Xamarin Forms ScrollView - Change ScrollBarColor using RoutingEffect

AndroidScrollBarColorEffect.cs

using UIEffects = ScrollView.UI.Effects;

[assembly: ResolutionGroupName(Constants.EffectsNamespace)]
[assembly: ExportEffect(typeof(ScrollBarColorEffect), nameof(ScrollBarColorEffect))]

namespace ScrollView.Droid.Effects
{
    public class ScrollBarColorEffect : PlatformEffect
    {
        protected override void OnAttached()
        {
            UpdateUI();
        }

        protected override void OnDetached()
        {
        }

        void UpdateUI()
        {
            try
            {
                Java.Lang.Reflect.Field mScrollCacheField = Class.FromType(typeof(Android.Views.View)).GetDeclaredField("mScrollCache");
                mScrollCacheField.Accessible = true;
                var mScrollCache = mScrollCacheField.Get(Control);
                var scrollBarField = mScrollCache.Class.GetDeclaredField("scrollBar");
                scrollBarField.Accessible = true;
                var scrollBar = scrollBarField.Get(mScrollCache);
                var method = scrollBar.Class.GetDeclaredMethod("setVerticalThumbDrawable", Class.FromType(typeof(Drawable)));
                method.Accessible = true;

                var layers = new Drawable[1];
                var shapeDrawable = new ShapeDrawable(new RectShape());
                var scrollBarColor = Color.Default;

                var effect = (UIEffects.ScrollBarColorEffect)Element.Effects.FirstOrDefault(e => e is UIEffects.ScrollBarColorEffect);
                if (effect != null)
                {
                    scrollBarColor = effect.ScrollBarColor;
                }

                shapeDrawable.Paint.Color = scrollBarColor.ToAndroid();
                shapeDrawable.SetIntrinsicWidth(5);

                layers[0] = shapeDrawable;
                method.Invoke(scrollBar, layers);
            }
            catch
            {

            }
        }
    }
}

iOSScrollBarColorEffect.cs

using UIEffects = ScrollView.UI.Effects;

[assembly: ResolutionGroupName(Constants.EffectsNamespace)]
[assembly: ExportEffect(typeof(ScrollBarColorEffect), nameof(ScrollBarColorEffect))]

namespace ScrollView.iOS.Effects
{
    public class ScrollBarColorEffect : PlatformEffect
    {
        UIScrollView _view;
        UIColor _scrollBarColor;
        protected override void OnAttached()
        {
            Initialize();
        }

        protected override void OnDetached()
        {
            Uninitialize();
        }

        void Initialize()
        {
            _view = (UIScrollView)(Control ?? Container);
            _view.Scrolled += Container_Scrolled;

            var effect = (UIEffects.ScrollBarColorEffect)Element.Effects.FirstOrDefault(e => e is UIEffects.ScrollBarColorEffect);
            if(effect != null)
            {
                _scrollBarColor = effect.ScrollBarColor.ToUIColor();
            }
        }

        void Uninitialize()
        {
            _view.Scrolled -= Container_Scrolled;
        }

        private void Container_Scrolled(object sender, System.EventArgs e)
        {
            var subViews = _view.Subviews.ToList();
            var verticalIndicator = subViews.LastOrDefault();
            
            if(verticalIndicator != null)
            {
                verticalIndicator.BackgroundColor = _scrollBarColor;
            }
        }
    }
}

ScrollBarColorEffect.cs

namespace ScrollView.UI.Effects
{
    public class ScrollBarColorEffect : RoutingEffect
    {
        public ScrollBarColorEffect() : base($"{Constants.EffectsNamespace}.{nameof(ScrollBarColorEffect)}")
        {
        }

        public Color ScrollBarColor { get; set; }
    }
}