从文档中：How do I enable inspection?，如果要启用Web Inspector，需要将WKWebView的Inspectable属性设置为true：

[assembly: ExportRenderer(typeof(WebView), typeof(MyWebViewRenderer))]
namespace .....
{
      public class MyWebViewRenderer : ViewRenderer<WebView, WKWebView>
      {

            WKWebView wKWebView;
            public MyWebViewRenderer()
            {
            }

        protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
        {
            base.OnElementChanged(e);
                  if (Control != null) return;

                  var config = new WKWebViewConfiguration();
                  wKWebView = new WKWebView(Frame, config);

                  if (UIDevice.CurrentDevice.CheckSystemVersion(16, 0)) {
                   wKWebView.Inspectable = true;
            }
            

        }
    }
}