title: How to add views between UICollectionViewCells in a UICollectionView?
body: <p>I'm trying to add <code>UIView</code>s between my <code>UICollectionViewCell</code>s in my <code>UICollectionView</code> and I don't know how I could do that. I'm trying to accomplish something like this:</p>
  
  <p><img src="https://i.stack.imgur.com/TCnEZ.png" alt="Screenshot"></p>
  
  <p>I'll probably need to write a custom <code>UICollectionViewLayout</code>, but I don't really know where to start.</p>