ExtendedDatePickerRenderer.cs

using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
...
    
[assembly: ExportRenderer(typeof(ExtendedDatePicker), typeof(ExtendedDatePickerRenderer))]
...

public class ExtendedDatePickerRenderer : DatePickerRenderer
{
    private readonly DatePickerDelegate _delegate = new DatePickerDelegate();

    protected override void OnElementChanged(ElementChangedEventArgs<DatePicker> e)
    {
        base.OnElementChanged(e);

        Control.Delegate = _delegate;
    }
}