Custom Tab title font for iOS

ExtendedTabbedPageRenderer.cs

using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
using UIKit;
using TabbedPageDemo.iOS;

[assembly: ExportRenderer(typeof(TabbedPage), typeof(ExtendedTabbedPageRenderer))]
namespace TabbedPageDemo.iOS
{
    public class ExtendedTabbedPageRenderer : TabbedRenderer
    {
        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);

            // Set Text Font for unselected tab states
            UITextAttributes normalTextAttributes = new UITextAttributes
            {
                Font = UIFont.FromName("ComicSansMS", 9.0F) // unselected
            };

            UITabBarItem.Appearance.SetTitleTextAttributes(normalTextAttributes, UIControlState.Normal);
        }
    }
}