This document discusses building cross-platform mobile apps using Xamarin. It notes that traditionally, developing for iOS, Android and Windows required separate codebases in different languages and development environments, making code sharing difficult. Xamarin allows sharing a C# codebase across platforms, providing full native API access and high performance. It enables building user interfaces natively for each platform or sharing some or all of the UI code. Xamarin integrates with Visual Studio for development. It compiles to native code for each platform's store using ahead-of-time or just-in-time compilation. Visual Studio Mobile Center can be used to add services like crash reporting, push notifications and more.

3. Slides, Demos, & Lab - Clone or Download:
http://github.com/xamarin/dev-days-labs

6. iOS WindowsAndroid
Objective-C
Xcode
C#
Visual Studio
Java
Android Studio
No shared code • Many languages & development environments • Multiple teams

7. App Generator
Lua
Javascript
Actionscript
HTML+CSS
Limited native API access • Slow performance • Poor user experience

8. Shared C# codebase • 100% native API access • High performance
iOS C# UI Windows C# UIAndroid C# UI
Shared C# Mobile

9. 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
C#

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

11. 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
C#

12. Building User Interfaces

13. 3 Native User Interfaces
Shared App Logic
iOS C# Windows C#Android C#
Shared C# Logic

14. Shared User Interface
Shared App Logic
Shared C# Logic
Shared UI Code

15. CocosSharp
UrhoSharp

16. 86%
14%
72%
28%
70%
30%
61%
39%
88%
12%
76%
24%
90%
10%

17. Xamarin.iOS does full Ahead Of Time
(AOT) compilation to produce an ARM
binary for Apple’s App Store.
Xamarin.Android takes advantage of
Just In Time (JIT) compilation on the
Android device.

18. ✓Always Up-to-Date
•
•
•
•
•
•
•
•
•
•
•

21. Xamarin is included
in Visual Studio

23. Xamarin.com/Download

26. Visual Studio
for Mac (Preview)
iOS, Android, & macOS
.NET development
.NET Core & ASP.NET Core
Tools for Azure

27. • Multi-Touch Enabled
• Pressure Sensitive
• Super Fast
• Rotate, screenshots,
location changes
• Never leave VS

29. Shared C# Backend

30. What if we didn’t have to
write this code?
What if we could access
it from shared code?
UI+APIs UI + APIsUI + APIs
Battery
GPS
Lights
Notifications
Settings
Text To Speech
Battery
GPS
Lights
Notifications
Settings
Text To Speech
Battery
GPS
Lights
Notifications
Settings
Text To Speech

31. TextToSpeech
Speak(“Hello World”);
AVSpeechSynthesizer SpeechSynthesizer

32. Common API

36. A/B Testing
Live Update
Storage
Push Notifications
Crash Reporting
Remote Config.
Identity
Tables

37. A/B Testing
Live Update Storage
Push Notifications
Crash Reporting Remote Config. Identity
Tables
Visual Studio Mobile Center
mobile.azure.com

38. 15 Minute Break
Presenter First Name
Presenter Last Name
Presenter Title
Presenter e-mail blogs Twitter