05 Xamarin Forms kdosztsi technikk Farkas Blint Technical

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

Module Overview • 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

Xamarin. Forms bevezetés

What is Xamarin. Forms?

What is Xamarin. Forms?

Portable Class Library

Xamarin. Forms

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

Requires • i. OS 6. 1+ Requires • Android 4. 0+ Requires • WP 8. 0+ (Silverlight) • Win. RT previewben

Xamarin. Forms vezérlőelemek

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

Xamarin. Forms - Pages UIView. Controller Activity Page

Xamarin. Forms - Layouts

Xamarin. Forms - Views

Xamarin. Forms - Cells

Xamarin. Forms Data. Binding 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 • Message. Box • 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 (Io. C) and Dependency Injection

Dependency Injection Container Locator Type 1 : IType 1 Register Concrete Type 2 : IType 2 PCL Register View. Model IType 2

Using Dependency Injection namespace Heritage. Properties. PCL { public interface IGps. Service { Task<Location> Get. Location(); } }

public partial class Location. Service : IGps. Service { CLLocation. Manager manager = new CLLocation. Manager(); public Task<Location> Get. Location() { manager. Start. Updating. Location(); return Task. Run(() => { var ret = new Location(); // code omitted for space // return the location return ret; }); } }

Simple. Ioc. Default. Register<IGps. Service, Location. Service>(); Simple. Ioc. Default. Register<Main. View. Model>(); public Main. View. Model(IGps. Service gps) { this. Gps. Service = gps; }

Service. Locator. Current. Get. Instance<Main. View. Model>();

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

Maps & Custom Renderers

Xamarin. Forms – Custom Renderers // register the i. Gps. Service for i. OS Simple. Ioc. Default. Register<IGps. Service, Location. Service>(); public Main. View. Model(IGps. Service gps, Heritage. Property. Service service, INavigation navigation) { }

Xamarin. Forms – Custom Renderers [assembly: Export. Renderer(typeof(Map. Renderer 2), typeof(Map. Renderer 2 Android))] public class Map. Renderer 2 : Map { } map = new Map. Renderer 2() { Is. Showing. User = true, Height. Request = 100, Width. Request = 960, Vertical. Options = Layout. Options. Fill. And. Expand };

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

DEMO Implementing Custom Renders For Maps

Module Recap • 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

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