protocol Pop {
    func moveBackToParentViewController(currentViewController: UIViewController)
}

extension Pop {
    func moveBackToParentViewController(currentViewController: UIViewController) {
        
        let transition = CATransition()
        transition.duration = 0.5
        transition.type = kCATransitionMoveIn
        transition.subtype = kCATransitionFromLeft
        
        currentViewController.view.window!.layer.add(transition, forKey: kCATransition)
        
        currentViewController.dismiss(animated: true, completion: nil)
    }
}