title: iOS AlertView above YTPlayerView
body: <p>I have YTPlayerView on my viewController. If i create UIAlertController and show it by method <code>self.present(alertView, animated: true, completion: nil)</code> , alert will be shown under player view. How can i show alertView above all views on my viewController?</p>
  
  <p>Here the code that i use now:</p>
  
  <pre><code>let title = "test alert message" let alert = UIAlertController(title: title, message: nil, preferredStyle: UIAlertControllerStyle.alert)
      alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
      UIApplication.shared.keyWindow?.rootViewController?.present(‌​alert, animated: true, completion: nil)
  </code></pre>