Mastering Xamarin.Forms - Second Edition

Updating the TripLog app

With the navigation service completed, we can now update the rest of the TripLog app to leverage it. To start with, we will update the constructor in the main App class in App.xaml.cs to create a new instance of the navigation service and register the app's page-to-ViewModel mappings:

public App(){    var mainPage = new NavigationPage(new MainPage());        var navService = DependencyService.Get<INavService>() as XamarinFormsNavService;    navService.XamarinFormsNav = mainPage.Navigation;    navService.RegisterViewMapping(typeof(MainViewModel),                                    typeof(MainPage));    navService.RegisterViewMapping(typeof(DetailViewModel),                                    typeof(DetailPage));    navService.RegisterViewMapping(typeof(NewEntryViewModel),                                    typeof(NewEntryPage));    MainPage ...