UITableViewCell的内容从另一个视图控制器添加单元格时不可见

Question

我遇到了一个奇怪的问题，我将UITableViewCell添加到另一个TableViewController的tableView中，该tableView当前不可见但之前已加载。 问题是将单元格添加到tableView，但是一旦我转到该视图控制器，单元格的内容就是空白：

这是添加单元格的方式：

tableView的CellForRowAtIndexPath，其单元格contentView显示为不可见：

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

          LYRConversation *conversation = [_dataSource objectAtIndex:indexPath.row];

          ConversationListCell *cell = (ConversationListCell *)[tableView dequeueReusableCellWithIdentifier:CELL_REUSE_ID forIndexPath:indexPath];

          [self configureCell:cell atIndexPath:indexPath conversation:conversation];

          return cell;

 }

-(void)configureCell:(ConversationListCell *)conversationCell atIndexPath:(NSIndexPath *)indexPath conversation:(LYRConversation *)conversation
{
    [conversationCell updateAvatarWithUrl:[NSURL URLWithString:[self avatarStringUrlForConversation:conversation]]];
    [conversationCell updateTitle:[self titleForConversation:conversation]];
    [conversationCell updateUnreadMessageIndicator:conversation];
    NSArray *otherParticipants = [[PersistentCache sharedCache] cachedUsersForUserIDs:conversation.participants];
    conversationCell.preview.text = [((PFUser *)otherParticipants.lastObject) objectForKey:@"jobTitle"];
    [UIView updateStatusIndicatorOfConversation:otherParticipants statusIndicator:conversationCell.status];
}


-(void)updateAvatarWithUrl:(NSURL *)avatarUrl
{
    if (avatarUrl != nil) {
        downloadImageThenSetForImageView(self.avatar, avatarUrl);
    }
}

-(void)updateTitle:(NSString *)title
{
    self.title.text = title;
}

-(void)updateUnreadMessageIndicator:(LYRConversation *)conversation
{
    if (conversation.lastMessage.isUnread) {
        [_unreadMessageIndicator setImage:[ConversationListCell unreadBlue]];
    }
    else {
        [_unreadMessageIndicator setImage:[ConversationListCell unreadGray]];
    }
}

+(void)updateStatusIndicatorOfConversation:(NSArray<PFUser *> *)users statusIndicator:(UIView *)view
{
    int  statusValue = ((NSNumber *)[users.firstObject objectForKey:@"status"]).intValue;
    if (statusValue == 1) {
        view.backgroundColor = [UIColor PNGInOffice];
    }
    else if(statusValue == 2){
        view.backgroundColor = [UIColor PNGBusy];
    }
    else if(statusValue == 3){
        view.backgroundColor = [UIColor PNGAway];
    }
}

此视图控制器使用故事板中的自动布局进行布局。谢谢！

Answer 1

尝试刷新表视图后，将数据添加到数据源中。

Answer 2

你必须添加此行才能尝试添加  [tableView reloadData];