UIPopoverController deprecated in iOS 9.0

I have the next code:

         var imageArray = [UIImage]()
         for photo in self.selectedPhotos {
            imageArray.append(photo.thumbnail!)
         }
        
         let shareScreen = UIActivityViewController(activityItems: imageArray, applicationActivities: nil)
         let navigationItemElement:UIBarButtonItem = (self.navigationItem.rightBarButtonItems?.first)!
         let popover = UIPopoverController(contentViewController: shareScreen)
         popover.presentPopoverFromBarButtonItem(navigationItemElement, permittedArrowDirections: UIPopoverArrowDirection.Any, animated: true)

And I have the next warning:

'UIPopoverController' was deprecated in iOS 9.0: UIPopoverController is deprecated. Popovers are now implementd as UIViewController presentations. Use a modal presentation style of UIModalPresentationPopover and UIPopoverPresentationController.

Anyone has an example?