Apply custom font on label in xamarin.iOS - xaml

Question

I want to apply Montserrat-Light font style in all the label and entry, I am doing it by making a renderer of controls. EntryRenderer is working fine but LabelRenderer is giving ArgumentNullException with message: Value can not be null.
[assembly: ExportRenderer(typeof(Label), typeof(ExtendedLabelRenderer))]
namespace NewApp.iOS.Renderer
{
public class ExtendedLabelRenderer : LabelRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
Control.Font = UIFont.FromName("Montserrat-Light", 10f);
}
}
}
}

Answer 1

Try below code. It will update if you haven't specified font-family and size in your XAML. Now you can set in your XAML also.
public class CustomLabelRender : LabelRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
{
base.OnElementChanged(e);
if (Control != null)
{
if (e.NewElement != null)
{
if (!String.IsNullOrEmpty(Element.FontFamily))
Control.Font = UIFont.FromName(this.Element.FontFamily, (nfloat)e.NewElement.FontSize);
}
}
}
}

Answer 2

As an easier approach to this issue, I would like to recommend the Label element and/or the CustomFontEffect of the free, open source Forms9Patch NuGet package. It allows you to store your custom font as an Embedded Resource in your Xamarin.Forms application's cross platform project (.NetStandard, PCL, or Shared Library) and then set that font's Embedded Resource ID as the FontFamily for any Xamarin.Forms element that has the FontFamily property.
var entry = new Xamarin.Forms.Entry {
Text = "Xamarin.Forms.Entry element",
FontFamily = "Forms9PatchDemo.Resources.Fonts.Pacifico.ttf"
};
entry.Effects.Add(Effect.Resolve("Forms9Patch.CustomFontEffect"));
var label = new Forms9Patch.Label
{
Text = "Custom Font Text",
FontFamily = "Forms9PatchDemo.Resources.Fonts.Pacifico.ttf"
}
Full disclosure: I am the author of this package.