关于内存警告

UIKIT_EXTERN NSString *const UIApplicationDidReceiveMemoryWarningNotification;

内存警告能够写在

- (void)didReceiveMemoryWarning

{

    

}

方法中，可是在通知中实现效率更高，警告的方法运行顺序在通知之后

[[NSNotificationCenter defaultCenter ]addObserver:self selector:@selector(memoryWarning) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];