IOS 消息

发送消息：

 NSDictionary *dict=[[NSDictionary alloc]initWithObjectsAndKeys:@"num",[NSString stringWithFormat:@"%d",person.i_Msg], nil];

[[NSNotificationCenter defaultCenter] postNotificationName:@"hideTabBar" object:self userInfo:dict];

接收消息：

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

-(void)hideTabBar:(id)sender
{
    NSString *num=[[sender userInfo] objectForKey:@"num"];
    _numOfmsg = _numOfmsg-[num intValue];
      [self.tabBar showBadgeOnItemIndex:3 andNumber:_numOfmsg];
    if (_numOfmsg==0) {
          [self.tabBar hideBadgeOnItemIndex:3];
    }

}