/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Extends `UIViewController` to add a method to enumerate through a view controller heirarchy.

 */

import UIKit

extension UIViewController {

    /// Executes the specified closure for each of the child and descendant view

    /// controller, as well as for the view controller itself.

    func enumerateHierarchy(_ closure: (UIViewController) -> Void) {

        closure(self)

        for child in childViewControllers {

            child.enumerateHierarchy(closure)

        }

    }

}