Hide Home Indicator in Xamarin Forms

I'm not able to set my home indicator to hidden. I have a NavigationPage with ContentPages.
I'm aware that I should override PrefersHomeIndicatorAutoHidden and then call SetNeedsUpdateOfHomeIndicatorAutoHidden(). Doesn't seem to work though.
I also tried ChildViewControllerForHomeIndicatorAutoHidden (see code below) but it doesn't seem to work at all.
What am I doing wrong?

using System.Linq;
using UIKit;
using Xamarin.Forms;
using PageRenderer = MyNamespace.PageRenderer;
using NavigationRenderer = MyNamespace.NavigationRenderer;

[assembly: ExportRenderer(typeof(ContentPage), typeof(PageRenderer))]
[assembly: ExportRenderer(typeof(NavigationPage), typeof(NavigationRenderer))]
namespace MyNamespace
{
    public class PageRenderer : Xamarin.Forms.Platform.iOS.PageRenderer
    {
        public override bool PrefersHomeIndicatorAutoHidden => true;

        public override void ViewDidAppear(bool animated)
        {
            base.ViewDidAppear(animated);
            SetNeedsUpdateOfHomeIndicatorAutoHidden();
        }
    }

    public class NavigationRenderer : Xamarin.Forms.Platform.iOS.NavigationRenderer
    {
        public override bool PrefersHomeIndicatorAutoHidden => true;

        public override UIViewController ChildViewControllerForHomeIndicatorAutoHidden
        {
            get
            {
                return ViewControllers.Any() ? ViewControllers.Last() : TopViewController;
            }
        }

        public override void ViewDidAppear(bool animated)
        {
            base.ViewDidAppear(animated);
            SetNeedsUpdateOfHomeIndicatorAutoHidden();
        }
    }
}