Swift:在当前导航堆栈中实例化视图控制器以进行自定义过渡

简介

我正在创建一个应用程序，该应用程序在其rootviewController中，将UITableView和UIPanGestureRecognizer附加到一个小UIView上，该应用程序充当"句柄"，该应用程序可以从UIViewController的自定义视图控制器过渡，称为" SlideOutViewController"右。

问题

我注意到了两个问题。但是实际的自定义过渡可以按预期进行。

当创建SlideOutViewController时，它没有将其附加到我相信的导航堆栈上，因此它没有关联的Navigationbar。如果我使用 navigationController将其推在堆栈上，我就会松开交互式过渡。
旁注：我尚未找到一种将手柄连接到交互式拖出的SlideOutViewController的方法。因此，手柄的翻译与SlideOutViewControllers位置不一致。

问题

如何将SlideOutViewController添加到导航堆栈中？因此，当我触发UIPanGestureRecognizer？

我的代码

在rootviewController中。

class RootViewController: UIViewController {
    ...
    let slideControllerHandle = UIView()
    var interactionController : UIPercentDrivenInteractiveTransition?
    override func viewDidLoad() {
        super.viewDidLoad()
        ... // Setting up the table view etc...
        setupPanGForSlideOutController()
    }
    private func setupPanGForSlideOutController() {
         slideControllerHandle.translatesAutoresizingMaskIntoConstraints = false
         slideControllerHandle.layer.borderColor = UIColor.black.cgColor
         slideControllerHandle.layer.borderWidth = 1
         slideControllerHandle.layer.cornerRadius = 30
         view.addSubview(slideControllerHandle)
         slideControllerHandle.frame = CGRect(x: view.frame.width - 12.5, y: view.frame.height / 2, width: 25, height: 60)
         let panGestureForCalendar = UIPanGestureRecognizer(target: self, action: #selector(handlePanGestureForSlideOutViewController(_:)))
         slideControllerHandle.addGestureRecognizer(panGestureForCalendar)
    }
    @objc private func handlePanGestureForSlideOutViewController(_ gesture: UIPanGestureRecognizer) {
         let xPosition = gesture.location(in: view).x
         let percent = 1 - (xPosition / view.frame.size.width)
         switch gesture.state {
         case .began:
             guard let slideOutController = storyboard?.instantiateViewController(withIdentifier: "CNSlideOutViewControllerID") as? SlideOutViewController else { fatalError("Sigh...") }
             interactionController = UIPercentDrivenInteractiveTransition()
        slideOutController.customTransitionDelegate.interactionController = interactionController
             self.present(slideOutController, animated: true)
         case .changed:
             slideControllerHandle.center = CGPoint(x: xPosition, y: slideControllerHandle.center.y)
             interactionController?.update(percent)
         case .ended, .cancelled:
             let velocity = gesture.velocity(in: view)
             interactionController?.completionSpeed = 0.999
             if percent > 0.5 || velocity.x < 10 {
                 UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.5, options: .curveEaseInOut, animations: {
                     self.slideControllerHandle.center = CGPoint(x: self.view.frame.width, y: self.slideControllerHandle.center.y)
                 })
                 interactionController?.finish()
             } else {
                 UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.5, options: .curveEaseInOut, animations: {
                     self.slideControllerHandle.center = CGPoint(x: -25, y: self.slideControllerHandle.center.y)
                 })
                 interactionController?.cancel()
             }
             interactionController = nil
         default:
             break
         }
    }

SlideOutViewController

class SlideOutViewController: UIViewController {
    var interactionController : UIPercentDrivenInteractiveTransition?
    let customTransitionDelegate = TransitionDelegate()
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        modalPresentationStyle = .custom
        transitioningDelegate = customTransitionDelegate
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .red
        navigationItem.title = "Slide Controller"
        let addButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addNewData(_:)))
        navigationItem.setRightBarButton(addButton, animated: true)
    }
}

自定义过渡代码。基于Rob对此的描述性答案

transitionDelegate

class TransitioningDelegate: NSObject, UIViewControllerTransitioningDelegate {
    weak var interactionController : UIPercentDrivenInteractiveTransition?
    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return CNRightDragAnimationController(transitionType: .presenting)
    }
    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return CNRightDragAnimationController(transitionType: .dismissing)
    }
    func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
        return PresentationController(presentedViewController: presented, presenting: presenting)
    }
    func interactionControllerForPresentation(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
        return interactionController
    }    
    func interactionControllerForDismissal(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
        return interactionController
    }
}

dragAnimatedTransitioning

class CNRightDragAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
    enum TransitionType {
        case presenting
        case dismissing
    }
    let transitionType: TransitionType
    init(transitionType: TransitionType) {
        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 .presenting:
            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 .dismissing:
            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)
            })
        }
    }
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.5
    }
}

呈现controller

class PresentationController: UIPresentationController {
    override var shouldRemovePresentersView: Bool { return true }
}

感谢您阅读我的问题。

您从中获取的动画代码是定制的"现在"（例如模态）过渡。但是，如果在使用导航控制器时按下/pop时需要自定义导航，则为UINavigationController指定委托，然后返回navigationController(_:animationControllerFor:from:to:)中适当的过渡委托。还可以实现navigationController(_:interactionControllerFor:)并将交互控制器返回。

例如。我会做类似的事情：

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")
        }
    }
}

其中：

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
        }
    }
}

和

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
    }
}

然后，如果第二视图控制器想要具有自定义交互式POP，以及可以滑动到第三视图控制器的能力：

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")
        }
    }
}

但是，如果最后一个视图控制器无法推动任何东西，但只能弹出：

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
    }
}

简介

问题

问题

我的代码

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