Re-create the Default `UINavigationController` Transition in iOS 10

NavigationParallaxTransition.swift

//
//  NavigationParallaxTransition.swift
//  NavigationTransition
//
//  Created by Stuart Moore on 2/12/17.
//  Copyright © 2017 Stuart J. Moore. All rights reserved.
//

import UIKit

private class NavigationParallaxTransitionTimingCurve: NSObject, UITimingCurveProvider {

    override init() {
        super.init()
    }

    required convenience init?(coder aDecoder: NSCoder) {
        self.init()
    }

    public func copy(with zone: NSZone? = nil) -> Any {
        return NavigationParallaxTransitionTimingCurve()
    }

    public func encode(with aCoder: NSCoder) {
        return
    }

    var timingCurveType: UITimingCurveType {
        return .composed
    }

    var cubicTimingParameters: UICubicTimingParameters? {
        return UICubicTimingParameters(controlPoint1: CGPoint(x: 0.1878, y: 0.0023), controlPoint2: CGPoint(x: 0.5399, y: 0.9629))
    }

    var springTimingParameters: UISpringTimingParameters? {
        return UISpringTimingParameters(mass: 3, stiffness: 1000, damping: 500, initialVelocity: .zero)
    }

}

final class NavigationParallaxTransition: NSObject, UIViewControllerAnimatedTransitioning {

    let duration: TimeInterval = 0.35
    let operation: UINavigationControllerOperation

    init(operation: UINavigationControllerOperation) {
        self.operation = operation
    }

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return duration
    }

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        switch operation {
        case .push:
            animatePushTransition(using: transitionContext)
        case .pop:
            animatePopTransition(using: transitionContext)
        case .none:
            transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
        }
    }

    func animatePushTransition(using transitionContext: UIViewControllerContextTransitioning) {
        guard let toViewController = transitionContext.viewController(forKey: .to),
              let fromViewController = transitionContext.viewController(forKey: .from) else {
            return transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
        }

        let blackOverlayView = UIView(frame: fromViewController.view.frame)
        blackOverlayView.backgroundColor = UIColor.black.withAlphaComponent(0.1)
        blackOverlayView.alpha = 0
        transitionContext.containerView.addSubview(blackOverlayView)

        toViewController.view.frame = transitionContext.finalFrame(for: toViewController)
        toViewController.view.frame.origin.x = toViewController.view.frame.width
        transitionContext.containerView.addSubview(toViewController.view)

        let shadowView = UIImageView(image: #imageLiteral(resourceName: "shadow"))
        shadowView.frame.size = CGSize(width: 6, height: toViewController.view.frame.height)
        shadowView.frame.origin = CGPoint(x: toViewController.view.frame.minX - shadowView.frame.width, y: 0)
        transitionContext.containerView.addSubview(shadowView)

        let timing = NavigationParallaxTransitionTimingCurve()
        let animation = UIViewPropertyAnimator(duration: duration, timingParameters: timing)

        animation.addAnimations {
            blackOverlayView.alpha = 1
            toViewController.view.frame.origin.x = 0
            shadowView.alpha = 0
            shadowView.frame.origin.x = -(shadowView.frame.width)
            fromViewController.view.frame.origin.x = fromViewController.view.frame.width / -4
        }

        animation.addCompletion { _ in
            blackOverlayView.removeFromSuperview()
            shadowView.removeFromSuperview()
            transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
        }

        animation.startAnimation()
    }

    func animatePopTransition(using transitionContext: UIViewControllerContextTransitioning) {
        guard let toViewController = transitionContext.viewController(forKey: .to),
              let fromViewController = transitionContext.viewController(forKey: .from) else {
            return transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
        }

        toViewController.view.frame = transitionContext.finalFrame(for: toViewController)
        toViewController.view.frame.origin.x = toViewController.view.frame.width / -4
        transitionContext.containerView.insertSubview(toViewController.view, at: 0)

        let blackOverlayView = UIView(frame: fromViewController.view.frame)
        blackOverlayView.backgroundColor = UIColor.black.withAlphaComponent(0.1)
        blackOverlayView.alpha = 1
        transitionContext.containerView.insertSubview(blackOverlayView, aboveSubview: toViewController.view)

        let shadowView = UIImageView(image: #imageLiteral(resourceName: "shadow"))
        shadowView.frame.size = CGSize(width: 6, height: toViewController.view.frame.height)
        shadowView.frame.origin = CGPoint(x: -(shadowView.frame.width), y: 0)
        transitionContext.containerView.addSubview(shadowView)

        let timing = NavigationParallaxTransitionTimingCurve()
        let animation = UIViewPropertyAnimator(duration: duration, timingParameters: timing)

        animation.addAnimations {
            blackOverlayView.alpha = 0
            toViewController.view.frame.origin.x = 0
            shadowView.alpha = 0
            shadowView.frame.origin.x = fromViewController.view.frame.width - shadowView.frame.width
            fromViewController.view.frame.origin.x = fromViewController.view.frame.width
        }

        animation.addCompletion { _ in
            blackOverlayView.removeFromSuperview()
            shadowView.removeFromSuperview()
            fromViewController.view.removeFromSuperview()
            transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
        }

        animation.startAnimation()
    }

}