title: Auto Layout Constraint from UICollectionViewCell to View from ViewController
body: <p>I have UICollectionView which can scroll horizontally. 
  It its cell I would like to add constraint to main view get from ViewController. </p>
  
  <p>Because this is cell of UICollectionView and not his subview, xcode report error that hierarchy is wrong. How to do something like that?</p>
  
  <p>EDIT : </p>
  
  <p>The purpose or effect that I want it is something like that : </p>
  
  <p>I have UICollectionView scrolling horizontal. Cells of this collection view are screen pages. on that screens are labels.
  When user scroll through pages in collection view I would like that label will scroll to the left/right edge of the screen that stay there and disappear with another page. Something like group table view section header but horizontally.</p>
  
  <p><img src="https://i.stack.imgur.com/TuNvx.png" alt="enter image description here"></p>