As mentioned in the introduction to this chapter, we created a customized NavigationService Interface and Class and then updated our BaseViewModel to include a property reference to our INavigationService so that each of our ViewModels can reference it.
The benefits of using an interface and class to define a platform-specific service is that they can be used within each of your ViewModels. Then, the implementations of the service can be provided using dependency injection.
This is achieved by declaring the DependencyService meta tag, with each of those implementations being actual services, or even Mock services that can be used to unit test your ViewModels, which we will be covering in Chapter 13, Unit Testing your Xamarin.Forms Apps.
In addition to the NavigationService interface and class that we created within...
