Xamarin in Action: Creating native cross-platform mobile apps

Chapter 3. MVVM—the model-view–view model design pattern

This chapter covers

• A more detailed look at what’s in the model, view model, view, and binding layers
• How a view model provides cross-platform UI logic by modeling state and behavior
• Using property-changed notifications
• Using commands
• How the binding layer glues the view and view-model layers together
• Value conversion in the view model and value converters
• What happens in the application layer
• Navigation patterns for MVVM apps

In the previous chapter we looked at the MVVM UI design pattern, before creating our first cross-platform example app. We’re going to examine that example app in a lot more detail, but first we need to look at the layers in an MVVM app in more depth. To do this ...