Question

请原谅我的新手问题，我是一个非常新的Xamarin开发人员，我不知道Swift，所以Swift中的答案一直没用，因为我还没能将它翻译成C＃。我发现Swift中的一些资源与此问题类似，但我不知道Swift，因此无法将代码转换为xamarin解决方案。我无法在我的应用程序使用的WKWebView中查看的网页中找到任何链接。现在，我可以打开具有“target = _blank”属性的链接，但我无法打开任何其他链接，特别是在当前窗口中打开的链接，以及具有“mailto：”和“tel”属性的链接在URL中。我通过将以下类添加到WebViewController以及ViewDidLoad方法的一行来获得target = _blank链接：

public class NavDelegate : WKUIDelegate
    {

        public override WKWebView CreateWebView(WKWebView webView, WKWebViewConfiguration configuration, WKNavigationAction navigationAction, WKWindowFeatures windowFeatures)
        {
            var url = navigationAction.Request.Url;
            if (navigationAction.TargetFrame == null)
            {
                webView.LoadRequest(navigationAction.Request);
            }


            return null;
        }
    }

以下是添加到ViewDidLoad（）方法的行： WebAppView.UIDelegate = new NavDelegate（）;

完整的ViewDidLoad方法：

public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            WebViewLogo.Owner = this;

            //Check System Version and set WebView accordingly
            //WKWebView only supported on iOS Versions 11+
            if (UIDevice.CurrentDevice.CheckSystemVersion(11, 0))
            {
                View.Frame = new CoreGraphics.CGRect(0, 108, 1024, 611);
                View.AddConstraint(NSLayoutConstraint.Create(View, NSLayoutAttribute.Height, NSLayoutRelation.Equal, View, NSLayoutAttribute.Height, 1.0f, 0.0f));
                View.AddConstraint(NSLayoutConstraint.Create(View, NSLayoutAttribute.Width, NSLayoutRelation.Equal, View, NSLayoutAttribute.Width, 1.0f, 0.0f));
                View.AddConstraint(NSLayoutConstraint.Create(View, NSLayoutAttribute.Trailing, NSLayoutRelation.Equal, View, NSLayoutAttribute.Trailing, 1.0f, 0.0f));
                View.AddConstraint(NSLayoutConstraint.Create(View, NSLayoutAttribute.Bottom, NSLayoutRelation.Equal, View, NSLayoutAttribute.Bottom, 1.0f, 43.0f));

                var WebAppView = new WKWebView(View.Frame, new WKWebViewConfiguration());
                WebAppView.UIDelegate = new NavDelegate();
                View.AddSubview(WebAppView);
                //set the margins and constraints


                // Add a tap recognizer to reset timer
                var actionGestureRecognizer = new UITapGestureRecognizer(this, new ObjCRuntime.Selector("HandleActionEvent:"));
                actionGestureRecognizer.NumberOfTapsRequired = 1;
                actionGestureRecognizer.Delegate = new GestureDelegate();
                WebAppView.AddGestureRecognizer(actionGestureRecognizer);

                // Load the quote
                //Attempt to get the current quote if active
                var storedQuoteDataAsJson = QuoteManager.FetchQuote();

                // If quote is empty or expired pop to the contact screen
                if (String.IsNullOrEmpty(storedQuoteDataAsJson) || !QuoteManager.IsQuoteActive((int)NSUserDefaults.StandardUserDefaults.IntForKey("QuoteExpireTimeInSeconds")))
                {
                    AppDelegate.Self.PopToTarget(ControllerScreen.ContactController);
                }

                // Load the quote
                Quote currentQuote = QuoteManager.DeserializeQuote(storedQuoteDataAsJson);
                if (currentQuote != null)
                {
                    // NOTE: https required for iOS 9 ATS
                    var url = String.Format("{0}{1}", NSUserDefaults.StandardUserDefaults.StringForKey("WebURL"), currentQuote.QuoteID);
                    WebAppView.LoadRequest(new NSUrlRequest(new NSUrl(url)));
                }
            }
            else //UIWebView is not supported on iOS versions less than 11, so must use UIWebView
            {

                View.Frame = new CoreGraphics.CGRect(0, 108, 1024, 611);
                View.AddConstraint(NSLayoutConstraint.Create(View, NSLayoutAttribute.Height, NSLayoutRelation.Equal, View, NSLayoutAttribute.Height, 1.0f, 0.0f));
                View.AddConstraint(NSLayoutConstraint.Create(View, NSLayoutAttribute.Width, NSLayoutRelation.Equal, View, NSLayoutAttribute.Width, 1.0f, 0.0f));
                View.AddConstraint(NSLayoutConstraint.Create(View, NSLayoutAttribute.Trailing, NSLayoutRelation.Equal, View, NSLayoutAttribute.Trailing, 1.0f, 0.0f));
                View.AddConstraint(NSLayoutConstraint.Create(View, NSLayoutAttribute.Bottom, NSLayoutRelation.Equal, View, NSLayoutAttribute.Bottom, 1.0f, 43.0f));
                var WebAppView = new UIWebView(View.Frame);
                View.AddSubview(WebAppView);
                //set the margins and constraints

                // Add a tap recognizer to reset timer
                var actionGestureRecognizer = new UITapGestureRecognizer(this, new ObjCRuntime.Selector("HandleActionEvent:"));
                actionGestureRecognizer.NumberOfTapsRequired = 1;
                actionGestureRecognizer.Delegate = new GestureDelegate();
                WebAppView.AddGestureRecognizer(actionGestureRecognizer);

                // Load the quote
                //Attempt to get the current quote if active
                var storedQuoteDataAsJson = QuoteManager.FetchQuote();

                // If quote is empty or expired pop to the contact screen
                if (String.IsNullOrEmpty(storedQuoteDataAsJson) || !QuoteManager.IsQuoteActive((int)NSUserDefaults.StandardUserDefaults.IntForKey("QuoteExpireTimeInSeconds")))
                {
                    AppDelegate.Self.PopToTarget(ControllerScreen.ContactController);
                }

                // Load the quote
                Quote currentQuote = QuoteManager.DeserializeQuote(storedQuoteDataAsJson);
                if (currentQuote != null)
                {
                    // NOTE: https required for iOS 9 ATS
                    var url = String.Format("{0}{1}", NSUserDefaults.StandardUserDefaults.StringForKey("WebURL"), currentQuote.QuoteID);
                    WebAppView.LoadRequest(new NSUrlRequest(new NSUrl(url)));

                }
            }
        }

非常感谢任何帮助。提前致谢。

Answer 1

这应该可以使用WKNavigationDelegate

class AllowAllDelegate : WKNavigationDelegate
{
    public override void DecidePolicy(WKWebView webview, WKNavigationAction action, Action<WKNavigationActionPolicy> actionCallback)
    {
        // do some checks if you want to filter actions 
        actionCallback(WKNavigationActionPolicy.Allow);
    }
}

使用

WebAppView.NavigationDelegate = new AllowAllDelegate();

UIWebView与UIWebViewDelegate

相同

class AllowAllOldDelegate : UIWebViewDelegate 
{
    public override bool ShouldStartLoad (UIWebView webView, NSUrlRequest request, UIWebViewNavigationType navigationType) 
    {
        // do some checks if you want to filter actions 
        return true;
    }
}

使用

WebAppView.Delegate = new AllowAllOldDelegate();

如果您使用Weak Delegate mechanism。

，也可以避免创建新课程

Answer 2

我得到以下工作。请记住，我的整个项目都基于Xamarin's "HybridWebView" sample，其中包含适用于iOS和Android的自定义HybridWebViewRenderer类。我还使用了this question原始帖子中的信息。我没有遇到该用户遇到的同样问题。

新课程：

public class MyWKUIDelegate : WKUIDelegate
{
    public override WKWebView CreateWebView(WKWebView webView, WKWebViewConfiguration configuration, WKNavigationAction navigationAction, WKWindowFeatures windowFeatures)
    {
        var url = navigationAction.Request.Url;
        if (navigationAction.TargetFrame == null)
        {
            webView.LoadRequest(navigationAction.Request);
        }


        return null;
    }
}

将我的新MyWKUIDelegate分配给我的WKWebView实例的UIDelegate属性：

var config = new WKWebViewConfiguration { UserContentController = userController };

userController.AddScriptMessageHandler(this, "native");
WKWebView webView = new WKWebView(Frame, config);
webView.UIDelegate = new MyWKUIDelegate();

Xamarin WKWebView无法打开电子邮件和电话链接

2 个答案: