当 UIWebView 请求开始加载时，不会调用自定义 UIWebViewDelegate 的 ShouldStartLoad [英] ShouldStartLoad of custom UIWebViewDelegate not being called when UIWebView request starts loading

问题描述

我已经定义了一个 UIWebViewDelegate 类并在我的 UIWebView 的 Delegate 属性中实例化它，但是当 webview 加载请求时没有调用 ShouldStartLoad 方法.我究竟做错了什么?

这是定义我的 UIWebViewDelegate 和我的 UIWebView 的代码:

public class MyWebViewDelegate: UIWebViewDelegate{私有 UIWebView _view;公共 MyWebViewDelegate(UIWebView 视图){_view = 视图；}public override bool ShouldStartLoad (UIWebView webView,MonoTouch.Foundation.NSUrlRequest 请求，UIWebViewNavigationType 导航类型){System.Console.WriteLine("开始加载");返回真；}}公共类 MyWebView : UIWebView{私有静态 MyWebView _instance = new MyWebView();私有 MyWebView () : base(){this.Delegate = new MyWebViewDelegate(this);}公共静态 MyWebView 实例 {得到{返回_实例；}}公共无效负载(){this.LoadRequest (new NSUrlRequest(NSUrl.FromString("http://myurl"),NSUrlRequestCachePolicy.ReloadIgnoringLocalAndRemoteCacheData,5));}}

在我的 appdelegate 中，我将在 FinishedLaunching 方法中执行以下操作:

//创建表单视图控制器viewControllerForm = new UIViewController();viewControllerForm.View = MyWebView.Instance;viewControllerForm.Title = Localization.Translate("Forms");//加载网页视图MyWebView.Instance.Load();

请注意，我已使用复制/粘贴来提供此代码示例，因此此处可能存在一些小的复制/粘贴错误，但我的代码正在编译并且 webview 加载了请求；只是 ShouldStartLoad 没有被调用.

有人知道我在这里做错了什么吗?

解决方案

我通过使用 webview 的 ShouldStartLoad 属性解决了这个问题，如下所示:

myView.ShouldStartLoad = (webView, request, navType) =>{//在这里确定要做什么}

我从 miguel.de.icaza 对 此处.>

I have defined a UIWebViewDelegate class and instantiated it in the Delegate property of my UIWebView, but the ShouldStartLoad method is not being called when the webview loads a request. What am I doing wrong?

Here is the code defining my UIWebViewDelegate and my UIWebView:

public class MyWebViewDelegate: UIWebViewDelegate
{
    private UIWebView _view;
    public MyWebViewDelegate (UIWebView view)
    {
         _view = view;
    }   
    public override bool ShouldStartLoad (UIWebView webView, 
                                          MonoTouch.Foundation.NSUrlRequest request,
                                          UIWebViewNavigationType navigationType)
    {
        System.Console.WriteLine("Starting load");
        return true;
    }
}

public class MyWebView : UIWebView
{
   private static MyWebView _instance = new MyWebView ();
   private MyWebView () : base()
   {
       this.Delegate = new MyWebViewDelegate(this);
   }
   public static MyWebView Instance {
       get { return _instance; }
   }
   public void Load ()
   {
       this.LoadRequest (new NSUrlRequest(NSUrl.FromString("http://myurl"),
                           NSUrlRequestCachePolicy.ReloadIgnoringLocalAndRemoteCacheData,
                           5)
                        );
   }
}

In my appdelegate I am then doing the following in FinishedLaunching method:

// Create form view controller
viewControllerForm = new UIViewController();
viewControllerForm.View = MyWebView.Instance;
viewControllerForm.Title = Localization.Translate("Forms");

// Load webview
MyWebView.Instance.Load();

Note that I have used copy/paste to give this code sample, so there could be some minor copy/paste errors here, but my code is compiling and the webview loads the request; it is just that the ShouldStartLoad that is not being called.

Does anyone have any idea what I am doing wrong here?

解决方案

I solved this by making use of the ShouldStartLoad property of the webview as follows:

myView.ShouldStartLoad = (webView, request, navType) => {
     // Determine here what to do
}

I got this answer from miguel.de.icaza's answer to the question posted here.

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