NSNotificationCenter以及app的几种运行状态

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1~NSNotificationCenter(必须先注册，再发送)

注册通知:即要在什么地方接受消息

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(mytest:) name:@" mytest" object:nil];

[[NSNotificationCenter defaultCenter] postNotificationName:@"mytest"　object:searchFriendArray]；

object：传递的参数

- (void) mytest:(NSNotification*) notification

{

id obj = [notification object];//获取到传递的对象

}

2~移除某个通知

[[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillShowNotificationobject:nil];

3～APP几种运行状态

[[NSNotificationCenterdefaultCenter]addObserver:self selector:@selector(clearMemory)

name:UIApplicationDidReceiveMemoryWarningNotification object:nil];//内存警告

[[NSNotificationCenterdefaultCenter]addObserver:self selector:@selector(cleanDisk) name:UIApplicationWillTerminateNotification object:nil];//APP运行结束

[[NSNotificationCenterdefaultCenter]addObserver:self selector:@selector(backgroundCleanDisk) name:UIApplicationDidEnterBackgroundNotification

object:nil];//退到后台

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