc_getRequiredClass("Ca");
objc_getClassList
/** 
 * Obtains the list of registered class definitions.
 * 
 * @param buffer An array of c Class values. On output, each c Class value points to
 *  one class definition, up to either e bufferCount or the total number of registered classes,
 *  whichever is less. You can pass c NULL to obtain the total number of registered class
 *  definitions without actually retrieving any class definitions.
 * @param bufferCount An integer value. Pass the number of pointers for which you have allocated space
 *  in e buffer. On return, this function fills in only this number of elements. If this number is less
 *  than the number of registered classes, this function returns an arbitrary subset of the registered classes.
 * 
 * @return An integer value indicating the total number of registered classes.
 * 
 * @note The Objective-C runtime library automatically registers all the classes defined in your source code.
 *  You can create class definitions at runtime and register them with the c objc_addClass function.
 * 
 * @warning You cannot assume that class objects you get from this function are classes that inherit from c NSObject,
 *  so you cannot safely call any methods on such classes without detecting that the method is implemented first.
 */
 // 获取所有已经注册的类
OBJC_EXPORT int
objc_getClassList(Class _Nonnull * _Nullable buffer, int bufferCount)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

Class *bufferClass;
int numClasses;
numClasses = objc_getClassList(NULL, 0);
if(numClasses > 0) {
    bufferClass = (Class *)malloc(sizeof(Class)*numClasses);
    numClasses = objc_getClassList(bufferClass, numClasses);
    NSLog(@"numer of classes: %d", numClasses);
    for (int i = 0; i < numClasses; i  ) {
        Class cls = bufferClass[i];
        NSLog(@"class name: %s", class_getName(cls));
    }
    free(bufferClass);
}

输出结果:

TestProject[41171:7767871] numer of classes: 4739
objc_copyClassList
/** 
 * Creates and returns a list of pointers to all registered class definitions.
 * 
 * @param outCount An integer pointer used to store the number of classes returned by
 *  this function in the list. It can be c nil.
 * 
 * @return A nil terminated array of classes. It must be freed with c free().
 * 
 * @see objc_getClassList
 */
 // 获取所有已经注册的类
OBJC_EXPORT Class _Nonnull * _Nullable
objc_copyClassList(unsigned int * _Nullable outCount)
    OBJC_AVAILABLE(10.7, 3.1, 9.0, 1.0, 2.0);

代码:

unsigned int outCount;
Class *classes = objc_copyClassList(&outCount);
for (int i = 0; i < outCount; i  ) {
    NSLog(@"%s", class_getName(classes[i]));
}

打印:

TestProject[41322:7782252] JSExport
TestProject[41322:7782252] NSLeafProxy
TestProject[41322:7782252] NSProxy
TestProject[41322:7782252] _UITargetedProxy
TestProject[41322:7782252] _UIViewServiceReplyControlTrampoline
class_getName
/* Working with Classes */

/** 
 * Returns the name of a class.
 * 
 * @param cls A class object.
 * 
 * @return The name of the class, or the empty string if e cls is c Nil.
 */
 // 返回一个类的名字
OBJC_EXPORT const char * _Nonnull
class_getName(Class _Nullable cls) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

NSLog(@"%s", class_getName([self class]));

打印:

TestProject[41376:7786142] ViewController
class_isMetaClass
/** 
 * Returns a Boolean value that indicates whether a class object is a metaclass.
 * 
 * @param cls A class object.
 * 
 * @return c YES if e cls is a metaclass, c NO if e cls is a non-meta class, 
 *  c NO if e cls is c Nil.
 */
 // 判断输出的类是否为元类
OBJC_EXPORT BOOL
class_isMetaClass(Class _Nullable cls) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

if (class_isMetaClass(objc_getMetaClass("Cat"))) {
    NSLog(@"YES");
}

打印:

TestProject[41512:7792603] YES
class_getSuperclass
/** 
 * Returns the superclass of a class.
 * 
 * @param cls A class object.
 * 
 * @return The superclass of the class, or c Nil if
 *  e cls is a root class, or c Nil if e cls is c Nil.
 *
 * @note You should usually use c NSObject's c superclass method instead of this function.
 */
 // 得到这个类的父类
OBJC_EXPORT Class _Nullable
class_getSuperclass(Class _Nullable cls) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

NSLog(@"%@", class_getSuperclass([self class]));

打印:

TestProject[41571:7797664] UIViewController
class_setSuperclass
/** 
 * Sets the superclass of a given class.
 * 
 * @param cls The class whose superclass you want to set.
 * @param newSuper The new superclass for cls.
 * 
 * @return The old superclass for cls.
 * 
 * @warning You should not use this function.
 */
 // 给类设置新的父类
OBJC_EXPORT Class _Nonnull
class_setSuperclass(Class _Nonnull cls, Class _Nonnull newSuper) 
    __OSX_DEPRECATED(10.5, 10.5, "not recommended") 
    __IOS_DEPRECATED(2.0, 2.0, "not recommended") 
    __TVOS_DEPRECATED(9.0, 9.0, "not recommended") 
    __WATCHOS_DEPRECATED(1.0, 1.0, "not recommended")
    __BRIDGEOS_DEPRECATED(2.0, 2.0, "not recommended");

代码:

NSLog(@"%@", class_getSuperclass(NSClassFromString(@"ViewController")));
    class_setSuperclass(NSClassFromString(@"ViewController"), NSClassFromString(@"UIImageView"));
    NSLog(@"%@", class_getSuperclass(NSClassFromString(@"ViewController")));

打印:

TestProject[41901:7839232] UIViewController
TestProject[41901:7839232] UIImageView
class_getVersion
/** 
 * Returns the version number of a class definition.
 * 
 * @param cls A pointer to a c Class data structure. Pass
 *  the class definition for which you wish to obtain the version.
 * 
 * @return An integer indicating the version number of the class definition.
 *
 * @see class_setVersion
 */
 // 获取类的版本号  待续...
OBJC_EXPORT int
class_getVersion(Class _Nullable cls)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

NSLog(@"%d", class_getVersion([self class]));

打印:

TestProject[42051:7849333] 0
class_setVersion
/** 
 * Sets the version number of a class definition.
 * 
 * @param cls A pointer to an Class data structure. 
 *  Pass the class definition for which you wish to set the version.
 * @param version An integer. Pass the new version number of the class definition.
 *
 * @note You can use the version number of the class definition to provide versioning of the
 *  interface that your class represents to other classes. This is especially useful for object
 *  serialization (that is, archiving of the object in a flattened form), where it is important to
 *  recognize changes to the layout of the instance variables in different class-definition versions.
 * @note Classes derived from the Foundation framework c NSObject class can set the class-definition
 *  version number using the c setVersion: class method, which is implemented using the c class_setVersion function.
 */
 // 设置类的版本号
OBJC_EXPORT void
class_setVersion(Class _Nullable cls, int version)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

NSLog(@"%d", class_getVersion([self class]));
class_setVersion([self class], 2);
NSLog(@"%d", class_getVersion([self class]));

版本:

TestProject[42247:7871127] 0
TestProject[42247:7871127] 2
class_getInstanceSize
/** 
 * Returns the size of instances of a class.
 * 
 * @param cls A class object.
 * 
 * @return The size in bytes of instances of the class e cls, or c 0 if e cls is c Nil.
 */
 // 返回实例类的大小,以字节为单位
OBJC_EXPORT size_t
class_getInstanceSize(Class _Nullable cls) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

NSLog(@"%ld", class_getInstanceSize([self class]));

打印:

TestProject[42305:7873713] 760
class_getInstanceVariable
/** 
 * Returns the c Ivar for a specified instance variable of a given class.
 * 
 * @param cls The class whose instance variable you wish to obtain.
 * @param name The name of the instance variable definition to obtain.
 * 
 * @return A pointer to an c Ivar data structure containing information about 
 *  the instance variable specified by e name.
 */
OBJC_EXPORT Ivar _Nullable
class_getInstanceVariable(Class _Nullable cls, const char * _Nonnull name)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

代码:

Person *p1 = [[Person alloc] init];
Ivar ivar = class_getInstanceVariable([p1 class], "_manTest");

打印:

(lldb) po ivar
0x00000001098a1460
class_getClassVariable
/** 
 * Returns the Ivar for a specified class variable of a given class.
 * 
 * @param cls The class definition whose class variable you wish to obtain.
 * @param name The name of the class variable definition to obtain.
 * 
 * @return A pointer to an c Ivar data structure containing information about the class variable specified by e name.
 */
 // 获取参数 cls 类的变量名为name的变量

OBJC_EXPORT Ivar _Nullable
class_getClassVariable(Class _Nullable cls, const char * _Nonnull name) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Ivar viewIvar = class_getClassVariable([UIView class], "isa");
id getViewIvar = object_getIvar([UIView class], viewIvar);
NSLog(@"%d", class_isMetaClass(getViewIvar));
NSLog(@"%@", getViewIvar);

打印:

TestProject[42676:7900606] 1
TestProject[42676:7900606] UIView
class_copyIvarList
/** 
 * Describes the instance variables declared by a class.
 * 
 * @param cls The class to inspect.
 * @param outCount On return, contains the length of the returned array. 
 *  If outCount is NULL, the length is not returned.
 * 
 * @return An array of pointers of type Ivar describing the instance variables declared by the class. 
 *  Any instance variables declared by superclasses are not included. The array contains *outCount 
 *  pointers followed by a NULL terminator. You must free the array with free().
 * 
 *  If the class declares no instance variables, or cls is Nil, NULL is returned and *outCount is 0.
 */
 // 一个 Ivar 类型的指针数组,用于描述该类声明的实例变量,必须用free释放该数组
OBJC_EXPORT Ivar _Nonnull * _Nullable
class_copyIvarList(Class _Nullable cls, unsigned int * _Nullable outCount) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

unsigned int count;
Ivar *ivars = class_copyIvarList([Person class], &count);
for (unsigned int i = 0; i < count; i  ) {
    Ivar ivar = ivars[I];
    const char *name = ivar_getName(ivar);
    const char *type = ivar_getTypeEncoding(ivar);
    NSLog(@"类型为%s 的 %s", type, name);

}
free(ivars);

打印:

TestProject[42937:7913951] 类型为@"NSString" 的 _manTest

Protocol

定义:

typedef struct objc_object Protocol;

class_conformsToProtocol

/** 
 * Returns a Boolean value that indicates whether a class conforms to a given protocol.
 * 
 * @param cls The class you want to inspect.
 * @param protocol A protocol.
 *
 * @return YES if cls conforms to protocol, otherwise NO.
 *
 * @note You should usually use NSObject's conformsToProtocol: method instead of this function.
 */
// 返回一个 Boolean 值,检查某个类是否遵从某个协议
OBJC_EXPORT BOOL
class_conformsToProtocol(Class _Nullable cls, Protocol * _Nullable protocol) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Protocol *protocol = NSProtocolFromString(@"UITableViewDataSource");
BOOL isConforms = class_conformsToProtocol([UITableViewController class], protocol);

打印:

(lldb) po isConforms
YES

class_copyProtocolList

/** 
 * Describes the protocols adopted by a class.
 * 
 * @param cls The class you want to inspect.
 * @param outCount On return, contains the length of the returned array. 
 *  If outCount is NULL, the length is not returned.
 * 
 * @return An array of pointers of type Protocol* describing the protocols adopted 
 *  by the class. Any protocols adopted by superclasses or other protocols are not included. 
 *  The array contains *outCount pointers followed by a NULL terminator. You must free the array with free().
 * 
 *  If cls adopts no protocols, or cls is Nil, returns NULL and *outCount is 0.
 */
 // 得到一个类遵守协议的个数
OBJC_EXPORT Protocol * __unsafe_unretained _Nonnull * _Nullable 
class_copyProtocolList(Class _Nullable cls, unsigned int * _Nullable outCount)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

unsigned int count;
Protocol **protocolList = class_copyProtocolList([UITableViewController class], &count);
for (unsigned int i = 0; i < count; i  ) {
    Protocol *pro = protocolList[I];
    NSLog(@"%s", protocol_getName(pro));
}

打印:

TestProject[19640:180921] _UIKeyboardAutoRespondingScrollViewController
TestProject[19640:180921] UITableViewFocusDelegateLegacy
TestProject[19640:180921] UIViewControllerPreviewingDelegate
TestProject[19640:180921] UIViewControllerPreviewingDelegate_Deprecated
TestProject[19640:180921] UITableViewDelegate
TestProject[19640:180921] UITableViewDataSource

objc_getProtocol

/* Working with Protocols */

/** 
 * Returns a specified protocol.
 * 
 * @param name The name of a protocol.
 * 
 * @return The protocol named e name, or c NULL if no protocol named e name could be found.
 * 
 * @note This function acquires the runtime lock.
 */
 // 获取名称为 name 的协议
OBJC_EXPORT Protocol * _Nullable
objc_getProtocol(const char * _Nonnull name)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Protocol *protocol = objc_getProtocol("UITableViewDataSource");

打印:

(lldb) po protocol
<Protocol: 0x107dbf5e0>

objc_copyProtocolList

/** 
 * Returns an array of all the protocols known to the runtime.
 * 
 * @param outCount Upon return, contains the number of protocols in the returned array.
 * 
 * @return A C array of all the protocols known to the runtime. The array contains c *outCount
 *  pointers followed by a c NULL terminator. You must free the list with c free().
 * 
 * @note This function acquires the runtime lock.
 */
 // 返回运行时系统所有的协议
OBJC_EXPORT Protocol * __unsafe_unretained _Nonnull * _Nullable
objc_copyProtocolList(unsigned int * _Nullable outCount)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

unsigned int outCount;
Protocol **protocolList = objc_copyProtocolList(&outCount);
for (unsigned int i = 0; i < outCount; i  ) {
    Protocol *protocol = protocolList[I];
    NSLog(@"%s", protocol_getName(protocol));
}

打印:

TestProject[23401:517412] UIVideoEditorControllerDelegate
TestProject[23401:517412] _UIIVCResponseDelegate
TestProject[23401:517412] _UITouchable
TestProject[23401:517412] WebOpenPanelResultListener
TestProject[23401:517412] SBSRemoteAlertClientHandle
TestProject[23401:517412] _UIContentContainerInternal
TestProject[23401:517412] _UIKeyboardAutoRespondingScrollView
TestProject[23401:517412] CAMLWriterDelegate
TestProject[23401:517412] OS_nw_endpoint_resolver
TestProject[23401:517412] _UIActivityHelperDelegate

protocol_conformsToProtocol

/** 
 * Returns a Boolean value that indicates whether one protocol conforms to another protocol.
 * 
 * @param proto A protocol.
 * @param other A protocol.
 * 
 * @return c YES if e proto conforms to e other, otherwise c NO.
 * 
 * @note One protocol can incorporate other protocols using the same syntax 
 *  that classes use to adopt a protocol:
 *  code
 *  @protocol ProtocolName < protocol list >
 *  endcode
 *  All the protocols listed between angle brackets are considered part of the ProtocolName protocol.
 */
 // 判断一个协议是否遵从了另外一个协议,第一个协议是否遵守了第二个协议
OBJC_EXPORT BOOL
protocol_conformsToProtocol(Protocol * _Nullable proto,
                            Protocol * _Nullable other)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Protocol *tableViewDelegate = objc_getProtocol("UITableViewDelegate");
Protocol *scrollViewDelegate = objc_getProtocol("UIScrollViewDelegate");
BOOL isConform = protocol_conformsToProtocol(tableViewDelegate, scrollViewDelegate);

打印:

(lldb) po isConform
YES
点进去,可以看到第一个协议确实遵守了第二个协议

protocol_isEqual

/** 
 * Returns a Boolean value that indicates whether two protocols are equal.
 * 
 * @param proto A protocol.
 * @param other A protocol.
 * 
 * @return c YES if e proto is the same as e other, otherwise c NO.
 */
 // 判断两个协议是否相等
OBJC_EXPORT BOOL
protocol_isEqual(Protocol * _Nullable proto, Protocol * _Nullable other)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Protocol *protocolA = objc_getProtocol("UITableViewDataSource");
Protocol *protocolB = NSProtocolFromString(@"UITableViewDataSource");
BOOL isEqual = protocol_isEqual(protocolA, protocolB);

打印:

(lldb) po isEqual
YES

protocol_getName

/** 
 * Returns the name of a protocol.
 * 
 * @param p A protocol.
 * 
 * @return The name of the protocol e p as a C string.
 */
 根据协议得到协议的名称
OBJC_EXPORT const char * _Nonnull
protocol_getName(Protocol * _Nonnull proto)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Protocol *protocolA = objc_getProtocol("UITableViewDataSource");
NSLog(@"%s", protocol_getName(protocolA));

打印:

TestProject[23900:551699] UITableViewDataSource

protocol_copyProtocolList

/** 
 * Returns an array of the protocols adopted by a protocol.
 * 
 * @param proto A protocol.
 * @param outCount Upon return, contains the number of elements in the returned array.
 * 
 * @return A C array of protocols adopted by e proto. The array contains e *outCount pointers
 *  followed by a c NULL terminator. You must free the array with c free().
 *  If the protocol declares no properties, c NULL is returned and c *outCount is c 0.
 */
 // 返回协议所遵守的协议,以数组的形式展现
OBJC_EXPORT Protocol * __unsafe_unretained _Nonnull * _Nullable
protocol_copyProtocolList(Protocol * _Nonnull proto,
                          unsigned int * _Nullable outCount)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

Protocol *protocolA = objc_getProtocol("CatDelegate");
unsigned int outCount;
Protocol **protocolList = protocol_copyProtocolList(protocolA, &outCount);
for (unsigned int i = 0; i < outCount; i  ) {
    Protocol *protocol = protocolList[I];
    NSLog(@"name --- %s", protocol_getName(protocol));
}

打印:

TestProject[26997:828030] name --- NSObject

objc_allocateProtocol

/** 
 * Creates a new protocol instance that cannot be used until registered with
 * c objc_registerProtocol()
 * 
 * @param name The name of the protocol to create.
 *
 * @return The Protocol instance on success, c nil if a protocol
 *  with the same name already exists. 
 * @note There is no dispose method for this. 
 */
 // 创建一个新的协议实例,但是需要通过 objc_registerProtocol 注册使用
OBJC_EXPORT Protocol * _Nullable
objc_allocateProtocol(const char * _Nonnull name) 
    OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);

代码:

Protocol *protocol = objc_allocateProtocol("PersonDelegate");

打印:

(lldb) po protocol
<__IncompleteProtocol: 0x6080000a84c0>

objc_registerProtocol

/** 
 * Registers a newly constructed protocol with the runtime. The protocol
 * will be ready for use and is immutable after this.
 * 
 * @param proto The protocol you want to register.
 */
 // 注册协议
OBJC_EXPORT void
objc_registerProtocol(Protocol * _Nonnull proto) 
    OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);

代码:

Protocol *protocol = objc_allocateProtocol("PersonDelegate");
// 声明这个协议还是不可以用的,还是要注册这个协议的
objc_registerProtocol(protocol);

打印:

(lldb) po protocol
<Protocol: 0x6080000a84c0>

protocol_addMethodDescription

/** 
 * Adds a method to a protocol. The protocol must be under construction.
 * 
 * @param proto The protocol to add a method to.
 * @param name The name of the method to add.
 * @param types A C string that represents the method signature.
 * @param isRequiredMethod YES if the method is not an optional method.
 * @param isInstanceMethod YES if the method is an instance method. 
 */
 // 给没有创建的协议添加指定的方法,已经注册的协议无法添加
OBJC_EXPORT void
protocol_addMethodDescription(Protocol * _Nonnull proto, SEL _Nonnull name,
                              const char * _Nullable types,
                              BOOL isRequiredMethod, BOOL isInstanceMethod) 
    OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);

代码:

Protocol *protocolB = objc_allocateProtocol("PersonDelegate");
protocol_addMethodDescription(protocolB, @selector(runtimeTestAction3), "v@:", NO, YES);
unsigned int outCount;
struct objc_method_description *descList = protocol_copyMethodDescriptionList(protocolB, NO, YES, &outCount);
for (unsigned int i = 0; i < outCount; i  ) {
    struct objc_method_description desc = descList[I];
    char *types = desc.types;
    NSLog(@"name: %@, type: %s", NSStringFromSelector(desc.name), types);
}

打印:

TestProject[29062:1027253] name: runtimeTestAction3, type: v@:

protocol_addProtocol

/** 
 * Adds an incorporated protocol to another protocol. The protocol being
 * added to must still be under construction, while the additional protocol
 * must be already constructed.
 * 
 * @param proto The protocol you want to add to, it must be under construction.
 * @param addition The protocol you want to incorporate into e proto, it must be registered.
 */
 // 添加一个已注册的协议到未注册的协议当中
 proto:未注册的协议
 addition:被添加的已注册协议

OBJC_EXPORT void
protocol_addProtocol(Protocol * _Nonnull proto, Protocol * _Nonnull addition) 
    OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);

代码:

// 声明一个协议返回协议的实例
Protocol *protocol = objc_allocateProtocol("ProjectDelegate");
objc_registerProtocol(protocol);   // 协议方法已经注册

Protocol *testProtocol = objc_allocateProtocol("TestProtocol");
protocol_addProtocol(testProtocol, protocol);

// 打印这个协议遵循的协议组
unsigned int count;
Protocol **protocolList = protocol_copyProtocolList(testProtocol, &count);
for (unsigned int i = 0; i < count; i  ) {
    Protocol *protocolC = protocolList[I];
    NSLog(@"name --- %s", protocol_getName(protocolC));
}

打印:

TestProject[32945:1206976] name --- ProjectDelegate

protocol_addProperty

/** 
 * Adds a property to a protocol. The protocol must be under construction. 
 * 
 * @param proto The protocol to add a property to.
 * @param name The name of the property.
 * @param attributes An array of property attributes.
 * @param attributeCount The number of attributes in e attributes.
 * @param isRequiredProperty YES if the property (accessor methods) is not optional. 
 * @param isInstanceProperty YES if the property (accessor methods) are instance methods. 
 *  This is the only case allowed fo a property, as a result, setting this to NO will 
 *  not add the property to the protocol at all. 
 */
 //
OBJC_EXPORT void
protocol_addProperty(Protocol * _Nonnull proto, const char * _Nonnull name,
                     const objc_property_attribute_t * _Nullable attributes,
                     unsigned int attributeCount,
                     BOOL isRequiredProperty, BOOL isInstanceProperty)
    OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);

代码:

    // 创建新的协议
    Protocol *newProtocol = objc_allocateProtocol("DataDelegate");

    // 给一个协议添加一个属性
    objc_property_attribute_t attr_T = {"T", "@"NSString""};   // @encod
    objc_property_attribute_t attr_N = {"N", ""};  // 原子性
    objc_property_attribute_t attr_C = {"C", ""};  // copy
    objc_property_attribute_t attr_V = {"V", "_age"}; // 实例变量
    objc_property_attribute_t attrs[] = {attr_T, attr_N, attr_C, attr_V};
    protocol_addProperty(newProtocol, "age", attrs, 4, YES, YES);

    // 打印协议的属性
    unsigned int outCount;
    objc_property_t *propertyList = protocol_copyPropertyList(newProtocol, &outCount);
    for (unsigned int i = 0; i < outCount; i  ) {
        objc_property_t property = propertyList[I];
        unsigned propertyCount;
        objc_property_attribute_t *attrList = property_copyAttributeList(property, &propertyCount);
        for (unsigned int j  = 0; j < propertyCount; j  ) {
            objc_property_attribute_t attr = attrList[j];
            const char *name = attr.name;
            const char *value = attr.value;
            NSLog(@"name: %s, value: %s", name, value);
        }
    }

打印:

TestProject[33846:1268389] name: T, value: @"NSString"
TestProject[33846:1268389] name: N, value: 
TestProject[33846:1268389] name: C, value: 
TestProject[33846:1268389] name: V, value: _age

objc_method_description

结构:

/// Defines a method
struct objc_method_description {
    SEL _Nullable name;               /**< The name of the method */
    char * _Nullable types;           /**< The types of the method arguments */
};

protocol_getMethodDescription

/** 
 * Returns a method description structure for a specified method of a given protocol.
 * 
 * @param p A protocol.
 * @param aSel A selector.
 * @param isRequiredMethod A Boolean value that indicates whether aSel is a required method.
 * @param isInstanceMethod A Boolean value that indicates whether aSel is an instance method.
 * 
 * @return An c objc_method_description structure that describes the method specified by e aSel,
 *  e isRequiredMethod, and e isInstanceMethod for the protocol e p.
 *  If the protocol does not contain the specified method, returns an c objc_method_description structure
 *  with the value c {NULL, c NULL}.
 * 
 * @note This function recursively searches any protocols that this protocol conforms to.
 */
 // 返回协议中指定方法的描述
OBJC_EXPORT struct objc_method_description
protocol_getMethodDescription(Protocol * _Nonnull proto, SEL _Nonnull aSel,
                              BOOL isRequiredMethod, BOOL isInstanceMethod)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

struct objc_method_description desc = protocol_getMethodDescription(protocolA, @selector(numberOfSectionsInTableView:), NO, YES);

打印:

(lldb) po desc.name
"numberOfSectionsInTableView:"

(lldb) po desc.types
"q24@0:8@16"

protocol_copyMethodDescriptionList

/** 
 * Returns an array of method descriptions of methods meeting a given specification for a given protocol.
 * 
 * @param p A protocol.
 * @param isRequiredMethod A Boolean value that indicates whether returned methods should
 *  be required methods (pass YES to specify required methods).
 * @param isInstanceMethod A Boolean value that indicates whether returned methods should
 *  be instance methods (pass YES to specify instance methods).
 * @param outCount Upon return, contains the number of method description structures in the returned array.
 * 
 * @return A C array of c objc_method_description structures containing the names and types of e p's methods 
 *  specified by e isRequiredMethod and e isInstanceMethod. The array contains c *outCount pointers followed
 *  by a c NULL terminator. You must free the list with c free().
 *  If the protocol declares no methods that meet the specification, c NULL is returned and c *outCount is 0.
 * 
 * @note Methods in other protocols adopted by this protocol are not included.
 */
 // 得到方法描述列表
OBJC_EXPORT struct objc_method_description * _Nullable
protocol_copyMethodDescriptionList(Protocol * _Nonnull proto,
                                   BOOL isRequiredMethod,
                                   BOOL isInstanceMethod,
                                   unsigned int * _Nullable outCount)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

unsigned int outCount;
struct objc_method_description *descList = protocol_copyMethodDescriptionList(protocolA, YES, YES, &outCount);
for (unsigned int i = 0; i < outCount; i  ) {
    struct objc_method_description desc = descList[I];
    char *types = desc.types;
    NSLog(@"name: %@, type: %s", NSStringFromSelector(desc.name), types);
}

打印:

TestProject[25150:681145] name: tableView:numberOfRowsInSection:, type: q32@0:8@16q24
TestProject[25150:681145] name: tableView:cellForRowAtIndexPath:, type: @32@0:8@16@24

objc_property_t

定义:

/// An opaque type that represents an Objective-C declared property.
typedef struct objc_property *objc_property_t;

class_getProperty

/** 
 * Returns a property with a given name of a given class.
 * 
 * @param cls The class you want to inspect.
 * @param name The name of the property you want to inspect.
 * 
 * @return A pointer of type c objc_property_t describing the property, or
 *  c NULL if the class does not declare a property with that name, 
 *  or c NULL if e cls is c Nil.
 */
 // 返回一个属性,通过参数类,和名字
OBJC_EXPORT objc_property_t _Nullable
class_getProperty(Class _Nullable cls, const char * _Nonnull name)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

objc_property_t property_t = class_getProperty([Person class], "age");
const char *name = property_getName(property_t);
NSLog(@"%s", name);

打印:

TestProject[20119:217782] age

class_copyPropertyList

/** 
 * Describes the properties declared by a class.
 * 
 * @param cls The class you want to inspect.
 * @param outCount On return, contains the length of the returned array. 
 *  If e outCount is c NULL, the length is not returned.        
 * 
 * @return An array of pointers of type c objc_property_t describing the properties 
 *  declared by the class. Any properties declared by superclasses are not included. 
 *  The array contains c *outCount pointers followed by a c NULL terminator. You must free the array with c free().
 * 
 *  If e cls declares no properties, or e cls is c Nil, returns c NULL and c *outCount is c 0.
 */
 // 得到类属性列表
OBJC_EXPORT objc_property_t _Nonnull * _Nullable
class_copyPropertyList(Class _Nullable cls, unsigned int * _Nullable outCount)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

unsigned int propertyCount;
objc_property_t *propertyList = class_copyPropertyList([Person class], &propertyCount);
for (unsigned int i = 0; i < propertyCount; i  ) {
    objc_property_t property_t = propertyList[I];
    NSLog(@"%s", property_getName(property_t));
}
free(propertyList);

打印:

TestProject[20198:223479] manTest
TestProject[20198:223479] age

class_getIvarLayout

/** 
 * Returns a description of the c Ivar layout for a given class.
 * 
 * @param cls The class to inspect.
 * 
 * @return A description of the c Ivar layout for e cls.
 */
 // 返回一个类的修饰属性
OBJC_EXPORT const uint8_t * _Nullable
class_getIvarLayout(Class _Nullable cls)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

const uint8_t *array_s = class_getIvarLayout([Person class]);

打印:

(lldb) po array_s
"x01"

class_getWeakIvarLayout

/** 
 * Returns a description of the layout of weak Ivars for a given class.
 * 
 * @param cls The class to inspect.
 * 
 * @return A description of the layout of the weak c Ivars for e cls.
 */
 //  待续
OBJC_EXPORT const uint8_t * _Nullable
class_getWeakIvarLayout(Class _Nullable cls)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

打印:

property_getName

/* Working with Properties */

/** 
 * Returns the name of a property.
 * 
 * @param property The property you want to inquire about.
 * 
 * @return A C string containing the property's name.
 */
 // 返回属性的名字
OBJC_EXPORT const char * _Nonnull
property_getName(objc_property_t _Nonnull property) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

objc_property_t property_t = class_getProperty([Person class], "age");
const char *name = property_getName(property_t);
NSLog(@"%s", name);

打印:

TestProject[21844:408300] age

property_getAttributes

/** 
 * Returns the attribute string of a property.
 * 
 * @param property A property.
 *
 * @return A C string containing the property's attributes.
 * 
 * @note The format of the attribute string is described in Declared Properties in Objective-C Runtime Programming Guide.
 */
 // 返回属性的属性字符串
OBJC_EXPORT const char * _Nullable
property_getAttributes(objc_property_t _Nonnull property) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

id lenderClass = objc_getClass("Person");
unsigned int outCount, I;
objc_property_t *properties = class_copyPropertyList(lenderClass, &outCount);
for (unsigned int i = 0; i < outCount; i  ) {
    objc_property_t property = properties[I];
    fprintf(stdout, "%s %sn", property_getName(property), property_getAttributes(property));
}

打印:

manTest T@"NSString",&,N,V_manTest
age Tq,N,V_age

打印解释:

Web前端 9

image

objc_property_attribute_t

结构:

/// Defines a property attribute
typedef struct {
    const char * _Nonnull name;           /**< The name of the attribute */
    const char * _Nonnull value;          /**< The value of the attribute (usually empty) */
} objc_property_attribute_t;

property_copyAttributeList

/** 
 * Returns an array of property attributes for a property. 
 * 
 * @param property The property whose attributes you want copied.
 * @param outCount The number of attributes returned in the array.
 * 
 * @return An array of property attributes; must be free'd() by the caller. 
 */
 // 返回属性的属性列表值
OBJC_EXPORT objc_property_attribute_t * _Nullable
property_copyAttributeList(objc_property_t _Nonnull property,
                           unsigned int * _Nullable outCount)
    OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);

代码:

id lenderClass = objc_getClass("Person");
unsigned int outCount;
objc_property_t *properties = class_copyPropertyList(lenderClass, &outCount);
for (unsigned int i = 0; i < outCount; i  ) {
    objc_property_t property = properties[I];
    fprintf(stdout, "%s %sn", property_getName(property), property_getAttributes(property));

    unsigned int attrCount = 0;
    objc_property_attribute_t *attrs = property_copyAttributeList(property, &attrCount);
    for (unsigned int j = 0; j < attrCount; j  ) {
        objc_property_attribute_t attr = attrs[j];
        const char *name = attr.name;
        const char *value = attr.value;
        NSLog(@"属性的描述: %s 值: %s", name, value);
    }
}

打印:

manTest T@"NSString",&,N,V_manTest
TestProject[23001:481165] 属性的描述: T 值: @"NSString"
TestProject[23001:481165] 属性的描述: & 值: 
TestProject[23001:481165] 属性的描述: N 值: 
TestProject[23001:481165] 属性的描述: V 值: _manTest

age Tq,N,V_age
TestProject[23001:481165] 属性的描述: T 值: q
TestProject[23001:481165] 属性的描述: N 值: 
TestProject[23001:481165] 属性的描述: V 值: _age

/** 
 * Returns the value of a property attribute given the attribute name.
 * 
 * @param property The property whose attribute value you are interested in.
 * @param attributeName C string representing the attribute name.
 *
 * @return The value string of the attribute e attributeName if it exists in
 *  e property, c nil otherwise. 
 */
 // 通过属性的名字得到属性的值
OBJC_EXPORT char * _Nullable
property_copyAttributeValue(objc_property_t _Nonnull property,
                            const char * _Nonnull attributeName)
    OBJC_AVAILABLE(10.7, 4.3, 9.0, 1.0, 2.0);

代码:

id lenderClass = objc_getClass("Person");
unsigned int outCount;
objc_property_t *properties = class_copyPropertyList(lenderClass, &outCount);
for (unsigned int i = 0; i < outCount; i  ) {
    objc_property_t property = properties[I];
    fprintf(stdout, "%s %sn", property_getName(property), property_getAttributes(property));

    unsigned int attrCount = 0;
    objc_property_attribute_t *attrs = property_copyAttributeList(property, &attrCount);
    for (unsigned int j = 0; j < attrCount; j  ) {
        objc_property_attribute_t attr = attrs[j];
        const char *name = attr.name;
        const char *value = attr.value;
        const char *test = property_copyAttributeValue(property, name);
        NSLog(@"属性的描述: %s 值: %s", name, value);
        NSLog(@"test -- %s", test);
    }
}

打印:

manTest T@"NSString",&,N,V_manTest
TestProject[23099:496137] 属性的描述: T 值: @"NSString"
TestProject[23099:496137] test -- @"NSString"
TestProject[23099:496137] 属性的描述: & 值: 
TestProject[23099:496137] test -- 
TestProject[23099:496137] 属性的描述: N 值: 
TestProject[23099:496137] test -- 
TestProject[23099:496137] 属性的描述: V 值: _manTest
TestProject[23099:496137] test -- _manTest

age Tq,N,V_age
TestProject[23099:496137] 属性的描述: T 值: q
TestProject[23099:496137] test -- q
TestProject[23099:496137] 属性的描述: N 值: 
TestProject[23099:496137] test -- 
TestProject[23099:496137] 属性的描述: V 值: _age
TestProject[23099:496137] test -- _age

动态库

objc_copyImageNames

/* Working with Libraries */

/** 
 * Returns the names of all the loaded Objective-C frameworks and dynamic
 * libraries.
 * 
 * @param outCount The number of names returned.
 * 
 * @return An array of C strings of names. Must be free()'d by caller.
 */
 // 返回所有已加载的 Objective-C 框架和动态库的名称
OBJC_EXPORT const char * _Nonnull * _Nonnull
objc_copyImageNames(unsigned int * _Nullable outCount) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

unsigned int outCount;
const char **nameList = objc_copyImageNames(&outCount);
for (unsigned int i = 0; i < outCount; i  ) {
    const char *name = nameList[I];
    NSLog(@"name : %s", name);
}
free(nameList);

打印:

TestProject[34100:1278609] name : /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 10.2.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/introspection/libdispatch.dylib
TestProject[34100:1278609] name : /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 10.2.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libxpc.dylib
TestProject[34100:1278609] name : /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 10.2.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_trace.dylib
TestProject[34100:1278609] name : /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 10.2.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_network.dylib
TestProject[34100:1278609] name : /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 10.2.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libobjc.A.dylib
TestProject[34100:1278609] name : /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 10.2.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libate.dylib

class_getImageName

/** 
 * Returns the dynamic library name a class originated from.
 * 
 * @param cls The class you are inquiring about.
 * 
 * @return The name of the library containing this class.
 */
 // 返回这个类 源动态库名称
OBJC_EXPORT const char * _Nullable
class_getImageName(Class _Nullable cls) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

代码:

const char *libraryName = class_getImageName([UIViewController class]);
NSLog(@"name: %s", libraryName);

打印:

TestProject[34267:1284976] name: /Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 10.2.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/UIKit.framework/UIKit

objc_copyClassNamesForImage

代码:

unsigned int outCount;
const char **nameList = objc_copyClassNamesForImage("/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 10.2.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/UIKit.framework/UIKit", &outCount);
for (unsigned i = 0; i < outCount; i  ) {
    const char *name = nameList[I];
    NSLog(@"name: %s", name);
}

打印:

部分数据:
TestProject[34509:1304491] name: _UIPreviewPresentationPlatterView
TestProject[34509:1304491] name: UIKeyboardUISettings
TestProject[34509:1304491] name: _UIPickerViewTopFrame
TestProject[34509:1304491] name: _UIOnePartImageView
TestProject[34509:1304491] name: _UIPickerViewSelectionBar
TestProject[34509:1304491] name: _UIPickerWheelView
TestProject[34509:1304491] name: _UIPickerViewTestParameters
TestProject[34509:1304491] name: UIPickerView

objc_setAssociatedObject

/** 
 * Sets an associated value for a given object using a given key and association policy.
 * 
 * @param object The source object for the association.
 * @param key The key for the association.
 * @param value The value to associate with the key key for object. Pass nil to clear an existing association.
 * @param policy The policy for the association. For possible values, see “Associative Object Behaviors.”
 * 
 * @see objc_setAssociatedObject
 * @see objc_removeAssociatedObjects
 */
 // 给已经存在的类添加私有属性,并且设置关联级别
OBJC_EXPORT void
objc_setAssociatedObject(id _Nonnull object, const void * _Nonnull key,
                         id _Nullable value, objc_AssociationPolicy policy)
    OBJC_AVAILABLE(10.6, 3.1, 9.0, 1.0, 2.0);

代码:

UIImage AddProperty.h
#import <UIKit/UIKit.h>
@interface UIImage (AddProperty)
@property(nonatomic,strong)NSString *imageWidth;
@end

UIImage AddProperty.m
#import "UIImage AddProperty.h"
#import <objc/runtime.h>

@implementation UIImage (AddProperty)

-(NSString *)imageWidth{
    return objc_getAssociatedObject(self, _cmd);
}

-(void)setImageWidth:(NSString *)imageWidth{
    objc_setAssociatedObject(self, @selector(imageWidth), imageWidth, OBJC_ASSOCIATION_ASSIGN);
}

@end

objc_getAssociatedObject

/** 
 * Returns the value associated with a given object for a given key.
 * 
 * @param object The source object for the association.
 * @param key The key for the association.
 * 
 * @return The value associated with the key e key for e object.
 * 
 * @see objc_setAssociatedObject
 */
 // 通过对象和 key 得到一个关联值
OBJC_EXPORT id _Nullable
objc_getAssociatedObject(id _Nonnull object, const void * _Nonnull key)
    OBJC_AVAILABLE(10.6, 3.1, 9.0, 1.0, 2.0);

objc_removeAssociatedObjects

/** 
 * Removes all associations for a given object.
 * 
 * @param object An object that maintains associated objects.
 * 
 * @note The main purpose of this function is to make it easy to return an object 
 *  to a "pristine state”. You should not use this function for general removal of
 *  associations from objects, since it also removes associations that other clients
 *  may have added to the object. Typically you should use c objc_setAssociatedObject 
 *  with a nil value to clear an association.
 * 
 * @see objc_setAssociatedObject
 * @see objc_getAssociatedObject
 */
 // 删除给定对象的所有的关联
OBJC_EXPORT void
objc_removeAssociatedObjects(id _Nonnull object)
    OBJC_AVAILABLE(10.6, 3.1, 9.0, 1.0, 2.0);

Class

objc_allocateClassPair

/* Adding Classes */

/** 
 * Creates a new class and metaclass.
 * 
 * @param superclass The class to use as the new class's superclass, or c Nil to create a new root class.
 * @param name The string to use as the new class's name. The string will be copied.
 * @param extraBytes The number of bytes to allocate for indexed ivars at the end of 
 *  the class and metaclass objects. This should usually be c 0.
 * 
 * @return The new class, or Nil if the class could not be created (for example, the desired name is already in use).
 * 
 * @note You can get a pointer to the new metaclass by calling c object_getClass(newClass).
 * @note To create a new class, start by calling c objc_allocateClassPair. 
 *  Then set the class's attributes with functions like c class_addMethod and c class_addIvar.
 *  When you are done building the class, call c objc_registerClassPair. The new class is now ready for use.
 * @note Instance methods and instance variables should be added to the class itself. 
 *  Class methods should be added to the metaclass.
 */
功能:创建一个新的类和这个元类
去创建一个新的类开始通过objc_allocateClassPair,然后设置类的属性和功能用class_addMethod和class_addIvar,实例化方法和实例化变量应该被添加到类本身,类应该添加到元类中。
OBJC_EXPORT Class _Nullable
objc_allocateClassPair(Class _Nullable superclass, const char * _Nonnull name, 
                       size_t extraBytes) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

objc_registerClassPair

/** 
 * Registers a class that was allocated using c objc_allocateClassPair.
 * 
 * @param cls The class you want to register.
 */
// 注册创建的类
OBJC_EXPORT void
objc_registerClassPair(Class _Nonnull cls) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
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