title: Add a view to CollectionView header in StoryBoard
body: <p>I have 2 views on top of my CollectionView and just want to scroll on all these 3 views. I understand the best approach is to place these 2 top views in my collectionView header. How can I achieve this in storyboard (interface builder) without any code?
  (I use this way in my another tableView but I have can't do this with CollectionoView)</p>
  
  <p>I drag those 2 views to my collectionView's reusableView(headerView) and I've faced with this error:
  <a href="https://i.stack.imgur.com/Qjzrr.png" rel="nofollow noreferrer">enter image description here</a></p>