How to use native Frame navigation - Uno

Example

The complete sample code can be found in NativeFrameNav on Uno.Samples GitHub repository.

Step-by-step instructions

Create a new Uno Platform application, following the instructions in Get Started guide.
Add two more pages (BlankPage1 and BlankPage2) to the Your_Project_Name project

Right-click on the Your_Project_Name project -> Add -> New Item... -> Page (Uno Platform Windows App SDK) Repeat once

Modify the content of MainPage.xaml, BlankPage1.xaml, and BlankPage2.xaml pages to the following:

xml

<Grid toolkit:VisibleBoundsPadding.PaddingMask="Top">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>

    <CommandBar Grid.Row="0" Content="CHANGE_THE_TEXT_HERE" />
    <StackPanel Grid.Row="1">
        <TextBlock Text="CHANGE_THE_TEXT_HERE" />
    </StackPanel>
</Grid>

Put a different text for each page: "MainPage", "Content 1", "Content 2".

[!NOTE] Add xmlns:toolkit="using:Uno.UI.Toolkit" to the <Page> element.

Add a button for forward navigation in the first two pages:

MainPage.xaml and BlankPage1.xaml:

xml

<StackPanel Grid.Row="1">
    <TextBlock Text="Main Content" />
    <Button Content="Next Page" Click="GotoNextPage" />
</StackPanel>

MainPage.xaml.cs and BlankPage1.xaml.cs:

csharp

private void GotoNextPage(object sender, RoutedEventArgs e) => Frame.Navigate(typeof(BlankPage1)); // in MainPage
private void GotoNextPage(object sender, RoutedEventArgs e) => Frame.Navigate(typeof(BlankPage2)); // in BlankPage1

(Optionally) Add an AppBarButton to the CommandBar for back navigation in the last two pages for Skia heads:

BlankPage1.xaml and BlankPage2.xaml:

[!NOTE] Here a platform conditional is used to show the AppBarButton on the Skia platforms only. For more information on this feature, check out: platform specific XAML

xml

<Page ...
      xmlns:skia="http://uno.ui/skia"
      mc:Ignorable="d skia"
      ...>
    <!-- ...  -->
    <CommandBar Grid.Row="0" Content="BlankPage1">
        <CommandBar.PrimaryCommands>
            <skia:AppBarButton Content="Back" Click="NavigateBack" />
       </CommandBar.PrimaryCommands>
    </CommandBar>

BlankPage1.xaml.cs, BlankPage2.xaml.cs:

csharp

private void NavigateBack(object sender, RoutedEventArgs e) => Frame.GoBack(); // in both pages

Enable native frame navigation in App.cs or App.xaml.cs:

csharp

public App()
{
    InitializeLogging();

#if __IOS__ || __ANDROID__
    Uno.UI.FeatureConfiguration.Style.ConfigureNativeFrameNavigation();
#endif

    this.InitializeComponent();
    this.Suspending += OnSuspending;
}

Add some extra setups for navigation:

csharp

protected override void OnLaunched(LaunchActivatedEventArgs e)
{
    /* existing code... */

    ConfigureNavigation();
}

private void ConfigureNavigation()
{
#if __ANDROID__ || __WASM__
    var frame = (Frame)_window.Content;
    var manager = Windows.UI.Core.SystemNavigationManager.GetForCurrentView();

    // Toggle the visibility of back button based on if the frame can navigate back.
    // Setting it to visible has the follow effect on the platform:
    // - uwp: show a `<-` back button on the title bar
    // - wasm: add a dummy entry in the browser back stack
    frame.Navigated += (s, e) => manager.AppViewBackButtonVisibility = frame.CanGoBack
        ? Windows.UI.Core.AppViewBackButtonVisibility.Visible
        : Windows.UI.Core.AppViewBackButtonVisibility.Collapsed;

    // On some platforms, the back navigation request needs to be hooked up to the back navigation of the Frame.
    // These requests can come from:
    // - uwp: title bar back button
    // - droid: CommandBar back button, os back button/gesture
    // - wasm: browser back button
    manager.BackRequested += (s, e) =>
    {
        if (frame.CanGoBack)
        {
            frame.GoBack();

            e.Handled = true;
        }
    };
#endif
}

Additional Resources

Uno-specific documentation on CommandBar and AppBarButton
Native Frame navigation