This document discusses Prism, an open source framework for building cross-platform mobile apps with Xamarin Forms. It introduces Prism and some of its key features like MVVM, navigation, events, and dependency injection. It then provides steps to set up a Prism project, including selecting a dependency injection container and installing NuGet packages. It demonstrates connecting views and view models, navigating between pages, passing parameters, displaying alerts, and using services. Finally, it offers some Prism best practices and references additional resources.

1. Prism in Xamarin Forms
from Zero to Hero

2. Hello World!
Charlin Agramonte
charlin@crossgeeks.com
Twitter: @chard003
xamgirl.com
Rendy Del Rosario
rendy@crossgeeks.com
Twitter: @rdelrosario
xamboy.com

3. What’s Xamarin Forms
An open source mobile UI framework
from Microsoft for building
iOS, Android, & Windows apps with .NET
from a single shared codebase.

4. Frameworks we can use
▸ Prism
▸ MvvmCross
▸ FreshMvvm
▸ Mvvm Light
▸ Reactive UI

5. What’s
Prism?
▸ Loosely coupled
▸ Maintainable
▸ Testable applications

6. Why Prism?

7. Some of Prism Features
include:
▸ MVVM
▸ Navigation
▸ Events
▸ Commanding
▸ Modules
▸ Alerts
▸ Dependency Injection

9. How to Set
Up?

10. 1. Select a DI container
▸ Unity
▸ Autofac
▸ Ninjec
▸ Dryloc
Reference - XamGirl Guide:
https://xamgirl.com/prism-in-xamarin-f
orms-step-by-step-part-1/

11. 2. Install Nuget Package

12. 3. Update App.xaml.cs
Reference - XamGirl Guide:
https://xamgirl.com/prism-in-xamarin-f
orms-step-by-step-part-1/

13. 3. Update App.cs
Reference - XamGirl Guide:
https://xamgirl.com/prism-in-xamarin-f
orms-step-by-step-part-1/

14. 4. Add Platform Initializer
Android
Reference - XamGirl Guide:
https://xamgirl.com/prism-in-xam
arin-forms-step-by-step-part-1/

15. 5. Add Platform Initializer iOS
Reference - XamGirl Guide:
https://xamgirl.com/prism-in-xam
arin-forms-step-by-step-part-1/

16. Live
Prism DEMO
Let's get to coding!

17. Project
Structure

18. Connecting
View and
ViewModels

19. 2 ways to do it
1-Specifying the ViewModel associated
2-Do it by convention

20. Prism
Navigation

21. Relative
Absolute

22. Use the Prism Navigation Service in
your ViewModel

23. Live
Prism DEMO
Let's get to coding!

24. Passing
Parameters

25. Using Navigation Parameters
Using QueryString

26. INavigatedAware
Get your param

27. Go Back

28. You can pass parameters

29. Display an
alert

30. Inject the IPageDialogService

31. Bindable base

33. Delegate
Commands

35. Pre-registered services
▸ INavigationService
▸ IPageDialogService
▸ IEventAggregator
▸ IDeviceService

36. Services

37. 1-Create an
interface
2-Create your
service
4-inject it
3-Register it

38. Events

39. 1-Create
2-Inject it
3-Subscribe
4-Send

40. Modules

42. Prism Good
Practices

43. ▸ Don’t use hardcoded string for
navigation
▸ Avoid using Xamarin Forms namespace
in the ViewModels
▸ Make sure to use IDestructible to
unsubscribe to any events/viewmodel
cleanup
▸ Use a BaseViewModel
▸ Don’t use static/singleton instance
inside viewmodel code

44. THANKS!
Any questions?
You can find us at @chard003 | @rdelrosario

45. References
▸ Brian Lagunas Blog:
http://brianlagunas.com/
▸ XamGirl Prism Guides:
https://xamgirl.com/prism-in-xamarin-forms-step-by-st
ep-part-1/
▸ Prism Library Github Repo:
https://github.com/PrismLibrary/Prism