Navigate to new navigation page from ViewModel with Xamarin XLabs - mvvm

Question

I am trying to navigate to a new navigation page from a ViewModel
I have this snippet in my App.cs which makes a new navigation page and binds the ViewModel to the View
MainPage = new NavigationPage((Page)ViewFactory.CreatePage<MainViewModel, MainView>());
The snippet is from this article getting started xamarin forms labs xaml mvvm ioc # "5. Register the View with the ViewFactory"
But how would we do this in a ViewModel, and does it make sense to create a new page and bind the ViewModel and View together when we just binded them with ViewFactory.Register?
Snippet from the article:
public class App : Application
{
public App()
{
RegisterViews();
MainPage = new NavigationPage((Page)ViewFactory.CreatePage<MainViewModel, MainView>());
}
private void RegisterViews()
{
ViewFactory.Register<MainView, MainViewModel>();
}
}

Answer 1

No sure I undersant your question well but, here is what I do :
first in your AppDelegate (or main activity) register your Dependency Injection module (IDependencyContainer for a simpleContainer here):
var resolverContainer = new SimpleContainer();
UserService us = new UserService();
var app = new XFormsAppiOS();
resolverContainer.Register<IDevice>(t => AppleDevice.CurrentDevice)
.Register<IDisplay>(t => t.Resolve<IDevice>().Display)
.Register<IXFormsApp>(app)
.Register<IJsonSerializer, JsonSerializer>()
.Register<IDependencyContainer>(resolverContainer);
Resolver.SetResolver(resolverContainer.GetResolver());
Then on your app.cs, be sure to register the navigation service to goes whith your main navigation page
Page loginPage = new NavigationPage((LoginPage)ViewFactory.CreatePage<LoginViewModel, LoginPage>());
MainPage = loginPage;
Resolver.Resolve<IDependencyContainer>()
.Register<INavigationService>(t => new NavigationService(MainPage.Navigation)) //New Xlabs nav service
.Register<INavigation>(t => MainPage.Navigation); // old Xlabs nav service
And in your viewModel push to page you need
await Resolver.Resolve<INavigation>().PushAsync((ParameterPage)ViewFactory.CreatePage<ParameterViewModel, ParameterPage>(), false);