UINavigationBar.Appearance.TintColor ignored on xamarin Forms

I want to customize the text tint color in all my NavigationBars, BarTintColor works but I can't get Tintcolor to work. Is there a way to do it directly on the NavigationPage, I can't find a property for it.

Thanks!

Here's my code on AppDelegate:

UINavigationBar.Appearance.TintColor = UIColor.White;
UINavigationBar.Appearance.BarTintColor = UIColor.FromRGB (22, 160, 133);