iOSMaterialEntryRenderer.cs

public class MyMaterialEntryRenderer : MaterialEntryRenderer
{
    protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
    {
        base.OnElementChanged(e);

        TintCustomization(Control, e.NewElement as MyMaterialEntry);
    }

    protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        base.OnElementPropertyChanged(sender, e);            

        TintCustomization(Control, sender as MyMaterialEntry);
    }

    private void TintCustomization(UITextField Control, MyMaterialEntry customEntry)
    {
        if (Control == null) return;

        if (customEntry != null)
        {
            UITextField textField = Control;
            textField.BorderStyle = UITextBorderStyle.None;
            textField.TintColor = customEntry.MyHandleColor.ToUIColor();
        }
    }
}