要通过UITransitionView获取点击事件，请将containerView的userInteractionEnabled设置为false。这是在使用UIViewControllerAnimatedTransitioning进行自定义过渡动画的情况下。
例如，在animateTransition(_:)中：

func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

    let containerView = transitionContext.containerView
    containerView.isUserInteractionEnabled = false

    ...
}

在我的情况下，我需要一个halfSize视图控制器。我遵循this answer which worked great，直到我意识到我仍然需要能够与呈现vc（halfSizeVC背后的vc）交互。
关键是必须使用相同的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)
下面是从 ViewController 到 HalfSizeController 并使 HalfSizeController 成为屏幕大小的1/2的代码。即使屏幕上有halfSizeVC，您仍然可以与其后面的vc的上半部分**交互。
如果你想在halfSizeVC中触摸到一些东西，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，点击紫色按钮会弹出红色的halfSizeVC。
VC/演示VC：

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()
    }
}

半尺寸VC/呈现VC

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需要直通视图

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

我也遇到过类似的问题，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。
我忘记正确完成过渡：

TransitionContext.completeTransition(transitionContext.transitionWasCancelled)

或

TransitionContext.completeTransition(!transitionContext.transitionWasCancelled)

在

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {}

来自UIViewControllerAnimatedTransitioning协议

我遇到了同样的问题，但在一个稍微不同的场景中，我最终做了一些非常相似的事情来找到视图，但我没有删除视图，这可能会更有问题，我禁用了用户交互，所以任何触摸事件都可以抛出它，任何其他对象都可以处理用户的交互。在我的情况下，这只存在于更新应用程序到iOS 10之后。在iOS 9中运行的相同代码不会落入此范围。

我也面临着同样的问题，而这个解决了我的问题，
设置导航栏隐藏（真，动画：错误）
这对我很有效，因为我在视图控制器中有自定义视图作为导航栏。

当我在popover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。