iOS

Question

我有两个视图控制器，B 显示在 A 之上，但不是全屏。我正在使用 UIPresentationController 来自定义 B 的框架。我想要的是，当点击 A 时，B 被取消并且 A 响应它自己的点击手势。

如何在不触及 A 的代码的情况下在 B 和 UIPresentationController 中实现这一点？

我尝试为 B 添加全屏背景视图，但不知道如何在不更改 A 的情况下传递点击手势。

Answer 1

自定义一个背景视图，对于 pointInside 方法始终 return false 以忽略触摸事件并在 return 之前执行任何需要的操作，例如关闭 B。

class BackgroundView: UIView {
    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        // anything you want
        return false
    }
}

将自定义背景视图添加到 UIPresentationController。设置containerView的isUserInteractionEnabled为false，否则UITransitionView会阻塞touch事件向下传递

class MyPresentationController: UIPresentationController {
    var backgroundView: BackgroundView = BackgroundView()
    var containerFrame: CGRect = UIScreen.main.bounds
    
    override var frameOfPresentedViewInContainerView: CGRect {
        return CGRect(x: 0, y: 300, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height - 300)
    }
    
    override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {
        super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
        self.backgroundView.backgroundColor = UIColor.yellow
        self.backgroundView.alpha = 0.5
        self.backgroundView.translatesAutoresizingMaskIntoConstraints = false
    }
    
    override func presentationTransitionWillBegin() {
        self.containerView?.addSubview(self.backgroundView)
        self.containerView?.isUserInteractionEnabled = false // !!!
    }
    
    override func containerViewDidLayoutSubviews() {
        super.containerViewDidLayoutSubviews()
        self.containerView?.frame = self.containerFrame
        self.backgroundView.frame = self.containerFrame
        self.presentedView?.frame = self.frameOfPresentedViewInContainerView
    }
}

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