Cross Platform Dev with Xamarin discusses building apps that can run on multiple platforms using Xamarin. It describes the traditional "silo approach" of building apps separately for each platform versus the "write once, run anywhere" approach of Xamarin. Xamarin allows building native iOS, Android, and Windows apps using C# and sharing code across platforms. It provides native performance, user interfaces, and API access for each platform while allowing code reuse through Xamarin.Forms or traditional Xamarin approaches. The document demonstrates various Xamarin features through code samples and screenshots.

1. Cross Platform Dev with Xamarin
Houssem Dellai

2. The Silo Approach
Build App
Multiple Times

3. The Write-Once-Run-Anywhere Approach
Lowest Common
Denominator

4. The Anatomy of a Native App
Xamarin apps look and feel native because they are native
Native User Interfaces Native API Access Native Performance

5. Native Performance
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.

6. Xamarin + Xamarin.Forms
• Traditional Xamarin Approach • With Xamarin.Forms:
More code-sharing, all native
iOS C# UI Windows C# UIAndroid C# UI
Shared C# Logic
Xamarin.Forms
Shared C# Logic

8. ✓Always Up-to-
Date
Same-day support:
• iOS 5
• iOS 6
• iOS 7
• iOS 8
• iOS 9
• iOS 10
Full support for:
• Apple Watch
• Google Glass
• Android Wear
• Amazon Fire TV
• and much more

9. Code
Sharing
Stats
Mac
iOS
Android
Windows Phone
iCircuit Touch Draw
86%
14%
72%
28%
70%
30%
61%39%
88%
12%
76%
24%
90%
10%

10. Visual Studio Xamarin Studio

11. Xamarin Designer for iOS in Xamarin Studio

12. Pages
Content MasterDetail Navigation Tabbed Carousel

13. Layouts
Stack Absolute Relative Grid ContentView ScrollView Frame

14. ActivityIndicator BoxView Button DatePicker Editor
Entry Image Label ListView Map
OpenGLView Picker ProgressBar SearchBar Slider
Stepper TableView TimePicker WebView EntryCell
ImageCell SwitchCell TextCell ViewCell
Controls

20. Demo {Hello World}

21. Native UI from shared code
<ContentPage Title="Profile"
Icon="Profile.png">
<StackLayout Spacing="20" Padding="20">
<Entry Placeholder="Username“
Text="{Binding Username}"/>
<Entry Placeholder="Password"
Text="{Binding Password}“
IsPassword="true"/>
<Button Text="Login“
TextColor="White"
BackgroundColor="#77D065"
Command="{Binding
LoginCommand}"/>
</StackLayout>
</ContentPage>

22. Platform Customization

23. Demo {OnPlatform}

24. ListView

25. Demo {ListView}

28. Demo {Page Navigation}

31. Demo {TabbedPage}

34. Demo {MasterDetailPage}

35. NuGet Package Manager
NuGet support combined with the Xamarin Component Store gives Xamarin
developers the most comprehensive ecosystem of libraries at their fingertips

36. Accessing Web Services

37. Demo {web Services}
Demo {Web Services}

38. Nuget Packages

39. Xamarin Platform
is Open Source!
open.xamarin.com

41. Tizen .NET Developer Preview

43. Automatically test your app on
hundreds of mobile devices
Create native iOS, Android, Mac and
Windows apps in Visual Studio and
C#

44. Remote iOS Simulator For Windows
• Multi-Touch Enabled
• Pressure Sensitive
• Super Fast
• Rotate, screenshots,
location changes

45. Xamarin Inspector

46. Xamarin Profiler
• Allocations
• Cycles
• Memory
• Performance
• Time Profiler
• Windows & macOS

47. Xamarin.Forms Previewer
• Preview & Modify XAML Live
• Custom Control Rendering
• Xamarin Studio & Visual
Studio
• Preview Available TOday

56. Thank you  Questions ?