或者 ...
1 NavigationPage.SetHasNavigationBar(this, false);
或者
<ContentPage ... NavigationPage.HasNavigationBar="{Binding IsFullScreen}"></ContentPage>
或者 ...
1 NavigationPage.SetHasNavigationBar(this, false);
或者
<ContentPage ... NavigationPage.HasNavigationBar="{Binding IsFullScreen}"></ContentPage>