title: iOS 9 Presenting Popover takes full screen
body: <p>I am trying to present a PopOver view controller, specifically to show a small filters screen next to a TextField. However it is showing as a full-screen view controller. filters_button is the one that should trigger the pop-over. Any ideas why this is showing full screen as if it were a normal ViewController? </p>
  
  <pre><code>func showFilters(){
      let tableViewController = UITableViewController()
      tableViewController.modalPresentationStyle = UIModalPresentationStyle.Popover
      tableViewController.preferredContentSize = CGSizeMake(20, 20)
  
      presentViewController(tableViewController, animated: true, completion: nil)
  
      let popoverPresentationController = tableViewController.popoverPresentationController
      popoverPresentationController?.sourceView = filters_button
      popoverPresentationController?.sourceRect = CGRectMake(0, 0, filters_button.frame.size.width, filters_button.frame.size.height)
  }
  
  func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -&gt; UIModalPresentationStyle {
      return .None
  }
  </code></pre>
  
  <p>Note: At the top of my class I declare that it conforms the "UIPopoverPresentationControllerDelegate" protocol</p>