View 在呈现后被 UITransitionView 阻塞 [重复]

问题描述 投票：0回答：6

我有一个侧面导航控制器并通过 UIButton 显示它。当我直接通过

[self presentviewcontroller: NC animated: YES completion: nil]
使这个NC成为根视图控制器时，出于某种原因，NC的菜单侧被我无法消失的
UITransitionView
阻挡。

我试过以下方法：

UIWindow *window = [(AppDelegate *)[[UIApplication sharedApplication] delegate] window];
    window.backgroundColor = kmain;


    CATransition* transition = [CATransition animation];
    transition.duration = .5;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionPush;
    transition.subtype = kCATransitionFromTop;

    [nc.view.layer addAnimation:transition forKey:kCATransition];

    [UIView transitionWithView:window
                      duration:0.5
                       options:UIViewAnimationOptionTransitionNone
                    animations:^{ window.rootViewController = nc; }
                    completion:^(BOOL finished) {
                        for (UIView *subview in window.subviews) {
                            if ([subview isKindOfClass:NSClassFromString(@"UITransitionView")]) {
                                [subview removeFromSuperview];
                            }
                        }
                    }];

但是它非常hacky，并且随着窗口的rootviewcontroller在转换过程中发生变化，它有点不稳定并且部分navigationcontroller和右上角变黑了。看起来很糟糕。

ios uiviewcontroller uinavigationcontroller uiviewanimationtransition catransition
6个回答
8
投票

要通过

UITransitionView
获取点击事件，请将
containerView
的
userInteractionEnabled
设置为
false
。如果您正在使用 
UIViewControllerAnimatedTransitioning
制作自定义过渡动画。

例如，在您的

animateTransition(_:)
中：

func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

    let containerView = transitionContext.containerView
    containerView.isUserInteractionEnabled = false

    ...
}
5
投票

在我的情况下，我需要一个 halfSize 视图控制器。我遵循了this answer which worked great直到我意识到我仍然需要能够与呈现的vc（halfSizeVC背后的vc）进行交互。

关键是你必须用相同的 CGRect 值设置这两个帧：

halfSizeVC.frame = CGRect(x: 0, y: UIScreen.main.bounds.height / 2, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)

containerView = CGRect(x: 0, y: UIScreen.main.bounds.height / 2, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)

这里是从 ViewController 到 HalfSizeController 并使 HalfSizeController 1/2 屏幕尺寸的代码。即使屏幕上有

halfSizeVC
你仍然可以与vc的上半部分互动在它后面.

如果你想能够触摸 halfSizeVC 内部的东西，你还必须创建一个 

PassthroughView
类。我把它放在了底部。

呈现的vc是白色的，底部有一个紫色的按钮。点击紫色按钮将调出红色的 halfSizeVC。

vc/presentingVC:

import UIKit

class ViewController: UIViewController {

    lazy var purpleButton: UIButton = {
        let button = UIButton(type: .system)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setTitle("Tap to Present HalfSizeVC", for: .normal)
        button.setTitleColor(UIColor.white, for: .normal)
        button.backgroundColor = UIColor.systemPurple
        button.addTarget(self, action: #selector(purpleButtonPressed), for: .touchUpInside)
        button.layer.cornerRadius = 7
        button.layer.masksToBounds = true
        return button
    }()

    var halfSizeVC: HalfSizeController?

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white

        // tap gesture on vc will dismiss HalfSizeVC
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(dismissHalfSizeVC))
        view.addGestureRecognizer(tapGesture)
    }


    // tapping the purple button presents HalfSizeVC
    @objc func purpleButtonPressed() {

        halfSizeVC = HalfSizeController()

        // *** IMPORTANT ***
        halfSizeVC!.view.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height / 2)

        halfSizeVC!.modalPresentationStyle = .custom

        present(halfSizeVC!, animated: true, completion: nil)
    }

    // dismiss HalfSizeVC by tapping anywhere on the white background
    @objc func dismissHalfSizeVC() {

        halfSizeVC?.dismissVC()
    }
}

halfSizeVC/presentedVC

import UIKit

class HalfSizeController: UIViewController {

    init() {
        super.init(nibName: nil, bundle: nil)
        modalPresentationStyle = .custom
        transitioningDelegate = self
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    lazy var topHalfDummyView: PassthroughView = {
        let view = PassthroughView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = .clear
        view.isUserInteractionEnabled = true
        return view
    }()

    var isPresenting = false
    let halfScreenHeight = UIScreen.main.bounds.height / 2

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .red

        setAnchors()
    }

    private func setAnchors() {
    
        view.addSubview(topHalfDummyView)
        topHalfDummyView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        topHalfDummyView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        topHalfDummyView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        topHalfDummyView.heightAnchor.constraint(equalToConstant: halfScreenHeight).isActive = true
    }

    public func dismissVC() {
        dismiss(animated: true, completion: nil)
    }
}

extension HalfSizeController: UIViewControllerTransitioningDelegate, UIViewControllerAnimatedTransitioning {

    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 1
    }

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

        let containerView = transitionContext.containerView

        // *** IMPORTANT ***
        containerView.frame = CGRect(x: 0, y: halfScreenHeight, width: UIScreen.main.bounds.width, height: halfScreenHeight)

        let toViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)
        guard let toVC = toViewController else { return }
        isPresenting = !isPresenting

        if isPresenting == true {
            containerView.addSubview(toVC.view)

            topHalfDummyView.frame.origin.y += halfScreenHeight

            UIView.animate(withDuration: 0.4, delay: 0, options: [.curveEaseOut], animations: {

                self.topHalfDummyView.frame.origin.y -= self.halfScreenHeight

            }, completion: { (finished) in
                transitionContext.completeTransition(true)
            })

        } else {
            UIView.animate(withDuration: 0.4, delay: 0, options: [.curveEaseOut], animations: {
            
            }, completion: { (finished) in
                self.topHalfDummyView.frame.origin.y += self.halfScreenHeight
                transitionContext.completeTransition(true)
            })
        }
    }
}

HalfSizeVC 中topHalfDummyView 需要的PassthroughView

import UIKit

class PassthroughView: UIView {
    
    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        print("Passing all touches to the next view (if any), in the view stack.")
        return false
    }
}

在按下紫色按钮之前：

按下紫色按钮后：

如果你按下白色背景，红色将消失

您只需 c+p 所有 3 个文件并运行您的项目

3
投票

我有一个类似的问题，其中 UITransitionView 一直阻止我的视图，阻止任何用户交互。

在我的例子中，这是由于未完成的自定义动画 UIViewController 转换。

我忘记正确完成我的过渡：

TransitionContext.completeTransition(transitionContext.transitionWasCancelled)

或

TransitionContext.completeTransition(!transitionContext.transitionWasCancelled)

在

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {}

来自

UIViewControllerAnimatedTransitioning
协议

1
投票

我遇到了同样的问题，但情况有所不同。我最终做了一些非常相似的事情来找到视图，但我没有删除可能更成问题的视图，而是禁用了用户交互，所以任何触摸事件都会抛出它，任何其他对象都可以处理用户的交互。

在我的例子中，这仅在将应用程序更新到 iOS 10 后出现，而在 iOS 9 中运行的相同代码不属于此。

0
投票

我遇到了同样的问题，这解决了我的问题，

navigationController.setNavigationBarHidden(true, animated: false)

这对我有用，因为我在视图控制器中将自定义视图作为导航栏。

0
投票

我在弹出视图控制器上设置 accessibilityElements 时遇到了这个问题。我通过删除分配元素数组来修复它。

最新问题
© www.soinside.com 2019 - 2024. All rights reserved.