Can't Change Navigation Bar Appearance in iOS 13 Visual Studio

Question

In my Xamarin.Forms 4.4 project, I had defined the global colors for my navigation bar to be a solid orange with white text using the following code::

UINavigationBar.Appearance.BackgroundColor = UIColor.Orange;
UINavigationBar.Appearance.BarTintColor = UIColor.Orange;
UINavigationBar.Appearance.TintColor = UIColor.White;
UINavigationBar.Appearance.TitleTextAttributes = new UIStringAttributes()
{
  ForegroundColor = UIColor.White
};

Since upgrading my Xamarin.Forms NuGet package from 4.4 to 4.5, any app I run in iOS 13 has a solid white navigation bar in Light Mode with white text.

I know that there are some new classes to use for iOS 13. But, I don't understand is how to use these to get the same appearance, (or just something readable) in iOS 13. Here is what I have tried:

  UINavigationBarApperance nba = new UINavigationBarAppearance();
  nba.ConfigureWithOpaqueBackground();
  nba.BackgroundColor = UIColor.Orange;
  nba.BarTintColor = UIColor.Orange;
  nba.TintColor = UIColor.White;
  UINavigationBar.Appearance.ScrollEdgeAppearance = nab;
  UINavigationBar.Appearance.StandardAppearance = nab;
  UINavigationBar.Appearance.CompactAppearance = nab;

Here are my results:

I can actually see some color bleeding through what appears to be a white gradient overlay. I suspect the dark grey is a result of a dark gradient over my chosen color

Answer 1

I have tried with shared code , there is no problem in my local site no mattter in Xamarin.iOS or Xamarin.Forms project .Effect as follow :

Using shared code need to write in AppDelegate.cs .If writing in other place ,such as in Sub-ViewController, will not work .

// application events from iOS.
[Register("AppDelegate")]
public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
{
    //
    // This method is invoked when the application has loaded and is ready to run. In this 
    // method you should instantiate the window, load the UI into it and then make the window
    // visible.
    //
    // You have 17 seconds to return from this method, or iOS will terminate your application.
    //
    public override bool FinishedLaunching(UIApplication app, NSDictionary options)
    {
        global::Xamarin.Forms.Forms.Init();
        global::Xamarin.Forms.FormsMaterial.Init();

        LoadApplication(new App());

        Console.WriteLine("------13--------");
        UINavigationBar.Appearance.BackgroundColor = UIColor.Orange;
        UINavigationBar.Appearance.BarTintColor = UIColor.Orange;
        UINavigationBar.Appearance.TintColor = UIColor.White;
        UINavigationBar.Appearance.TitleTextAttributes = new UIStringAttributes()
        {
            ForegroundColor = UIColor.White
        };

        return base.FinishedLaunching(app, options);
    }
}

In addition , from shared screenshot , the color has been setted for NavigationBar . However , it was overrided with other color .I think there are somewhere code written affects this .

By the way , there are methods of Xamarin Forms to set color for Navigation Bar . You also can use this or check whether already uesd it in project .

App.xaml.cs :

NavigationPage navigationPage = new NavigationPage(new MainPage());
navigationPage.BarBackgroundColor = Color.White;
navigationPage.BarTextColor = Color.Black;
MainPage = navigationPage;