iOS WKWebView javascript警报崩溃在ipad上 [英] iOS WKWebView javascript alert crashing on ipad

问题描述

我正在使用此答案中的解决方案，该解决方案正确显示了javascript alert / confirm / etc框，并且效果很好在iphone上。

I'm using the solution in this answer that properly displays javascript alert/confirm/etc boxes and it works great on iphones.

func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping () -> Void) {

    let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)
    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        completionHandler()
    }))

    present(alertController, animated: true, completion: nil)
}


func webView(_ webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping (Bool) -> Void) {

    let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)

    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        completionHandler(true)
    }))

    alertController.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
        completionHandler(false)
    }))

    present(alertController, animated: true, completion: nil)
}


func webView(_ webView: WKWebView, runJavaScriptTextInputPanelWithPrompt prompt: String, defaultText: String?, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping (String?) -> Void) {

    let alertController = UIAlertController(title: nil, message: prompt, preferredStyle: .actionSheet)

    alertController.addTextField { (textField) in
        textField.text = defaultText
    }

    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        if let text = alertController.textFields?.first?.text {
            completionHandler(text)
        } else {
            completionHandler(defaultText)
        }
    }))

    alertController.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
        completionHandler(nil)
    }))

    present(alertController, animated: true, completion: nil)
}

但是在ipads上点击任何内容使用javascript操作使应用程序崩溃 [UIPopoverPresentationController presentationTransitionWillBegin]

However on ipads clicking anything with a javascript action crashes the app with [UIPopoverPresentationController presentationTransitionWillBegin]

致命异常：NSGenericException
您的应用程序提供了样式UIAlertControllerStyleActionSheet的UIAlertController（）。具有此样式的UIAlertController的modalPresentationStyle是UIModalPresentationPopover。您必须通过警报控制器的popoverPresentationController为此弹出窗口提供位置信息。您必须提供sourceView和sourceRect或barButtonItem。如果在显示警报控制器时不知道此信息，您可以在UIPopoverPresentationControllerDelegate方法-prepareForPopoverPresentation中提供。

Fatal Exception: NSGenericException Your application has presented a UIAlertController () of style UIAlertControllerStyleActionSheet. The modalPresentationStyle of a UIAlertController with this style is UIModalPresentationPopover. You must provide location information for this popover through the alert controller's popoverPresentationController. You must provide either a sourceView and sourceRect or a barButtonItem. If this information is not known when you present the alert controller, you may provide it in the UIPopoverPresentationControllerDelegate method -prepareForPopoverPresentation.

我是有点不知所措来解决这个问题。任何人都可以就此提出一些建议吗？我已经尝试了各种方法来使用

I'm sort of at a loss here to fix this. Can anyone give some advice on this? I have tried various ways to use

UIPopoverPresentationControllerDelegate方法
-prepareForPopoverPresentation。'

the UIPopoverPresentationControllerDelegate method -prepareForPopoverPresentation.'

在我的代码中，但没有成功。任何建议对此表示赞赏。谢谢。

in my code, but wasn't successful. Any advice appreciated on this. Thanks.

推荐答案

想出这个 - 希望给其他任何人留下一张便条。对函数结尾的一个小改动：

Figured this one out - wanted to leave a note for anyone else that runs in to this. a small change to the end of the functions:

替换

    present(alertController, animated: true, completion: nil)

with

    if let presenter = alertController.popoverPresentationController {
        presenter.sourceView = self.view
    }

    self.present(alertController, animated: true, completion: nil)

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