Question

我想在我的网页浏览中添加一个捏合事件，并根据Xamarin文档添加：

        PinchGestureRecognizer pinch = new PinchGestureRecognizer();
        pinch.PinchUpdated += ClearCache;
        webview.GestureRecognizers.Add(pinch);

然而，事件并未触发。我还需要做些什么才能让它发挥作用吗？

这是一种更加混乱的散射枪方法，我遇到的所有解决方案都无效：

public class SettingsPage : ContentPage {

    ICommand tapCommand;

    public SettingsPage() {

        var url = Path.Combine(DependencyService.Get<IBaseUrl>().Get(), "index.html");

        WebView webview = new WebView() {
            Source = new UrlWebViewSource { Url = url },
            WidthRequest = 1000,
            HeightRequest = 1000
        };

        //webview.Navigating += ClearCache; ********THIS WORKS*********

        Padding = Device.OnPlatform<Thickness>(
            new Thickness(1, 20, 1, 1),
            new Thickness(1),
            new Thickness(1)
            );

        PinchGestureRecognizer pinch = new PinchGestureRecognizer();
        pinch.PinchUpdated += ClearCache;
        webview.GestureRecognizers.Add(pinch);


        tapCommand = new Command(OnTapped);


        TapGestureRecognizer tap = new TapGestureRecognizer { NumberOfTapsRequired = 3 };
        tap.Tapped += ClearCache;
        tap.SetBinding(TapGestureRecognizer.CommandProperty, "TapCommand");
        tap.Command = tapCommand;
        webview.GestureRecognizers.Add(tap);

        StackLayout stackLayout = new StackLayout { Spacing = 0 };
        stackLayout.Children.Add(webview);
        stackLayout.Children.Add(btnClearCache);
        View parent = (View)webview.ParentView;
        parent.GestureRecognizers.Add(tap);
        parent.GestureRecognizers.Add(pinch);
        Content = webview;            
    }

    private void OnTapped(object obj) {
        var service = DependencyService.Get<IPlatformService>();
        service.ClearWebViewCache();
    }

    private void ClearCache(object sender, EventArgs e) {
        var service = DependencyService.Get<IPlatformService>();
        service.ClearWebViewCache();
    }

    public ICommand TapCommand {
        get { return tapCommand; }
    }

Answer 1

在手势方面，WebView非常讨厌。

您可以使用MR.Gestures来处理iOS，Android和WinPhone 8.0 Silverlight上的向下和向上手势。对于Win Phone 8.1 / WinRT，我还没有找到方法。如果您只需要iOS和Android，那么所有手势都可以在WebView上运行。

compatibility table on mrgestures.com中的更多信息。

Xamarin Webview手势没有开火

1 个答案: