title: black screen under transition swift animation
body: <p>I have the following code, when I open the new screen, the old screen turn to black screen
  I need that no have that black screen, just like defualt navigation that is like gray color, thanks</p>
  
  <pre><code>let transition = CATransition()
  transition.duration = 1.0
  transition.type = CATransitionType.moveIn
  transition.subtype = CATransitionSubtype.fromTop
  view.window?.layer.add(transition, forKey: nil)
  viewControllerToPresent.modalPresentationStyle = .overFullScreen
  </code></pre>
  
  <p><a href="https://streamable.com/o033d" rel="nofollow noreferrer">video</a></p>
  
  <p>the last part on the top</p>