title: Showing pop over from Bar Button in Navigation bar in iPhone
body: <p>In Swift, I'm trying to show a popover from a bar button item present in the top right position of navigation bar. Below is my code:</p>
  
  <pre><code>func showOptions(sender: UIBarButtonItem) {
      let optionsVC = OptionsViewController(nibName: "OptionsViewController", bundle: nil)
      optionsVC.delegate = self
      optionsVC.modalPresentationStyle = .popover
      optionsVC.preferredContentSize = CGSize(width: 200, height: 200)
  
      present(optionsVC, animated: true, completion: nil)
  
      let popController = optionsVC.popoverPresentationController
      popController?.permittedArrowDirections = .up
      popController?.delegate = self
      popController?.barButtonItem = sender
  }
  
  func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -&gt; UIModalPresentationStyle {
      return .none
  }
  </code></pre>
  
  <p>Its working good in iPad and not in iPhone. I've gone through the documentation and different web pages. Everything seems to be right. What's missing in my code?</p>