title: ios UICollectionView cells not refreshing after scroll
body: <p>I have a basic UICollectionView that if I scroll will "redraw" the label on top of the cells,</p>
  
  <p><img src="https://i.stack.imgur.com/W1OeK.png" alt="enter image description here"></p>
  
  <pre><code>- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
  {
  
  
      UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];
  
  
      cell.backgroundColor=[UIColor greenColor];
  
      UILabel *title = [[UILabel alloc]initWithFrame:CGRectMake(0, 10, cell.bounds.size.width, 40)];
      [cell.contentView addSubview:title];
  
      //NSString *titleLbl = [NSString stringWithFormat:@"i = %d", indexPath.row];
  
  
      title.text = [self.arraya objectAtIndex:indexPath.row];
  
      return cell;
  }
  </code></pre>
  
  <p>How to fix it so it refreshes the proper cell after scrolling?
  Cheers</p>