title: <_UIPopoverBackgroundVisualEffectView> is being asked to animate its opacity
body: <p>I am trying to show an (AlertController) Action sheet. But I am getting this waning in console  " &lt;_UIPopoverBackgroundVisualEffectView 0x7fd65ef76ec0> is being asked to animate its opacity. This will cause the effect to appear broken until opacity returns to 1. "        </p>
  
  <p>here is my code :-</p>
  
  <pre><code>extension GroupDataView {
  
    func callDot (sender : UIButton)
    {
        let alert = UIAlertController(title: nil, message: nil,
                                    preferredStyle: .actionSheet)
  
        alert.addAction(UIAlertAction(title: "Edit Group", style: .default , handler:{ (action)in
          print("User click Edit Group")
        }))
  
        alert.addAction(UIAlertAction(title: "Create Folder", style: .default , handler:{ (action)in
          print("User click Create Folder button")
        }))
  
        alert.addAction(UIAlertAction(title: "Delete Group", style: .destructive , handler:{ (action)in
            print("User click Delete Group button")
  
        }))
  
          if let popoverController = alert.popoverPresentationController   {
            popoverController.sourceView = sender
            popoverController.sourceRect = sender.bounds
  
            self.present(alert, animated: true, completion: {
              print("completion block")
            })
         }
  
        else
        {
            self.present(alert, animated: true, completion: {
                print("completion block")
            })
        }
    }
  }  
  </code></pre>
  
  <p>I don't know why this warning is showing in console.
  ActionSheet is coming properly but how to remove that warning?
  Thanks</p>