private async void OnNavigating(object sender, WebNavigatingEventArgs args) { if (args.Url.StartsWith("black://localhost/auth/spotify", StringComparison.CurrentCulture)) { web.Navigating -= OnNavigating; var uri = new Uri(args.Url); if (uri.Query.StartsWith("?code=", StringComparison.CurrentCulture)) { string code = uri.Query.TrimStart('?').Split('&').First().Split('=').LastOrDefault(); AuthorizationCodeAuth auth = await AuthorizationCodeAuth.GetToken(code); Application.Current.Resources["auth"] = auth; Application.Current.Properties["auth"] = auth.RefreshToken; await Application.Current.SavePropertiesAsync(); Application.Current.MainPage = new NavigationPage(new IndexPage()); } } }