Boa tarde. Sou Novato em C# e UWP (Windows 10 Anniversary). Estou fazendo aquele cursinho no MVA, Windows 10 Desenvolvimento para Principiantes. N consigo implementar o evento para fazer a página voltar. Consigo adicionar o botão backbutton na barra de título.
Só que ao clicar não volta para a página anterior. Sou novato. Vai com calma aí. Vou copiar e colocar o código aqui:
Favor Não fechar a Thread. Estou com problemas para receber alertas!
E é um APP UWP. Mas estou aprendendo a desenvolver APPs para Windows 10 1607.
Softwares Utilizados: Windows 10 Anniversary 1607 14393.105 (Atualizado), Visual Studio 2015 Community Update 3 (Atualizado).
<!--MainPage.xaml-->
...
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--Relative panel-->
<RelativePanel Grid.Row="0">
<Button FontSize="22" Content="" FontFamily="Segoe MDL2 Assets" Click="Button_Click"/>
<TextBlock />
</RelativePanel>
<!--SplitView-->
<SplitView x:Name="SplitViewListBox" Grid.Row="1" DisplayMode="Overlay" OpenPaneLength="200" CompactPaneLength="56" HorizontalAlignment="Left">
<SplitView.Pane>
<!--List Box + Evento-->
<ListBox x:Name="IconListBox" SelectionMode="Single" SelectionChanged="IconListBox_SelectionChanged">
<!--ListBox Item Pag1-->
<ListBoxItem x:Name="lbiPag2">
<StackPanel Orientation="Horizontal">
<TextBlock FontSize="22" FontFamily="Segoe MDL2 Assets" Text="" HorizontalAlignment="Center" VerticalAlignment="Center"/>
<TextBlock x:Name="txbListBoxItemPag2" FontSize="22" Text="Pag 2" Margin="10,0"/>
</StackPanel>
</ListBoxItem>
<!--ListBox Item Pag2-->
<ListBoxItem x:Name="lbiPag3">
<StackPanel Orientation="Horizontal">
<TextBlock FontSize="22" FontFamily="Segoe MDL2 Assets" Text="" HorizontalAlignment="Center" VerticalAlignment="Center"/>
<TextBlock x:Name="txbListBoxItemPag3" FontSize="22" Text="Pag 3" Margin="10,0"/>
</StackPanel>
</ListBoxItem>
</ListBox>
</SplitView.Pane>
<!--SplitView Content-->
<SplitView.Content>
<Frame x:Name="MyFrame"/>
</SplitView.Content>
</SplitView>
</Grid>
...
// MainPage.xaml.cs
// IconListBox SelectionChanged - MainPage
private void IconListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (lbiPag2.IsSelected)
{
MyFrame.Navigate(typeof(Pag2));
SplitViewListBox.IsPaneOpen = !SplitViewListBox.IsPaneOpen;
}
if (lbiPag3.IsSelected)
{
MyFrame.Navigate(typeof(Pag3));
SplitViewListBox.IsPaneOpen = !SplitViewListBox.IsPaneOpen;
}
}
// ButtonClick Menu
private void Button_Click(object sender, RoutedEventArgs e)
{
SplitViewListBox.IsPaneOpen = !SplitViewListBox.IsPaneOpen;
}
// App.xaml.cs
sealed partial class App : Application
{
public App()
{
this.InitializeComponent();
this.Suspending += OnSuspending;
}
protected override void OnLaunched(LaunchActivatedEventArgs e)
{
#if DEBUG
if (System.Diagnostics.Debugger.IsAttached)
{
this.DebugSettings.EnableFrameRateCounter = false;
}
#endif
Frame rootFrame = Window.Current.Content as Frame;
if (rootFrame == null)
{
// Create a Frame to act as the navigation context and navigate to the first page
rootFrame = new Frame();
rootFrame.NavigationFailed += OnNavigationFailed;
rootFrame.Navigated += RootFrame_Navigated;
if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//TODO: Load state from previously suspended application
}
SystemNavigationManager.GetForCurrentView().BackRequested += App_BackRequested;
Window.Current.Activate();
Window.Current.Content = rootFrame;
}
if (e.PrelaunchActivated == false)
{
if (rootFrame.Content == null)
{
rootFrame.Navigate(typeof(MainPage), e.Arguments);
}
Window.Current.Activate();
}
}
// RootFrame_Navigated
private void RootFrame_Navigated(object sender, NavigationEventArgs e)
{
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = ((Frame)sender).CanGoBack ? AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed;
}
// APP BackRequested
private void App_BackRequested(object sender, BackRequestedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
if (rootFrame.CanGoBack)
{
rootFrame.GoBack();
e.Handled = true;
}
}
void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
{
throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
}
private void OnSuspending(object sender, SuspendingEventArgs e)
{
var deferral = e.SuspendingOperation.GetDeferral();
//TODO: Save application state and stop any background activity
deferral.Complete();
}
}
