title: AttributedString on a CollectionView cell is not displaying string value
body: <p>I have a UICollectinViewCell with a label set to attributedString.</p>
  
  <p>Inside cellForItem, I cast a simple string to an NSAttributedString so that I can set the UILabel's attributedText property.</p>
  
  <p>The string <code>"Attributed String Text"</code> only appears if I scroll the CollectionView. If I do not scroll, <code>"Label"</code> appears, as that's the text that is set in IB. If I keep the UILabel as plain, the correct text appears just fine.</p>
  
  <pre><code>// cellForItemAt
  let string = "Attributed String Text"
  let mutableAttributedString = NSAttributedString(string: string)
  cell.subName.attributedText = mutableAttributedString
  </code></pre>
  
  <p><strong>How can I get the attributedText to show without having to scroll the CollectionView?</strong></p>