private async Task AuthCommandExecute() { if (Device.RuntimePlatform == Device.iOS) { var authRs = await _localAuthService.AuthenticateAsync("Test for touch id"); if (authRs.IsSuccess) { await GoToMainPageAsync(); } else { await _pageDialogService.DisplayAlertAsync("Error", authRs.ErrorMessage, "Ok"); } } else { await _pageDialogService.DisplayAlertAsync("Error", $"Oops, not implemented on {Device.RuntimePlatform}", "Ok"); } }