NSNotification--通知传值

 //添加 字典，将label的值通过key值设置传递

    NSDictionary *dict =[[NSDictionary alloc] initWithObjectsAndKeys:[NSString stringWithFormat:@"%d",(int)aBtn.tag],@"aBtn.tag", nil];

    //创建通知

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

    //通过通知中心发送通知

    [[NSNotificationCenter defaultCenter] postNotification:notification];

移除通知：

[[NSNotificationCenter defaultCenter] removeObserver:observer name:nil object:self];

在需要的界面：

  //注册通知

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

- (void)tongzhi:(NSNotification *)puch{

    NSLog(@"%@",puch.userInfo[@"aBtn.tag"]);

    NSLog(@"－－－－－接收到通知------");}

 http://www.cnblogs.com/lmyailgs/p/4460791.html