runTime 基本用法

1 获取类名

- (void)fetchClassName {

    constchar* name =class_getName([FirstViewControllerclass]);

    NSString *className = [NSStringstringWithUTF8String:name];

    NSLog(@"className::%@",className);

}

2 获取一个类的变量名称与类型

- (void)fetchIvarList:(Class)cls {

    

    unsignedint count =0;

    Ivar *ivarList =class_copyIvarList(cls, &count);

    for (unsignedint i =0; i<count; i++) {

        constchar * name =ivar_getName(ivarList[i]);

        constchar * type =ivar_getTypeEncoding(ivarList[i]);

        

        NSLog(@"%@ %@",[NSStringstringWithUTF8String:name],[NSStringstringWithUTF8String:type]);

    }

    

   free(ivarList);

}

@property (nonatomic,copy)NSString * name;

打印结果：

[96793:9742178] _name @"NSString"

3 获取属性列表

- (void)fetchIvarProperty:(Class)cls {

    unsignedint count =0;

    objc_property_t * properties =class_copyPropertyList(cls, &count);

    for (unsignedint i =0; i<count; i++) {

        constchar * property =property_getName(properties[i]);

        NSLog(@"%@ ",[NSStringstringWithUTF8String:property]);

    }

    free(properties);

}

@property (nonatomic,assign)NSInteger age;

@property (nonatomic, copy) NSString * name;

打印结果：

2017-03-06 15:56:07.735 runTime[98303:9751944] age 

2017-03-06 15:56:07.735 runTime[98303:9751944] name 

4 获取类的实例方法

- (void)fetchMethodList:(Class)cls {

    unsignedint count =0;

    Method * method =class_copyMethodList(cls, &count);

    for (unsignedint i =0; i<count; i++) {

        SEL  methodName =method_getName(method[i]);

        constchar * types =method_getTypeEncoding(method[i]);

        NSLog(@"%@",[NSStringstringWithUTF8String:methodName]);

        

        

        

    }

    free(method);

    

}

打印结果：

2017-03-06 16:07:19.242 runTime[174:9762872] addMethod

2017-03-06 16:07:19.242 runTime[174:9762872] fetchMethodList:

2017-03-06 16:07:19.242 runTime[174:9762872] test

2017-03-06 16:07:19.243 runTime[174:9762872] fetchClassName

2017-03-06 16:07:19.243 runTime[174:9762872] fetchIvarList:

2017-03-06 16:07:19.243 runTime[174:9762872] fetchIvarProperty:

2017-03-06 16:07:19.243 runTime[174:9762872] age

2017-03-06 16:07:19.244 runTime[174:9762872] setAge:

2017-03-06 16:07:19.244 runTime[174:9762872] .cxx_destruct

2017-03-06 16:07:19.244 runTime[174:9762872] name

2017-03-06 16:07:19.244 runTime[174:9762872] setName:

2017-03-06 16:07:19.245 runTime[174:9762872] didReceiveMemoryWarning

2017-03-06 16:07:19.245 runTime[174:9762872] viewDidLoad

5 获取协议列表

- (void)fetchProtocalList:(Class)cls {

    unsignedint count =0;

  __unsafe_unretained Protocol * *protocols =class_copyProtocolList(cls, &count);

    for (unsignedint i =0; i<count; i++) {

      constchar * name=protocol_getName(protocols[i]);

        NSLog(@"%@",[NSStringstringWithUTF8String:name]);

    }

    free(protocols);

}

 打印结果：

2017-03-06 16:15:47.492 runTime[1595:9771626] UIWebViewDelegate

2017-03-06 16:15:47.492 runTime[1595:9771626] UITextViewDelegate

6 动态的添加方法

- (void)addMethod {

    

    SEL myName =@selector(test);

    Method method =class_getInstanceMethod([selfclass],@selector(test));

    IMP methodIMP =method_getImplementation(method);

    constchar *types =method_getTypeEncoding(method);

    class_addMethod([FirstViewControllerclass], myName, methodIMP, types);

    

}

以上给FirstViewController类添加了一个方法，如下调用

 FirstViewController *vc=[[FirstViewControlleralloc]init];

 [vc performSelector:@selector(test)withObject:nil];

7 方法实现交换

这一点我在博客无码埋点说过，这是实现无码埋点的一个关键点

- (void)methodSwap:(Class)cls MethodOne:(SEL )methodOne MethodTwo:(SEL )methodTwo{

    Method  method1 =class_getInstanceMethod(cls, methodOne);

    Method  method2 =class_getInstanceMethod(cls, methodTwo);

    

    method_exchangeImplementations(method1, method2);

    

}

8 在类别中 为类动态的添加变量

@interface UIViewController (category)

@property(nonatomic,strong)PasswordTextField *passwordTextField;

@end

@implementation UIViewController (category)

-(PasswordTextField *)passwordTextField

{

  return  objc_getAssociatedObject(self,@selector(passwordTextField));

}

-(void)setPasswordTextField:(PasswordTextField *)value

{

    objc_setAssociatedObject(self,@selector(passwordTextField), value,OBJC_ASSOCIATION_RETAIN_NONATOMIC);

}

@end