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我已经尝试了一段时间。下面的代码是我的 UIPresentationController。当一个按钮被按下时，我添加了一个暗淡的 UIView 并且第二个模态（presentedViewController）在中途弹出。

我在方法presentationTransitionWillBegin() 中添加了点击手势识别器我不知道为什么当我点击变暗的UIView 时没有注册点击手势。

我试过改变“目标”并在不同的地方添加手势。还看了其他帖子，但对我没有任何帮助。

谢谢

import UIKit

class PanModalPresentationController: UIPresentationController {

    override var frameOfPresentedViewInContainerView: CGRect {
        var frame: CGRect = .zero
        frame.size = size(forChildContentContainer: presentedViewController, withParentContainerSize: containerView!.bounds.size)
        frame.origin.y = containerView!.frame.height * (1.0 / 2.0)
        print("frameOfPresentedViewInContainerView")
        return frame
    }

    private lazy var dimView: UIView! = {
        print("dimView")
        guard let container = containerView else { return nil }

        let dimmedView = UIView(frame: container.bounds)
        dimmedView.backgroundColor = UIColor.black.withAlphaComponent(0.5)
        dimmedView.isUserInteractionEnabled = true

        return dimmedView
    }()

    override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {
        print("init presentation controller")
        super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
    }

    override func presentationTransitionWillBegin() {

        guard let container = containerView else { return }
        print("presentation transition will begin")

        container.addSubview(dimView)
        dimView.translatesAutoresizingMaskIntoConstraints = false
        dimView.topAnchor.constraint(equalTo: container.topAnchor).isActive = true
        dimView.leadingAnchor.constraint(equalTo: container.leadingAnchor).isActive = true
        dimView.trailingAnchor.constraint(equalTo: container.trailingAnchor).isActive = true
        dimView.bottomAnchor.constraint(equalTo: container.bottomAnchor).isActive = true
        dimView.isUserInteractionEnabled = true

        let recognizer = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
        dimView.addGestureRecognizer(recognizer)

        container.addSubview(presentedViewController.view)
        presentedViewController.view.translatesAutoresizingMaskIntoConstraints = false
        presentedViewController.view.bottomAnchor.constraint(equalTo: container.bottomAnchor).isActive = true
        presentedViewController.view.widthAnchor.constraint(equalTo: container.widthAnchor).isActive = true
        presentedViewController.view.heightAnchor.constraint(equalTo: container.heightAnchor).isActive = true

        guard let coordinator = presentingViewController.transitionCoordinator else { return }
        coordinator.animate(alongsideTransition: { _ in
            self.dimView.alpha = 1.0
        })

        print(dimView.alpha)
    }

    override func dismissalTransitionWillBegin() {
        guard let coordinator = presentedViewController.transitionCoordinator else {
            print("dismissal coordinator")
            self.dimView.alpha = 0.0
            return
        }
        print("dismissal transition begin")
        coordinator.animate(alongsideTransition: { _ in
            self.dimView.alpha = 0.0
        })
    }

    override func containerViewDidLayoutSubviews() {
        print("containerViewDidLayoutSubviews")
        presentedView?.frame = frameOfPresentedViewInContainerView
//        presentedViewController.dismiss(animated: true, completion: nil)
    }

    override func size(forChildContentContainer container: UIContentContainer, withParentContainerSize parentSize: CGSize) -> CGSize {
        print("size")
        return CGSize(width: parentSize.width, height: parentSize.height * (1.0 / 2.0))
    }

    @objc func handleTap(_ sender: UITapGestureRecognizer) {
        print("tapped")
        //        presentingViewController.dismiss(animated: true, completion: nil)
        presentedViewController.dismiss(animated: true, completion: nil)
    }
}
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5 回答 5

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我不知道您的presentedViewController.view 的框架/边界是什么，但即使它的上半部分的alpha 为0，它也可能覆盖您的dimView 并接收点击事件而不是dimView - 因为presentedViewController.view 添加为dimView 之上的子视图。

于 2020-05-15T18:38:58.400 回答
0

我刚才看了你的项目。问题出在您的动画控制器中。如果您注释掉您的转场委托对象中出售动画控制器的函数，一切正常。

但只要看看你的动画控制器，你想要实现的是让你的新 vc 向上/向下滑动。事实上，您甚至不需要为此定制动画控制器；视图控制器的modalTransitionStyle属性有一个默认值coverVertical，这正是我想要的。

尽管如此，您仍然可以使用我之前发布的演示控制器类，因为它与您的类具有相同的语义，只是没有不必要的覆盖。

可选的

如果您愿意，也只是一个提示，您的项目中现在有这些文件：

PanModalPresentationDelegate.swift
PanModalPresentationController.swift
PanModalPresentationAnimator.swift
TaskViewController.swift
HomeViewController.swift

我通常做的是缩写一些长短语，这样文件和类的名称就可以传达其本质的本质，而无需冗长的样板文件。

所以HomeViewController和TaskViewController会Home_VC和Task_VC。其他3个文件都是为了一个VC的介绍；它会很快失控。所以我通常在那里做的只是调用我的演示控制器PC并将其声明嵌套在将使用它的 VC 类中（在本例中为Task_VC）。直到时间到来，它也需要被其他一些 VC 使用；那么将它放在自己的文件中并调用它更合适，Something_PC但我实际上从未需要这样做，哈哈。对于任何动画控制器都是如此。Fade_AC等Slide_AC。我倾向于调用转换委托 aTransitionManager并将其嵌套在提供的 VC 类中。让我更容易将其视为出售 AC/PC 的东西。

然后你的项目就变成了：

Home_VC.swift
Task_VC.swift

如果你进去Task_VC，你会看到一个嵌套的TransitionManagerand PC。

但是，由你决定。

于 2020-05-16T07:13:43.660 回答
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您可能必须等到控制器出现后，再将手势添加到其父视图的第一个子视图中。我以前用它来关闭带有背景点击的自定义警报控制器。你可能会做类似的事情：

viewController.present(alertController, animated: true) {
     // Enabling Interaction for Transparent Full Screen Overlay
     alertController.view.superview?.subviews.first?.isUserInteractionEnabled = true
     let tapGesture = UITapGestureRecognizer(target: alertController, action: #selector(alertController.dismissSelf))
     alertController.view.superview?.subviews.first?.addGestureRecognizer(tapGesture)
}
于 2020-05-15T18:47:25.820 回答
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嗯，改用这个试试。让我知道事情的后续。这个对我有用。

class PC: UIPresentationController {

    /*
     We'll have a dimming view behind.
     We want to be able to tap anywhere on the dimming view to do a dismissal.
     */

    override var frameOfPresentedViewInContainerView: CGRect {

        let f = super.frameOfPresentedViewInContainerView
        var new = f
        new.size.height /= 2
        new.origin.y = f.midY
        return new
    }

    override func presentationTransitionWillBegin() {

        let con = self.containerView!
        let v = UIView(frame: con.bounds)
        v.backgroundColor = UIColor.black
        v.alpha = 0
        con.insertSubview(v, at: 0)

        let tap = UITapGestureRecognizer(target: self, action: #selector(handleTap))
        v.addGestureRecognizer(tap)

        let tc = self.presentedViewController.transitionCoordinator!
        tc.animate(alongsideTransition: { _ in
            v.alpha = 1
        }, completion: nil)
    }

    @objc func handleTap() {
        print("tapped")
        self.presentedViewController.dismiss(animated: true, completion: nil)
    }

    override func dismissalTransitionWillBegin() {

        let con = self.containerView!
        let v = con.subviews[0]

        let tc = self.presentedViewController.transitionCoordinator!
        tc.animate(alongsideTransition: { _ in
            v.alpha = 0
        }, completion: nil)

    }
}
于 2020-05-15T20:24:32.353 回答
0

dimmedView 位于呈现视图的后面。你有几个选择来纠正这个问题。

首先，是允许触摸通过顶视图，它必须覆盖pointInside：

- (BOOL) pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    for (UIView *subview in self.subviews) {
        if ([subview hitTest:[self convertPoint:point toView:subview] withEvent:event]) {
            return TRUE;
        }
    }

    return FALSE;
}

另一种选择是将手势识别器添加到presentedViewController.view，而不是dimmedView。而且，如果您允许 PanModalPresentationController 采用 UIGestureRecognizerDelegate，并将其作为识别器的委托，您可以通过实现 shouldReceive touch 来确定是否应该响应触摸：

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        if (touch.view == presentedViewController.view) {
            return true
        }
    
        return false
    }

如果您使用第二个选项，请不要忘记在dismissalTransitionWillBegin 或dismissalTransitionDidEnd 中删除手势识别器！

于 2021-06-14T03:10:01.107 回答