protected override async void OnAppearing() { this.model = await httpService.PegarPerguntaNaoRespondida(_id); if (this.model != null) { Navigation.InsertPageBefore(new QuizPage(this.model, _id), this); await Navigation.PopAsync(); } else { Text.Text = "Não existe mais perguntas disponíveis!"; Loading.IsVisible = false; NavigationPage.SetHasNavigationBar(this, true); NavigationPage.SetHasBackButton(this, true); } }