05 | Xamarin Forms, kódosztási technikák Farkas Bálint | Technical Evangelist | Microsoft

Xamarin.Forms bevezetés –Mi ez? –Követelmények Xamarin.Forms vezérlőelemek Kódosztási technikák –Portable Class Library-k –MVVM –Dependency Injection Heritage Properties Xamarin.Forms alapokon Xamarin.Forms Custom Renderer-ek Module Overview

Xamarin.Forms bevezetés

What is Xamarin.Forms?

Portable Class Library

Xamarin.Forms

Portable Class Library or Shared Project C# Platform Specific Shared C# Interface Code (Xamarin.Forms) Shared C# App Logic (ViewModels, Models etc)

Requires iOS 6.1+ Requires Android 4.0+ Requires WP8.0+ (Silverlight) WinRT previewben

Xamarin.Forms vezérlőelemek

Xamarin.Forms 1.Pages 2.Layouts 3.Views 4.Cells

Xamarin.Forms - Pages UIViewController Activity Page

Xamarin.Forms - Layouts

Xamarin.Forms - Views

Xamarin.Forms - Cells

Xamarin.Forms DataBinding Engine

DEMO Intro to Xamarin.Forms

Code Sharing – Portable Class Libraries

Portable Class Libraries Portable Class Library project template in Visual Studio 2012/2013 (except Express) –C# or Visual Basic –Good for creating a cross-platform.dll with pure business logic –Only managed code –Single codebase for Windows, Silverlight, Windows Phone, or Xbox –Only shared assemblies are available for use (mostly restricted to System namespaces) –Limited, but provides portable, modular, and encapsulated code

Portable Class Library One Source One Project One Binary Multiple Platforms

Portable Class Libraries Limits Platform Specific OS Functions Storage (no file I/O access) Alerts MessageBox GPS

Shared Projects #ifdef parancsokkal targetált kód Build időben hozzámásolódik a szülőprojekthez és azzal együtt fordul (ellentétben a PCL-lel, ami önálló DLL, így nem tudja, honnan van bereferálva)

Code Sharing – MVVM, Inversion of Control (IoC) and Dependency Injection

Container Dependency Injection Register Concrete Type PCL Locator Type1 : IType1 Type2 : IType2 Register ViewModel ViewModel IType2

Using Dependency Injection namespace HeritageProperties.PCL { public interface IGpsService { Task GetLocation(); }

public partial class LocationService : IGpsService { CLLocationManager manager = new CLLocationManager(); public Task GetLocation() { manager.StartUpdatingLocation(); return Task.Run(() => { var ret = new Location(); // code omitted for space // return the location return ret; }); }

SimpleIoc.Default.Register (); public MainViewModel(IGpsService gps) { this.GpsService = gps; }

ServiceLocator.Current.GetInstance ();

DEMO Implementing Heritage Properties for Android, iOS and Windows using Xamarin.Forms

Maps & Custom Renderers

// register the iGpsService for iOS SimpleIoc.Default.Register (); public MainViewModel(IGpsService gps, HeritagePropertyService service, INavigation navigation) { } Xamarin.Forms – Custom Renderers

[assembly: ExportRenderer(typeof(MapRenderer2), typeof(MapRenderer2Android))] public class MapRenderer2 : Map { } map = new MapRenderer2() { IsShowingUser = true, HeightRequest = 100, WidthRequest = 960, VerticalOptions = LayoutOptions.FillAndExpand }; Xamarin.Forms – Custom Renderers

Xamarin.Forms – Messaging Custom Renderer Custom Renderer (PCL) Send Message To Invoke Method Send Message To Notify of Event

DEMO Implementing Custom Renders For Maps

Xamarin.Forms intró –Mi ez? –Követelmények Xamarin.Forms vezérlőelemek Kódosztási technikák –Portable Class Library-k –MVVM –Dependency Injection Heritage Properties Xamarin.Forms alapokon Xamarin.Forms Custom Renderer-ek Module Recap

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