UWP怎么双击后退按钮完全退出应用

最新推荐文章于 2020-06-24 22:47:54 发布

SKY徐

最新推荐文章于 2020-06-24 22:47:54 发布

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 private void M_BackRequested(object sender, BackRequestedEventArgs e)
        {
            Frame rootFrame = Window.Current.Content as Frame;
            if (rootFrame == null)
                return;
            if (rootFrame.CurrentSourcePageType.Name !="MainPage")
            {
                if (rootFrame.CanGoBack && e.Handled == false)
                {
                    e.Handled = true;
                    rootFrame.GoBack();
                }
            } 
            else if(e.Handled == false)
            {

                StatusBar statusBar = StatusBar.GetForCurrentView();
                statusBar.ShowAsync();
                statusBar.ForegroundColor = Colors.White; // 前景色
                statusBar.BackgroundOpacity = 0.9; // 透明度
                statusBar.ProgressIndicator.Text = "再按一次返回键退出程序。"; // 文本
                statusBar.ProgressIndicator.ShowAsync();
                
                if (isExit)
                {
                    App.Current.Exit();
                }
                else
                {
                    isExit = true;
                    Task.Run(async () =>
                    {
                        //Windows.Data.Xml.Dom. XmlDocument toastXml = ToastNotificationManager.GetTemplateContent(ToastTemplateType.ToastText01);
                        //Windows.Data.Xml.Dom.XmlNodeList elements = toastXml.GetElementsByTagName("text");
                        //elements[0].AppendChild(toastXml.CreateTextNode("再按一次返回键退出程序。"));
                        //ToastNotification toast = new ToastNotification(toastXml);
                        //ToastNotificationManager.CreateToastNotifier().Show(toast);     

                        await Task.Delay(1500);
                        await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
                        {
                            statusBar.ProgressIndicator.HideAsync();
                            statusBar.HideAsync();
                        });
                        isExit = false;
                    });
                    e.Handled = true;
                }
            }
        }