title: Black Flickering while Dismissing PopOverViewController
body: <p>I'm getting black flickering screen while dismissing PopOverViewController.</p>
  
  <p>Code in ViewController.swift</p>
  
  <pre><code> if segue.identifier == "addComment"
      {   
                 let controller = segue.destinationViewController as! ProfileCommentPopOver
                  controller.popoverPresentationController?.delegate = self
                  controller.preferredContentSize = CGSizeMake(250, 150)
                 controller.fetchedProfileID = sendToUserID
          }
  </code></pre>
  
  <p>PopOverViewController.swift</p>
  
  <pre><code> @IBAction func addCommentAction(sender: UIButton)
  {
                      self.dismissViewControllerAnimated(true, completion: nil)
  
  }
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/BmnuH.png" alt="Please check screenshot"></p>