Код анимации, из которого вы его взяли, предназначен для пользовательских «настоящих» (например, модальных) переходов.Но если вам нужна настраиваемая навигация при нажатии / выталкивании при использовании контроллера навигации, вы указываете делегата для вашего UINavigationController, а затем возвращаете соответствующий переходящий делегат в navigationController(_:animationControllerFor:from:to:).А также внедрите navigationController(_:interactionControllerFor:) и верните туда свой контроллер взаимодействия.
Например, я бы сделал что-то вроде:
class FirstViewController: UIViewController {
let navigationDelegate = CustomNavigationDelegate()
override func viewDidLoad() {
super.viewDidLoad()
navigationController?.delegate = navigationDelegate
navigationDelegate.addPushInteractionController(to: view)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
navigationDelegate.pushDestination = { [weak self] in
self?.storyboard?.instantiateViewController(withIdentifier: "Second")
}
}
}
Где:
class CustomNavigationDelegate: NSObject, UINavigationControllerDelegate {
var interactionController: UIPercentDrivenInteractiveTransition?
var current: UIViewController?
var pushDestination: (() -> UIViewController?)?
func navigationController(_ navigationController: UINavigationController,
animationControllerFor operation: UINavigationController.Operation,
from fromVC: UIViewController,
to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return CustomNavigationAnimator(transitionType: operation)
}
func navigationController(_ navigationController: UINavigationController,
interactionControllerFor animationController: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
return interactionController
}
func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
current = viewController
}
}
// MARK: - Push
extension CustomNavigationDelegate {
func addPushInteractionController(to view: UIView) {
let swipe = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(handlePushGesture(_:)))
swipe.edges = [.right]
view.addGestureRecognizer(swipe)
}
@objc private func handlePushGesture(_ gesture: UIScreenEdgePanGestureRecognizer) {
guard let pushDestination = pushDestination else { return }
let position = gesture.translation(in: gesture.view)
let percentComplete = min(-position.x / gesture.view!.bounds.width, 1.0)
switch gesture.state {
case .began:
interactionController = UIPercentDrivenInteractiveTransition()
guard let controller = pushDestination() else { fatalError("No push destination") }
current?.navigationController?.pushViewController(controller, animated: true)
case .changed:
interactionController?.update(percentComplete)
case .ended, .cancelled:
let speed = gesture.velocity(in: gesture.view)
if speed.x < 0 || (speed.x == 0 && percentComplete > 0.5) {
interactionController?.finish()
} else {
interactionController?.cancel()
}
interactionController = nil
default:
break
}
}
}
// MARK: - Pop
extension CustomNavigationDelegate {
func addPopInteractionController(to view: UIView) {
let swipe = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(handlePopGesture(_:)))
swipe.edges = [.left]
view.addGestureRecognizer(swipe)
}
@objc private func handlePopGesture(_ gesture: UIScreenEdgePanGestureRecognizer) {
let position = gesture.translation(in: gesture.view)
let percentComplete = min(position.x / gesture.view!.bounds.width, 1)
switch gesture.state {
case .began:
interactionController = UIPercentDrivenInteractiveTransition()
current?.navigationController?.popViewController(animated: true)
case .changed:
interactionController?.update(percentComplete)
case .ended, .cancelled:
let speed = gesture.velocity(in: gesture.view)
if speed.x > 0 || (speed.x == 0 && percentComplete > 0.5) {
interactionController?.finish()
} else {
interactionController?.cancel()
}
interactionController = nil
default:
break
}
}
}
И
class CustomNavigationAnimator: NSObject, UIViewControllerAnimatedTransitioning {
let transitionType: UINavigationController.Operation
init(transitionType: UINavigationController.Operation) {
self.transitionType = transitionType
super.init()
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
let inView = transitionContext.containerView
let toView = transitionContext.view(forKey: .to)!
let fromView = transitionContext.view(forKey: .from)!
var frame = inView.bounds
switch transitionType {
case .push:
frame.origin.x = frame.size.width
toView.frame = frame
inView.addSubview(toView)
UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
toView.frame = inView.bounds
}, completion: { finished in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
})
case .pop:
toView.frame = frame
inView.insertSubview(toView, belowSubview: fromView)
UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
frame.origin.x = frame.size.width
fromView.frame = frame
}, completion: { finished in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
})
case .none:
break
}
}
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.5
}
}
Затем, если второй контроллер представления хотел иметь пользовательское интерактивное всплывающее окно плюс возможность прокрутки к третьему контроллеру представления:
class SecondViewController: UIViewController {
var navigationDelegate: CustomNavigationDelegate { return navigationController!.delegate as! CustomNavigationDelegate }
override func viewDidLoad() {
super.viewDidLoad()
navigationDelegate.addPushInteractionController(to: view)
navigationDelegate.addPopInteractionController(to: view)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
navigationDelegate.pushDestination = { [weak self] in
self?.storyboard?.instantiateViewController(withIdentifier: "Third")
}
}
}
Но если последний контроллер представления не может выдвинуть что-либо, а только pop:
class ThirdViewController: UIViewController {
var navigationDelegate: CustomNavigationDelegate { return navigationController!.delegate as! CustomNavigationDelegate }
override func viewDidLoad() {
super.viewDidLoad()
navigationDelegate.addPopInteractionController(to: view)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
navigationDelegate.pushDestination = nil
}
}