UINavigationControllerPaletteClippingView遮挡ImageView致点击关闭失效求助

我之前也踩过iOS 11里这个UINavigationControllerPaletteClippingView抢点击事件的坑！给你几个经过验证的解决思路，按优先级推荐：

1. 把放大视图放到最顶层容器 #

这个是最稳妥的方案，直接绕过遮挡问题。你可以把放大后的ImageView添加到keyWindow（全局最顶层窗口），或者确保它在当前导航控制器视图的最上层：

@objc func enlargeImage(sender: UITapGestureRecognizer) {
    guard let originalImage = (sender.view as? UIImageView)?.image else { return }
    
    // 创建全屏放大的ImageView
    let enlargedImageView = UIImageView(image: originalImage)
    enlargedImageView.frame = UIScreen.main.bounds
    enlargedImageView.contentMode = .scaleAspectFit
    enlargedImageView.isUserInteractionEnabled = true
    
    // 添加关闭点击手势
    let closeTap = UITapGestureRecognizer(target: self, action: #selector(closeEnlargedImage))
    enlargedImageView.addGestureRecognizer(closeTap)
    
    // 关键：添加到keyWindow确保层级最高
    UIApplication.shared.keyWindow?.addSubview(enlargedImageView)
    // 如果你不想用keyWindow，也可以用导航控制器视图并置顶
    // navigationController?.view.addSubview(enlargedImageView)
    // navigationController?.view.bringSubviewToFront(enlargedImageView)
}

@objc func closeEnlargedImage(sender: UITapGestureRecognizer) {
    sender.view?.removeFromSuperview()
}

2. 禁用遮挡视图的用户交互（备选，有审核风险） #

UINavigationControllerPaletteClippingView是系统私有视图，直接操作可能有App Store审核风险，但应急场景下可以试试：

func disablePaletteClippingView() {
    guard let navView = navigationController?.view else { return }
    // 遍历导航控制器子视图找到目标视图
    for subview in navView.subviews {
        if subview.className == "UINavigationControllerPaletteClippingView" {
            subview.isUserInteractionEnabled = false
            break
        }
    }
}

你可以在viewDidAppear(_:)或者触发放大操作前调用这个方法，但要做好审核被拒的心理准备，优先用方案1。

3. 改用全屏背景容器包裹放大视图 #

给放大的ImageView套一个全屏的背景视图，把整个容器加到顶层，这样点击背景也能关闭，同时彻底避开遮挡：

@objc func enlargeImage(sender: UITapGestureRecognizer) {
    guard let originalImage = (sender.view as? UIImageView)?.image else { return }
    
    // 创建全屏背景（可加半透明效果）
    let backgroundView = UIView(frame: UIScreen.main.bounds)
    backgroundView.backgroundColor = UIColor.black.withAlphaComponent(0.8)
    backgroundView.isUserInteractionEnabled = true
    
    // 创建放大ImageView
    let enlargedImageView = UIImageView(image: originalImage)
    enlargedImageView.center = backgroundView.center
    enlargedImageView.contentMode = .scaleAspectFit
    enlargedImageView.isUserInteractionEnabled = true
    
    // 点击背景或图片都关闭
    let closeTap = UITapGestureRecognizer(target: self, action: #selector(closeEnlargedImage))
    backgroundView.addGestureRecognizer(closeTap)
    
    backgroundView.addSubview(enlargedImageView)
    UIApplication.shared.keyWindow?.addSubview(backgroundView)
}

@objc func closeEnlargedImage(sender: UITapGestureRecognizer) {
    sender.view?.removeFromSuperview()
}

为什么iOS 11会出现这个问题？ #

iOS 11中导航控制器新增了UINavigationControllerPaletteClippingView，用来处理导航栏的动态过渡效果，它的视图层级默认会高于你直接添加到当前控制器视图的子视图，所以会拦截点击事件。

内容的提问来源于stack exchange，提问作者rharding