改写方法

复制代码

1. - (void)applicationDidFinishLaunching:(UIApplication *)application {    
2.     
3.     Method m1 = class_getInstanceMethod([UIApplication class], @selector(didTurnOnDisplay));
4.     Method m2 = class_getInstanceMethod([UIApplication class], @selector(didTurnOffDisplay));
5.     
6.     Method m3 = class_getInstanceMethod([UIApplication class], @selector(handleDidTurnOnDisplay));
7.     Method m4 = class_getInstanceMethod([UIApplication class], @selector(handleDidTurnOffDisplay));
8.     
9.     method_exchangeImplementations(m1, m3);
10.     method_exchangeImplementations(m2, m4);
11.     
12.     [window makeKeyAndVisible];
13. }