UIAlertController处于活动状态时，不会触发VoiceOver Z手势 [英] VoiceOver Z gesture won't trigger when UIAlertController is active

问题描述

我正在尝试使用Z手势关闭UIAlertController.我有一个非常简单的应用程序.它具有1个按钮的单个视图.轻击按钮会发出警报.我已经实现了

I'm trying to use the Z gesture to dismiss a UIAlertController. I have a very simple app. It has a single view with 1 button. Tapping the button presents an alert. I have implemented

- (BOOL)accessibilityPerformEscape {
    NSLog(@"Z gesture");
    return YES;
}

在启用VoiceOver的情况下，擦洗屏幕会打印出"Z手势"，但是当我按下按钮并且看到警报时，擦洗屏幕不会执行任何操作，不会调用该方法，也不会打印任何内容.我该怎么办才能使警报在屏幕上显示出来?

With VoiceOver on, scrubbing the screen prints out "Z gesture," but when I press the button and the alert is visible, scrubbing the screen does nothing, the method is not called and nothing is printed. What do I have to do to get this to function while the alert is on screen?

谢谢...

推荐答案

由于要进行擦洗手势，因此要在警报视图中获得所需的结果，请在警报视图本身中覆盖accessibilityPerformEscape().

To get the desired result on your alert view thanks to the scrub gesture, override accessibilityPerformEscape() in the alert view itself.

解决方案可能是在UIView扩展中实现此替代，如下所示:

A solution could be to implement this override in an UIView extension as follows :

extension UIView {

override open func accessibilityPerformEscape() -> Bool {

    if let myViewController = self.findMyViewController() as? UIAlertController {

        myViewController.dismiss(animated: true,
                                 completion: nil)
    }
    return true
}


private func findMyViewController() -> UIViewController? {

    if let nextResponder = self.next as? UIViewController {
        return nextResponder
    } else if let nextResponder = self.next as? UIView {
        return nextResponder.findMyViewController()
    } else {
        return nil
    }
}

}

该代码足够简短，无需进一步说明即可理解.如果不清楚，请不要犹豫.

The code is short enough to be understood without further explanation. If it's not clear, don't hesitate to ask.

已找到功能findMyViewController 此处.

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