如何将点击手势添加到变暗的视图背景？

问：

我已经尝试了一段时间。下面的代码是我的 UIPresentationController。当按下一个按钮时，我添加了一个变暗的 UIView，第二个模式 （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单击变暗的 UIView 时没有注册点击手势。

我尝试更改“目标”并在不同的地方添加手势。还查看了其他帖子，但没有任何效果。

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)
    }
}