[求助]UICollectionView reloadData无法界面

Question

当我调用uicollectionview 的reloadData方法时,界面没用刷新,cellForRowAtIndexPath方法也没调用
当我滚动界面的时候才代理调用cellForRowAtIndexPath方法
用[_collectionView reloadItemsAtIndexPaths:indexPath]也是和reloadData出现的情况一样
请哪位高手对collectionVIew比较熟悉的,帮帮忙...核心代码-(UICollectionViewCell*)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    PCWChatCollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:K_Chat_CollectionCell forIndexPath:indexPath];
        cell.backgroundColor = [UIColor whiteColor];
      
            cell.iconImageView.image = [UIImage imageNamed:@"icon_collectionviewcell_chat"];
            cell.titleLable.text = @"二手车聊天室";
            cell.detailLable.text = @"汇聚全国二手车商交流群";
            cell.enterButton.tag = 1;
            [cell setUnreadCount:[[RCIMClient sharedRCIMClient] getTotalUnreadCount]]
    return cell;
}#pragma  - 融云sdk接受消息回调
-(void)onReceived:(RCMessage *)message left:(int)nLeft object:(id)object
{
    [_collectionView reloadData];
}

Answer 1

2.8版本的kit库，可以这么干
dispatch_async(dispatch_get_main_queue(), ^{
        [ws appendAndDisplayMessage:message];
    });