XFGloss Background Gradient Fails on iOS with Xamarin.Forms V16.8.0

[PatrickRyder]

XFGloss does not seem to be able to set the colour of the iOS navigation bar since I updated Xamarin.Forms to V16.8.0.

The following is an abbreviated way that I set a background gradient on my screens:

public abstract class ViewBase : ContentPage
{
    private XFGloss.Gradient GradientBackground = new XFGloss.Gradient()
    {
        Rotation = 0,
        Steps = new XFGloss.GradientStepCollection()
        {
            new XFGloss.GradientStep( Color.FromHex( "#888888"), 0.0 ),
            new XFGloss.GradientStep( Color.FromHex( "#777777"), 0.15),
            new XFGloss.GradientStep( Color.FromHex( "#666666"), 0.6 ),
            new XFGloss.GradientStep( Color.FromHex( "#555555"), 0.9 ),
            }
        };

    public ViewBase()
    {
        BackgroundColor = Colours.MainBackground;
        XFGloss.ContentPageGloss.SetBackgroundGradient( this, GradientBackground );
        Title = "My Content Page";
    }
}

This still compiles and runs without error but the navigation bar on iOS now remains the default white colour.