无法在Xamarin IOS中捕获WkWebView屏幕

using System;
using CoreGraphics;
using Foundation;
using UIKit;
using WebKit;

public class MyWKWebViewDelegate : WKNavigationDelegate
{
    public override void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
    {
        webView.TakeSnapshot(new CGRect(CGPoint.Empty, webView.Frame.Size), (image, error) =>
        {
            if (image != null)
            {
                // 处理截取到的图像
                // ...
            }
            else if (error != null)
            {
                // 处理错误
                // ...
            }
        });
    }
}

public class MyViewController : UIViewController
{
    private WKWebView webView;

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        webView = new WKWebView(View.Frame, new WKWebViewConfiguration());
        webView.NavigationDelegate = new MyWKWebViewDelegate();
        View.AddSubview(webView);

        // 加载网页
        webView.LoadRequest(new NSUrlRequest(new NSUrl("https://www.example.com")));
    }
}