AppViewBackButtonVisibility not working

问题:

I'm trying to show a "back" button on my (Xamarin.Forms) UWP app when running on a desktop PC. I'm running the following code in the App's OnLaunched method:

SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;

But the back button is not shown.

The line does work on a pure UWP app. But not in Xamarin.Forms.

Is there any additional step needed to get this working?

EDIT

It seems now that when navigating to a new NavigationPage(page) instead of just the page - that's what creates this problem. Am checking it now.

回答1:

You need to use

MainPage=new NavigationPage(new rootPage).

Then use Navigation.PushAsync and PopAsync to get that Back button shown and hidden automatically