title: swift present controller with a back button to get back to last screen
body: <p>I am presenting a UICollectionViewController but it just ends up as a controller with no back buttons to get back to the last controller or the home controller, how would i add a back button? or what other options do i have?</p>
  
  <pre><code>class UserProfileController: UICollectionViewController, UICollectionViewDelegateFlowLayout, UserProfileHeaderDelegate, ProfileHeaderClosedDelegate {
  
  
  func presentFRC() {
         let PE = FriendsRequestsController(collectionViewLayout: 
   UICollectionViewFlowLayout())
      let NPE = UINavigationController(rootViewController: PE)
  
      self.present(NPE, animated: true, completion: nil)
  }
  }
  </code></pre>