The document provides a guide for developing cross-platform applications using Xamarin, emphasizing its shared C# codebase and full access to native APIs for high performance. It compares different approaches to app development, highlighting the benefits of Xamarin over traditional methods and outlining its architecture. Additionally, it discusses the integration of Xamarin with Visual Studio and offers architectural recommendations for Xamarin applications.

1. How to Develop Cross-platform apps with

2. for different kind of complex scenarios
and any absurd client’s demand
trying to stay focus,
avoiding losing your mind,
meanwhile your girlfriend is talking at you
and once again you do not pay attention to her.
And don’t worry,
if you’re reading this, at the end, you’re gonna be fine!
How to Develop Cross-platform apps with

3. How to Develop Cross-platform apps with

4. Chi sono?
[a-zA-Z]

5. Cosa è Xamarin?

6. ? ? ?
Ma come funziona Xamarin?

7. Silo Approach (o proprietary approach)
iOS WindowsAndroid
Objective-C
Xcode
C#
Visual Studio
Java
Android Studio
No shared code • Many languages & development environments • Multiple teams

8. Hybrid HTML: Write Once, Run Anywhere
App Generator
Javascript
HTML+CSS
Limited native API access • Slow performance • Poor user experience

9. Un esempio: Cordova

10. Approccio di Xamarin (native)
Shared C# codebase • 100% native API access • High performance
iOS C# UI Windows C# UIAndroid C# UI
Shared C# Mobile

11. Xamarin + Xamarin.Forms (super-native J)
• Traditional Xamarin Approach • With Xamarin.Forms:
More code-sharing, all native
iOS C# UI Windows C# UIAndroid C# UI
Shared C# Backend
Shared UI Code
Shared C# Backend

12. Ma come è nata l’architettura di
Xamarin?

13. .NET su Linux, la nascita di Mono

14. Mono for mobile

15. Bringing .NET to Android

16. Bringing .NET to Android

17. Bringing .NET to iOS

18. Bringing .NET to iOS

19. Bringing .NET to iOS

20. Windows APIs
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

21. iOS – 100% API Coverage
MapKit UIKit iBeacon CoreGraphics CoreMotion
System.Data System.Windows System.Numerics System.Core System.ServiceModel
System.Net System System.IO System.Linq System.Xml

22. Android – 100% API Coverage
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

23. Tutto ciò che puoi fare in Objective-C, Swift, o Java
puoi farlo con C# e Xamarin.

24. Strumenti di sviluppo

25. Xamarin is Open Source! – open.xamarin.com

26. Open Source
• Xamarin.iOS
• Xamarin.Mac
• Xamarin.Android
• Xamarin.Forms
• Bindings & Plugins
• Getting Started
• Contribution Guides

27. Xamarin is included
in Visual Studio!

28. Visual Studio Integration

29. Xamarin Studio

30. Visual Studio for Mac

31. Visual Studio iOS Simulator Remoting
• Multi-Touch
• Pressure Sensitive
• Rotate, screenshots,
location changes
• Tutto in VS

32. iOS Designer

33. Android Designer

35. iOS Build Process

36. IDE & OS

37. Architettura di una applicazione Xamarin

38. Consigli architetturali

39. Core Library

40. Core Library – Shared Project

41. Core Library – Shared Project

42. Core Library – Portable Class Libraries

43. Core Library – Portable Class Libraries

44. Core Library - .NET Standard Libraries

45. M-V-VM Pattern

46. M-V-VM in Xamarin

47. M-V-VM in Xamarin

49. Riferimenti DevDay

50. Xamarin Forms

51. XAML

52. Layout containers

53. Funzionalità Cross-Platform

54. Custom Renderers

56. La percentuale di adozione (e spesso di riuscita) in un
progetto di Xamarin.Forms è inversamente
proporzionale al numero di custom renderers usati!
tratto dal libro de Gli assurdi teoremi di Turibbio

58. https://www.xamarin.com/
https://developer.xamarin.com/guides/xamarin-
forms/creating-mobile-apps-xamarin-forms/