如何在xamarin中缩放webview？

using Xamarin.Forms;

namespace WebViewZoomExample
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();

            var webView = new WebView
            {
                Source = new UrlWebViewSource { Url = "https://www.example.com" },
                Scale = 1, // 设置初始缩放比例
                EnableZoomControls = true // 允许用户手动缩放
            };

            var backButton = new Button
            {
                Text = "Back",
                IsEnabled = false
            };
            backButton.Clicked += (sender, e) =>
            {
                if (webView.CanGoBack)
                {
                    webView.GoBack();
                }
            };

            var forwardButton = new Button
            {
                Text = "Forward",
                IsEnabled = false
            };
            forwardButton.Clicked += (sender, e) =>
            {
                if (webView.CanGoForward)
                {
                    webView.GoForward();
                }
            };

            webView.Navigated += (sender, e) =>
            {
                backButton.IsEnabled = webView.CanGoBack;
                forwardButton.IsEnabled = webView.CanGoForward;
            };

            Content = new StackLayout
            {
                Children = { webView, backButton, forwardButton }
            };
        }
    }
}