public void ShowNestedSample <TPage>(bool clearStack = false) where TPage : Page
{
if (NestedSampleFrame.Navigate(typeof(TPage)) && clearStack)
{
NestedSampleFrame.BackStack.Clear();
}
}
public void ShowNestedSample <TPage>(bool?clearStack = null) where TPage : Page
{
var wasFrameEmpty = NestedSampleFrame.Content == null;
if (NestedSampleFrame.Navigate(typeof(TPage)) && (clearStack ?? wasFrameEmpty))
{
NestedSampleFrame.BackStack.Clear();
}
}
public Shell()
{
this.InitializeComponent();
InitializeSafeArea();
this.Loaded += OnLoaded;
NestedSampleFrame.RegisterPropertyChangedCallback(ContentControl.ContentProperty, OnNestedSampleFrameChanged);
SystemNavigationManager.GetForCurrentView().BackRequested += (s, e) => e.Handled = BackNavigateFromNestedSample();
}
public bool BackNavigateFromNestedSample()
{
if (NestedSampleFrame.Content == null)
{
return(false);
}
if (NestedSampleFrame.CanGoBack)
{
NestedSampleFrame.GoBack();
}
else
{
NestedSampleFrame.Content = null;
#if __IOS__
// This will force reset the UINavigationController, to prevent the back button from appearing when the stack is supposely empty.
// note: Merely setting the Frame.Content to null, doesnt fully reset the stack.
// When revisiting the page1 again, the previous page1 is still in the UINavigationController stack
// causing a back button to appear that takes us back to the previous page1
NestedSampleFrame.BackStack.Add(default);