demo-xf-app-1a/MobileApp1/Views/Content/LoadingIndicatorView.xaml.cs

using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace MobileApp1.Views
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class LoadingIndicatorView : ContentView
    {
        public LoadingIndicatorView()
        {
            InitializeComponent();
        }


        public string Message
        {
            get => label1.Text;
            set
            {
                Device.BeginInvokeOnMainThread(() =>
                {
                    label1.Text = value;
                });
            }
        }

        public bool IsRunning
        {
            get => activityIndicator1.IsRunning;
            set
            {
                Device.BeginInvokeOnMainThread(() =>
                {
                    activityIndicator1.IsVisible = value;
                    activityIndicator1.IsRunning = value;

                    if (value)
                    {
                        label1.Text = string.Empty;
                    }

                });
            }
        }

    }
}