集成环信如何显示未读消息？

// 统计未读消息数
-(void)setupUnreadMessageCount
{
    NSArray *conversations = [[[EaseMob sharedInstance] chatManager] conversations];
    NSInteger unreadCount = 0;
    for (EMConversation *conversation in conversations) {
        unreadCount += conversation.unreadMessagesCount;
    }
    if (_chatListVC) {
        if (unreadCount > 0) {
            _chatListVC.tabBarItem.badgeValue = [NSString stringWithFormat:@"%i",(int)unreadCount];
        }else{
            _chatListVC.tabBarItem.badgeValue = nil;
        }
    }
    
    UIApplication *application = [UIApplication sharedApplication];
    [application setApplicationIconBadgeNumber:unreadCount];
}

 

我的Tabbarcontroller是用storyboard拖的
这种情况怎么搞

现在这个已经有了
就是tabbar item上没有  不显示