通知

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1、创建通知(带参数)

[[NSNotificationCenter defaultCenter] postNotificationName:@"BVC" object:nil userInfo:@{@"BVC":@"ZLK"}];

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2、监听通知

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

-(void)get:(NSNotification *)noti{

NSDictionary *dic = noti.userInfo;
NSLog(@"%@",dic[@"BVC"]);

}

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3、一般在监听器销毁之前取消注册（如在监听器中加入下列代码）：

-(void)dealloc {

[[NSNotificationCenter defaultCenter] removeObserver:self];

}