如何在WKWebView加载完成后调用ShowWebViewer方法（C#）

Hey there! Let's get your ShowWebViewer method to fire only after the WKWebView has finished loading the requested link, instead of immediately.

The Problem with Your Current Code #

Your line WebViewer.LoadRequest(url).Invoke(ShowWebViewer) is directly executing ShowWebViewer right away—this doesn't wait for the asynchronous web request to complete. LoadRequest returns a WKNavigation object, but using Invoke here just runs the delegate synchronously, ignoring the actual loading state.

The Solution: Use WKNavigationDelegate #

To trigger ShowWebViewer only after the page loads, we need to use WKWebView's navigation delegate to listen for the "finish loading" event. Here's how to implement it:

1. Make your class implement the IWKNavigationDelegate interface.
2. Assign the NavigationDelegate property of your WKWebView to your class instance.
3. Implement the DidFinishNavigation method, where you'll call ShowWebViewer.

Full Modified Code Example #

public class YourViewController : UIViewController, IWKNavigationDelegate
{
    private WKWebView WebViewer;

    public void SetLink(string link)
    {
        WebViewer = new WKWebView(View.Frame, new WKWebViewConfiguration());
        // Assign the navigation delegate to this class instance
        WebViewer.NavigationDelegate = this;
        WebViewer.SizeToFit();
        
        var url = NSUrlRequest.FromUrl(NSUrl.FromString(link));
        WebViewer.LoadRequest(url);
        // Remove the Invoke call—we'll trigger ShowWebViewer via the delegate
    }

    // This method is called when the web view finishes loading successfully
    [Export("webView:didFinishNavigation:")]
    public void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
    {
        // Now call ShowWebViewer since loading is complete
        ShowWebViewer();
    }

    // Optional: Handle failed navigation cases
    [Export("webView:didFailNavigation:withError:")]
    public void DidFailNavigation(WKWebView webView, WKNavigation navigation, NSError error)
    {
        // Add logic here to handle loading errors (e.g., show an alert to the user)
        Console.WriteLine($"Web view failed to load: {error.LocalizedDescription}");
    }

    private void ShowWebViewer()
    {
        // Your existing ShowWebViewer implementation goes here
    }
}

How This Works #

• By setting WebViewer.NavigationDelegate = this, you're telling the WKWebView to notify your class about navigation events like loading start, finish, or failure.
• The DidFinishNavigation method is an exported callback that gets triggered automatically when the web view successfully completes loading the requested page. This is where you safely call ShowWebViewer.

内容的提问来源于stack exchange，提问作者Darius Buhai