iOS 通知传值

    //创建通知 

    NSNotification * notification = [NSNotification notificationWithName:@"tongzhi" object:nil userInfo:nil];

   
//通过通知中心发送通知

    [[NSNotificationCenter defaultCenter]postNotification:notification];

//注册（接收通知）

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

//用完以后移除通知

[[NSNotificationCenter defaultCenter]removeObserver:self name:@"tongzhi" object:nil];