title: UITableViewCell detailTextLabel disappears when scrolling
body: <p>I'm using an array of strings where I set the <code>detailTextLabel</code> from. Initially all subtitles are set correctly but if I scroll the <code>detailTextLabel</code> disappears.</p>
  
  <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath   *)indexPath {
  
      UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"personCell"  forIndexPath:indexPath];
  
      Person *person = [_persons objectAtIndex:indexPath.row];
      cell.textLabel.text = person.name;
      cell.detailTextLabel.text = person.phone;
  
      // also tried setNeedsLayout but does not help
      [cell setNeedsLayout];
  
      return cell;
  }
  </code></pre>
  
  <p>I'm using an iPhone 6 and iOS 8. I'm also using storyboard and set the <code>UITableViewCell</code> style to <code>Subtitle</code>.</p>