CaritasPWA/Shared/AppState.cs

using System;

namespace CaritasPWA.Shared {
    public class AppState {

        private bool _loggedIn;
        public event Action OnChange;
        public bool LoggedIn {
            get { return _loggedIn; }
            set {
                if (_loggedIn != value) {
                    _loggedIn = value;
                    NotifyStateChanged();
                }
            }
        }

        private void NotifyStateChanged() => OnChange?.Invoke();
    }
}