Chapter 8. Building cross-platform view models
This chapter covers
- Creating simple and master/detail view models
- Adding state to view models using single-value and collection properties
- Adding behavior to view models when properties change and using commands
- Communicating between components using messaging
- View-model navigation
In the previous chapter we built the cross-platform model layers for our two apps, SquareRt and Countr. We looked at how you can wrap up your model layer in services and repositories that can be shared among different view models. Now it’s time to move up a layer and start coding the view models.
Like the model layer, the view-model layer is a cross-platform layer (figure 8.1). The difference is that whereas the model layer represents your data and business logic in a way that makes sense to your domain (for example, using services), the view-model layer represents the state and behavior of your UI and is written in a way that makes sense to your view layer.
