cocoa之高级开发RunTime高级API

来源：互联网发布：c语言两条竖线运算编辑：程序博客网时间：2024/05/01 05:40

系统类的方法实现部分替换

Method m1 = class_getInstanceMethod([NSStringclass],@selector(lowercaseString));Method m2 = class_getInstanceMethod([NSStringclass],@selector(uppercaseString));method_exchangeImplementations(m1, m2);log list:  (lldb)po [@"assAAAAss" lowercaseString]ASSAAAASS(lldb) po [@"sssKAAAss" uppercaseString]ssskaaass

自定义类的方法实现部分替换

在这里要说到一个黑马的典型死循环（人称自己++自己）

 (void)viewDidLoad {[selfmethodSetImplementation]；[self test];} -(void)test{ [self test];}

如何在不改变源码的基础上干掉死循环

- (void) methodSetImplementation { Method method = class_getInstanceMethod([ViewController class],@selector(justLog1));IMP originalImp = method_getImplementation(method);Method m1 = class_getInstanceMethod([ViewController class],@selector(test)); method_setImplementation(m1, originalImp);}- (void) justLog1 { NSLog(@"justLog1");//完美实现实例方法替换}

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