1. App Builders Switzerland | @appbuilders_ch
Building cross-platform mobile
apps with Xamarin
Hajan Selmani
Founder & CEO of HASELT
Founder of Hyper Arrow
Microsoft MVP

2. App Builders Switzerland | @appbuilders_ch

4. Xamarin
Deliver native iOS, Android and Windows apps using existing skills, teams, and code.

5. Xamarin
for Everyone

9. .NET
Simple, powerful and native

12. iOS – C# is ahead-of-time (AOT) compiled to ARM assembly language. The .NET framework is included, with
unused classes being stripped out during linking to reduce the application size. Apple does not allow runtime
code generation on iOS, so some language features are not available (see Xamarin.iOS Limitations ).
Android – C# is compiled to IL and packaged with MonoVM + JIT’ing. Unused classes in the framework are
stripped out during linking. The application runs side-by-side with Java/ART (Android runtime) and interacts
with the native types via JNI (see Xamarin.Android Limitations ).
Windows Phone – C# is compiled to IL and executed by the built-in runtime, and does not require Xamarin
tools. Designing Windows Phone applications following Xamarin’s guidance makes it simpler to re-use the
code on iOS and Android.

13. iOS – Xamarin.iOS exposes Apple’s CocoaTouch SDK frameworks as namespaces that you can reference from
C#. For example the UIKit framework that contains all the user interface controls can be included with a
simple using MonoTouch.UIKit; statement.
Android – Xamarin.Android exposes Google’s Android SDK as namespaces, so you can reference any part of
the supported SDK with a using statement, such as using Android.Views; to access the user interface controls.
Windows Phone – Windows Phone is not part of the Xamarin platform. When building apps for Windows
Phone in C#, the SDK is implicitly available to your application, including Silverlight/XAML controls for the
user interface.

15. Microsoft.Phone Microsoft.Networking Windows.Storage Windows.Foundation Microsoft.Devices
System.Data System.Windows System.Numerics System.Core System.ServiceModel
System.Net System System.IO System.Linq System.Xml

16. MapKit UIKit iBeacon CoreGraphics CoreMotion
System.Data System.Windows System.Numerics System.Core System.ServiceModel
System.Net System System.IO System.Linq System.Xml

17. Text-to-speech ActionBar Printing Framework Renderscript NFC
System.Data System.Windows System.Numerics System.Core System.ServiceModel
System.Net System System.IO System.Linq System.Xml

18. Shared C# codebase • 100% native API access • High performance
Windows-specific C#Android-specific C#iOS-specific C#
Shared C# Logic
Java
Android Studio
in
Android codebaseiOS codebase
Objective-C
XCode
in
C#
Visual Studio
in
Windows codebase

20. Common Mobile API
Speech Camera Settings Connectivity SMS Location
Platform Native APIs

21. Windows-specific C#Android-specific C#iOS-specific C#
Shared C# LogicJava
Android Studio
in
Objective-C
XCode
in
C#
Visual Studio
in
Shared Xamarin.Forms UI

28. App Builders Switzerland | @appbuilders_ch
THANK YOU
Building cross-platform mobile apps with Xamarin
Hajan Selmani
CEO & Founder of HASELT
Microsoft MVP