Xamarin.Forms is a UI framework that is built on top of Xamarin (for iOS and Android) and the Universal Windows Platform (UWP). Xamarin.Forms allows developers to create a UI for iOS, Android, and UWP with one shared code base, as illustrated in the following diagram. If we build an app with Xamarin.Forms, we can use XAML, C#, or a combination of both to create the UI:
The architecture of Xamarin.Forms
Xamarin.Forms is more or less just an abstract layer on top of each platform. Xamarin.Forms has a shared layer that is used by all platforms, as well as a platform-specific layer. The platform-specific layer contains renderers. A renderer is a class that maps a Xamarin.Forms control to a platform-specific native control. Each Xamarin.Forms control has a platform-specific renderer.
The following diagram illustrates how entry control in Xamarin.Forms is rendered to a UITextField control from the UIKit namespace when the shared Xamarin.Forms code is used in an iOS app. The...
