有没有办法在Xamarin.Forms外壳顶部选项卡中显示图标？

[assembly: ExportRenderer(typeof(AppShell), typeof(CustomShellRenderer))]
namespace YourNamespace.Droid
{
    public class CustomShellRenderer : ShellRenderer
    {
        public CustomShellRenderer(Context context) : base(context)
        {
        }

        protected override IShellBottomNavViewAppearanceTracker CreateBottomNavViewAppearanceTracker(ShellItem shellItem)
        {
            return new CustomBottomNavViewAppearanceTracker();
        }
    }

    public class CustomBottomNavViewAppearanceTracker : IShellBottomNavViewAppearanceTracker
    {
        public void SetAppearance(BottomNavigationView bottomView, IShellAppearanceElement appearance)
        {
            // 在这里进行自定义外观设置，例如设置图标
            // 例如：bottomView.ItemIconTintList = null;
        }
    }
}

[assembly: ExportRenderer(typeof(AppShell), typeof(CustomShellRenderer))]
namespace YourNamespace.iOS
{
    public class CustomShellRenderer : ShellRenderer
    {
        protected override IShellTabBarAppearanceTracker CreateTabBarAppearanceTracker()
        {
            return new CustomTabBarAppearanceTracker();
        }
    }

    public class CustomTabBarAppearanceTracker : IShellTabBarAppearanceTracker
    {
        public void SetAppearance(UITabBarController controller, ShellAppearance appearance)
        {
            // 在这里进行自定义外观设置，例如设置图标
            // 例如：controller.TabBar.ItemSpacing = 10;
        }
    }
}