创建NSNotificationCenter的子类
@interface MyNotificationCenter : NSNotificationCenter
@end
@implementation MyNotificationCenter
+ (void)load {
Method origin = class_getInstanceMethod([self class],@selector(removeObserver:));
Method current = class_getInstanceMethod([self class],@selector(_removeObserver:));
method_exchangeImplementations(origin, current);
}
- (void)_removeObserver:(id)observer {
NSLog(@"调用移除通知方法: %@",observer);
//[self _removeObserver:observer];
}
@end
当VC被释放时，即使我们不在dealloc中写
-(void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
我们的Log依然会触发，且可以在log中找到vc对象
