title: Popup UIViewController
body: <p>I'm trying to make a popup which will be presented by pressing a button. Tried to follow instructions which i found in google but my pop view presenting in a full screen and its background is black. 
  Here is my code:</p>
  
  <pre><code>class ViewController: UIViewController, UIPopoverPresentationControllerDelegate {
  
      @IBAction func someButtonPressed(sender: UIButton) {
          let storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
          let popupVC = storyboard.instantiateViewControllerWithIdentifier("hello") as! popupViewController
          popupVC.modalPresentationStyle = .Popover
          popupVC.preferredContentSize = CGSizeMake(300, 300)
          let pVC = popupVC.popoverPresentationController
          pVC?.permittedArrowDirections = .Any
          pVC?.delegate = self
          pVC?.sourceView = sender
          pVC?.sourceRect = CGRect(x: 100, y: 100, width: 1, height: 1)
          presentViewController(popupVC, animated: true, completion: nil)
      }
  }
  </code></pre>
  
  <p>What I'am doing wrong?</p>