Using Prism with Xamarin Forms

Using Prism with Xamarin Forms talk given at 2018 Orlando Code Camp

Transcript

1. Using Prism with Xamarin Forms Ken Tucker
2. What we will cover What is Xamarin Forms Code sharing in Xamarin forms Standard Libraries What is Prism Create a prism App
3. What is Xamarin Forms Xamarin forms is a framework which allows you to create cross platform applications using c# or f# Allows you to write code once run it on iOS, Android, UWP and Mac Coming soon WPF and Linux (via Gtk#)
4. Code Sharing in Xamarin forms Shared library Portable Class library Standard Libraries
5. Shared Libraries Both iOS and Android app share one class library Use conditional compilation to support platform specific features
6. Portable Class libraries First attempt at making a cross platform dll Allowed you to use .net functions that exist in all the supported platforms Need to use dependency Injection for Platform specific features Needed to use Dependency Injection for saving to file system
7. .net standard Replace Portable class libraries Use contract to define what is supported in the .net standard version Support much more of .net framework than PCL Can do file access Use dependency injection for platform specific features
8. What is Prism? Prism was the code name for Microsoft Patterns and Practice Composite Application Blocks It is an MVVM framework Includes Dependency Injection container, Commanding, and EventToCommand Microsoft Turned over the project to open source developers in 2016 Prism currently uses .net Standard for code sharing
9. Getting started Need visual studio 2017 or Visual Studio 2017 for Mac Install prism template pack
10. Registering your Views Register in app.xaml.cs containerRegistry.RegisterForNavigation<MainPage>();

11. Page events in ViewModel OnNavigatedFrom OnNavigatingTo OnNavigatedTo Destroy
12. Commands DelegateCommand Also can set when command is active
13. Dependency Injection Create interface Create a Real Class Register it Add to ViewModels Constructor
14. Showing Dialogs Add IPageDialogService to view model constructor Await DisplayDialogAsync to show

15. Page Navigation Add to INavigationService to ViewModel constructor Await NavigateAsync to go to another page
16. Convert Json to class Use QuickType.io to convert json to c# classes Visual Studio 2017 addin for this
17. System.IO System.IO can be used in .net 2 standard libraries Can cache web service data with out using dependency injection
18. EventToCommand Can set up Event to command to raise a command when an event happens
19. Contact Info charp2ae@gmail.com Twitter @vb2ae https://csharp2ae.blogspot.com/ https://github.com/vb2ae/orlandocodecampprism