Attempt at Xamarin Renderer that forces a page to be displayed as Landscape or Portrait. It currently does not work.

gistfile1.cs

public class OrientationNavigationRenderer : NavigationRenderer
{
    protected override Task<bool> OnPushAsync(Page page, bool animated)
    {
        if (page is RequestSignaturePadView)
        {
            var landscapePage = new ForceLandscapeViewController(page);
            PushViewController(landscapePage, animated);
            return Task.FromResult(true);
        }

        var portraitPage = new ForcePortraitViewController(page);
        PushViewController(portraitPage, animated);

        return Task.FromResult(true);
    }

    private sealed class ForcePortraitViewController : UIViewController
    {
        public ForcePortraitViewController(Page page)
        {
            _page = page;
        }

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

            var view = _page.CreateViewController().View;
            Add(view);
        }

        public override void ViewWillAppear(bool animated)
        {
            UIApplication.SharedApplication.SetStatusBarOrientation(UIInterfaceOrientation.Portrait, true);
            base.ViewWillAppear(animated);
        }

        public override bool ShouldAutorotate()
        {
            return false;
        }

        public override bool ShouldAutorotateToInterfaceOrientation(UIInterfaceOrientation interfaceOrientation)
        {
            return interfaceOrientation == UIInterfaceOrientation.Portrait || interfaceOrientation == UIInterfaceOrientation.PortraitUpsideDown;
        }

        public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations()
        {
            return UIInterfaceOrientationMask.Portrait;
        }

        private readonly Page _page;
    }

    private sealed class ForceLandscapeViewController : UIViewController
    {
        public ForceLandscapeViewController(Page page)
        {
            _page = page;
        }

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

            var view = _page.CreateViewController().View;
            Add(view);
        }

        public override void ViewWillAppear(bool animated)
        {
            UIApplication.SharedApplication.SetStatusBarOrientation(UIInterfaceOrientation.LandscapeLeft, true);
            base.ViewWillAppear(animated);
        }

        public override bool ShouldAutorotate()
        {
            return true;
        }

        public override bool ShouldAutorotateToInterfaceOrientation(UIInterfaceOrientation interfaceOrientation)
        {
            return interfaceOrientation == UIInterfaceOrientation.LandscapeLeft || interfaceOrientation == UIInterfaceOrientation.LandscapeRight;
        }

        public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations()
        {
            return UIInterfaceOrientationMask.Landscape;
        }

        private readonly Page _page;
    }
}