Xamarin Forms, MVVM and Testing
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The document provides an overview of Xamarin Forms, focusing on the MVVM (Model-View-ViewModel) design pattern, which emphasizes the separation of presentation and logic for building cross-platform applications. It highlights the technologies used, such as C#, XAML, and various programming languages, along with the benefits and drawbacks of unit testing in software development. Key concepts like data binding, state management, and performance for native interfaces across platforms like iOS and Android are also discussed.
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