// Navigation Controller
   transitionalPush(toVC, style: .SlideDown)
   transitionalPop(.SideDown)
   transitionalPopToRoot(.SlideUp)
   transitionalPopToViewController(toVC, style: .SlideUp)

   // Modal Presentation
   transitionalPresentation(toVC, style: .SlideDown)
   transitionalDismissal(.SlideUp)

        fromVC.transitionalCustomDismissal(0.35) { transition in

        // OR

        fromVC.transitionalCustomPresentation(signInVC, duration: 0.35) { transition in
            if let container = transition.containerView,
                bottomVC = transition.bottomViewController,
                topVC = transition.topViewController {

                container.addSubview(bottomVC.view)
                container.addSubview(topVC.view)

                let originalFrame = bottomVC.view.frame
                var endFrame = originalFrame
                var startFrame = originalFrame

                if transition.presenting {
                    startFrame.origin.y -= startFrame.size.height
                } else {
                    endFrame.origin.y -= endFrame.size.height
                }

                topVC.view.frame = startFrame

                UIView.animateWithDuration(transition.duration, animations: {
                    topVC.view.frame = endFrame
                    }) { _ in
                        topVC.view.frame = originalFrame

                        let cancelled = transition.completeTransition()

                        if cancelled {
                            transition.toViewController?.view.removeFromSuperview()
                        } else {
                            transition.fromViewController?.view.removeFromSuperview()
                        }
                }
            }
        }