NavigationStack.swift
	public func navigationController(navigationController: UINavigationController,
    willShowViewController viewController: UIViewController,
    animated: Bool)
	public func navigationController(navigationController: UINavigationController, didShowViewController viewController: UIViewController, animated: Bool)
	public func navigationController(navigationController: UINavigationController, interactionControllerForAnimationController animationController: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning?
	public func navigationController(navigationController: UINavigationController, animationControllerForOperation operation: UINavigationControllerOperation, fromViewController fromVC: UIViewController, toViewController toVC: UIViewController) -> UIViewControllerAnimatedTransitioning?
