/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    An extension on UINavigationController to return the top view controller's previewActionItems by default.

*/

import UIKit

extension UINavigationController {

    /*

        Override the default implementation of `previewActionItems` to return the

        preview items for the controller's `topViewController`.

    */

    open override var previewActionItems : [UIPreviewActionItem] {

        if let items = self.topViewController?.previewActionItems {

            return items

        }

        else {

            return super.previewActionItems

        }

    }

}