Build Cross-Platform Android and iOS UIs with Xamarin Forms

Xamarin aims to provide a solution to allow companies and developers develop natively and cross-platform. Using Xamarin, developers can target Android, iOS and Windows (Mobile) 10, using a single industry standard language, C#. Certain aspects of the code base are platform specific, for example the UI layer, forcing programmers to develop them repeatedly for each platform.

In 2014, Xamarin introduced Xamarin Forms (XF). XF introduces an abstraction layer which allows developers to declare the UI using XAML (Extensible Application Markup Language) declarations and/or code.

Xamarin vs Xamarin Forms

Using XF, programmers are now able to define and create mobile applications targeting multiple platforms with the same code and definitions. XF renders those instructions into platform-specific code and user experiences. Using this approach, applications get a native user experience, controls and patterns familiar to their users.

Example of the same UI rendered on different platforms

XAML makes the creation of the UI declarative and succinct in comparison to creating the UI by code, but it’s not required to get started. Developers with a background in XAML related technologies, such as WPF (used to develop Windows desktop applications) or Windows Phone / Windows Store applications, will feel at home, since many of the concepts are similar.

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Source: Sitepoint