GKAC 2015 Apr. - Xamarin forms, mvvm and testing
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This document discusses Xamarin Forms, MVVM design pattern, and testing. It covers how Xamarin Forms allows building cross-platform mobile apps using C# and XAML that are natively backed. It also describes the MVVM pattern which separates presentation and logic for testability using bindings, properties, collections and commands. Events like PropertyChanged, CollectionChanged, and CanExecuteChanged are used to notify views of changes.
GKAC 2015 Apr. - Xamarin forms, mvvm and testing
- 1. Xamarin Forms, MVVM and Testing
- 2. Speaker
- 6. with Xamarin Forms for 8 Months iOS with Xamarin Forms for 3 Weeks Android
- 8. Xamarin
- 11. C# 3.0 (2007)Java 8 (2014) C# 5.0 (2013) C# 4.0 (2010) Lambda Expression Trees LINQ Lambda Streams Dynamic Asynchronous
- 12. Native • Native User Interfaces • Native API Access • Native Performance
- 15. Xamarin Forms
- 16. App Logics Cross-platform Natively Backed UI Platform-specific API iOS Platform-specific API Android Platform-specific API Windows Phone
- 17. XAML • Extensible Application Markup Language • XML • WPF(2006) • 2-way Binding • Data Templating
- 21. MVVM(Model-View-ViewModel) • In 2005, John Gossman(Microsoft) • A Variation of MVC • Separation of Presentation and Presentation Logic • 2-way Binding • Testability • WPF, Silverlight, Xamarin Forms, AngularJS, EmberJS, KnockoutJS, RoboBinding • Introduction to Model/View/ViewModel pattern for building WPF apps • WPF Apps With The Model-View-ViewModel Design Pattern
- 22. ViewModel • An Abstraction of a View • State and Behavior • Does not need a reference to a view
- 23. ViewModel Presentation Logic View User Interface Model Business Logic and Data 2-way Binding
- 24. Unit Testing
- 25. Unit Testing Pros • Cheap • Finds problems early • Living Documentation • As a Design Element Cons • Not catch integration errors • Not catch system-level errors • Can’t write for user interfaces
- 26. Presentation Layer View(UI) ViewModel(Presentation Logic) • No Reference to Views • No Lifecycle Constraint Testable
- 27. Bindings
- 28. Bindings • Properties • Collections and Templating • Commands
- 30. Collections and Templating <ListView ItemsSource="{Binding Users}"> <ListView.ItemTemplate> <DataTemplate> <ViewCell> <Label Text="{Binding Name}" /> </ViewCell> </DataTemplate> </ListView.ItemTemplate> </ListView>
- 32. Events
- 33. Events • PropertyChanged • CollectionChanged • CanExecuteChanged
- 36. Commands • ICommand • CanExecute • CanExecuteChanged
- 37. Summary
- 38. Xamarin • C# • Native • Visual Studio • Designer
- 39. Xamarin Forms • Cross-platform Natively Backed UI • XAML • 2-way Binding • Data Templating
- 40. MVVM • Separation of Presentation and Presentation Logic • 2-way Binding • Testability • Property, Collection, Command • PropertyChanged, CollectionChanged, CanExecuteChanged