Xamarin iOS WKWebView DidFinishNavigation 和 DidStartProvisionalNavigation 未被调用

Question

我正在 iOS Xamarin 中实现 WKWebView，我想在加载开始和加载完成时做一些事情。我已经实现了 IWKNavigationDelegate 并添加了以下函数，但没有一个被调用。我是不是漏了什么

Class定义

 public partial class MasterViewController : UIViewController,IScanSuccessCallback, IWKScriptMessageHandler, IWKNavigationDelegate
{ }

导航委托函数

    public void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
    {
        Console.WriteLine ("DidFinishNavigation");
    }

    public void DidFailNavigation( WKWebView webView, WKNavigation navigation, NSError error )
    {
        // If navigation fails, this gets called
        Console.WriteLine("DidFailNavigation");
    }
    public void DidFailProvisionalNavigation( WKWebView webView, WKNavigation navigation, NSError error )
    {
        // If navigation fails, this gets called
        Console.WriteLine("DidFailProvisionalNavigation");
    }
    public void DidStartProvisionalNavigation( WKWebView webView, WKNavigation navigation )
    {
        // When navigation starts, this gets called
        Console.WriteLine("DidStartProvisionalNavigation");
    }

Answer 1

您需要将 NavigationDelegate class 显式分配给 webview

WKWebView web = new WKWebView();

// if the current class implements IWKNavigationDelegate, you can do this
web.NavigationDelegate = this;

// or you can create a separate class that implements IWKNavigationDelegate
web.NavigationDelegate = new MyWebDelegate();

Answer 2

补充 Jason 的回答。

您缺少可选委托方法所需的 ExportAttribute，当 Foo 是 ObjC 委托时，Xamarin Studio 自动完成引擎应在您每次实现任何 IFooInterface 时为您生成此内容然后你输入 override （它应该列出可选的而不是可选的成员）。 ExportAttribute 仅对可选成员（c# 接口中的非抽象成员）是必需的。

在这种特殊情况下，WKNavigationDelegate ObjC 协议的所有成员都是可选的，因此您需要 Export 属性和 ObjC 选择器作为其参数。

您需要在 using 语句中添加 using Foundation，ExportAttribute 就在其中。

[Export ("webView:didFinishNavigation:")]
public void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
{
    Console.WriteLine ("DidFinishNavigation");
}

[Export ("webView:didFailNavigation:withError:")
public void DidFailNavigation( WKWebView webView, WKNavigation navigation, NSError error )
{
    // If navigation fails, this gets called
    Console.WriteLine("DidFailNavigation");
}

[Export ("webView:didFailProvisionalNavigation:withError:")]
public void DidFailProvisionalNavigation( WKWebView webView, WKNavigation navigation, NSError error )
{
    // If navigation fails, this gets called
    Console.WriteLine("DidFailProvisionalNavigation");
}

[Export ("webView:didStartProvisionalNavigation:")]
public void DidStartProvisionalNavigation( WKWebView webView, WKNavigation navigation )
{
    // When navigation starts, this gets called
    Console.WriteLine("DidStartProvisionalNavigation");
}

希望这对您有所帮助。

Xamarin iOS WKWebView DidFinishNavigation 和 DidStartProvisionalNavigation 未被调用

Xamarin iOS WKWebView DidFinishNavigation and DidStartProvisionalNavigation not getting called

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