#100DAYSOFCODE Day8

10:30开始 继续c#

#region Navigation To and From with Back button
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            var currentView = Windows.UI.Core.SystemNavigationManager.GetForCurrentView();
            currentView.AppViewBackButtonVisibility = Windows.UI.Core.AppViewBackButtonVisibility.Visible;
            currentView.BackRequested += backButton_Tapped;

            base.OnNavigatedTo(e);
        }
        protected override void OnNavigatedFrom(NavigationEventArgs e)
        {
            var currentView = Windows.UI.Core.SystemNavigationManager.GetForCurrentView();
            currentView.AppViewBackButtonVisibility = Windows.UI.Core.AppViewBackButtonVisibility.Collapsed;
            currentView.BackRequested -= backButton_Tapped;

            base.OnNavigatedFrom(e);
        }

        private void backButton_Tapped(object sender, Windows.UI.Core.BackRequestedEventArgs e)
        {
            if (Frame.CanGoBack)
            {
                Frame.GoBack();
                e.Handled = true;
            }
        }
        #endregion