视图在被呈现后被UITransitionView阻止

Question

我有一个侧面导航控制器,并通过UIButton呈现它.当我直接将这个NC作为根视图控制器时[self presentviewcontroller: NC animated: YES completion: nil],某些原因NC的菜单面被一个UITransitionView我无法消失的东西阻挡.

我附上了一张照片 . 是另一个.

我尝试过以下方法:

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];
                            }
                        }
                    }];

但它非常hacky,并且随着窗口的rootviewcontroller在转换过程中发生变化,它会有点波动,导航控制器的一部分和右上角变黑.看起来很糟糕.

Answer 1

要通过它获取点击事件UITransitionView,请将containerView's 设置userInteractionEnabled为false.这是因为您正在使用自定义过渡动画UIViewControllerAnimatedTransitioning.

例如,在你的animateTransition(_:):

func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

    let containerView = transitionContext.containerView()        
    containerView.userInteractionEnabled = false

    ...
}

Answer 2

在我的情况下，我需要一个 halfSize 视图控制器。我遵循了这个答案，效果很好，直到我意识到我仍然需要能够与呈现的 vc （halfSizeVC 后面的 vc）进行交互。

关键是您必须使用相同的 CGRect 值设置这两个框架：

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)

下面是从ViewController到HalfSizeController并使HalfSizeController成为屏幕尺寸 1/2 的代码。即使在halfSizeVC屏幕上，您仍然可以与其后面的vc 的上半部分进行交互。

PassthroughView如果您希望能够触摸 halfSizeVC 内的某些内容，您还必须创建一个类。我把它放在底部。

呈现的 vc 是白色的，底部有一个紫色按钮。点击紫色按钮将显示红色 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 中的 topHalfDummyView 需要 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
    }
}

按下紫色按钮之前：

按下紫色按钮后：

如果按白色背景，红色将消失

您只需 c+p 所有 3 个文件即可运行您的项目

Answer 3

我遇到了同样的问题，但场景略有不同。我最终做了一些非常类似的事情来查找视图，但我没有删除可能会出现更多问题的视图，而是禁用了用户交互，因此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。

就我而言，只有在将应用程序更新到 iOS 10 后才会出现这种情况，而在 iOS 9 中运行的相同代码则不会出现这种情况。