title: What does this warning mean: "setting the first responder view of the collection view but we don't know its type (cell/header/footer)"
body: <p>I have a UICollectionView with a UITextView in each cell. When I tap on one of the text views and the keyboard comes up, I get this warning in the output panel:</p>
  
  <p><code>setting the first responder view of the collection view but we don't know its type (cell/header/footer)</code> </p>
  
  <p>Text input works fine, though. However, I'd really like to know what this warning means before I use this code in production.</p>