ListView Hintergrundfarbe des selektierten Elements - Xamarin Forms

Copyusing System;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer (typeof(ViewCell), typeof(MyAPP.iOS.CustomAllViewCellRendereriOS))]
namespace MyAPP.iOS
{
    public class CustomAllViewCellRendereriOS : ViewCellRenderer
    {
        public override UIKit.UITableViewCell GetCell (Cell item, UIKit.UITableViewCell reusableCell, UIKit.UITableView tv)
        {
            var cell =  base.GetCell (item, reusableCell, tv);
            if (cell != null)
                cell.SelectionStyle = UIKit.UITableViewCellSelectionStyle.None;
            return cell;
        }
    }
}

Copy<?xml version="1.0" encoding="UTF-8"?>
<resources>
	<style name="CustomTheme" parent="android:Theme.Holo.Light">
		<item name="android:colorActivatedHighlight">@android:color/transparent</item>
	</style>
</resources>