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Wpug mvvm and data binding
- 1. @slodge CrossPlatform Mobile C#, Mvvm and DataBinding WP7 Android iPhone iPad Win 8
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- 4. @slodge Coming up… • C# Cross Platform • An Mvvm Introduction • Some Code: TwitterSearch • Some Extras • Q&A
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- 6. @slodge Why C#? • You already have: – skills – tools – code • “low level” – compiles – testable – quick • Enables native look and feel on all platforms • Generics, Linq, Async and the future…
- 7. @slodge What you need – WP7: • A Windows 7 PC • Free Tools or better! • AppHub account $99 • A phone sometimes helps…
- 8. @slodge What you need - Android: • Windows PC or a Mac • Free Tools • Play account $25 • A phone really helps… • Mono 4 Android $400
- 9. @slodge What you need - iOS: • An Intel-based Mac • Account-Linked Tools • iOS Account $99 • A phone often helps… • MonoTouch - $400
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- 12. @slodge Mvvm Basics get/set Properties ViewModel call Commands ViewModel Model View ViewModel Whatever C# you Model View like! Model View notify changes some messaging
- 13. @slodge MVVM Technical Details • Properties • INotifyPropertyChanged • INotifyCollectionChanged • Data Binding • IValueConverter • ICommand • UI Thread
- 14. @slodge Mvvm Benefits • The “normal” reasons: – Separation of concerns – Designability (Blendability) – Testability • The MvvmCross reason: – Cross platform code reuse
- 15. @slodge Mvvm Cross Platform get/set Properties ViewModel call Commands ViewModel Model View ViewModel Whatever C# you Model View like! Model View notify changes some messaging Platform Specific Shared
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- 18. @slodge What we want to build… Home Page: Result Page:
- 19. @slodge The Model andService
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- 22. @slodge Navigation • The HomeViewModel calls: • Which means the TwitterViewModel gets created with:
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- 29. @slodge Inside WP7 App… • No C#, just XAML with {Binding} • Binding syntax includes: {Binding Path, Converter=Converter, ConverterParameter=Parameter, Mode=Mode, FallbackValue=Fallback}
- 30. @slodge Inside WP7 App… • ViewModel is auto-wired via MvxPhonePage<TViewModel> inheritance
- 31. @slodge Inside WP7 App… • ValueConverters are used for presenting property values
- 32. @slodge Inside WP7 App… • Lists…
- 33. @slodge Inside WP7 App… • Navigation is mapped to XAML Uri’s – with parameters put in a JSON object in the path. • Implementation hidden from the View and ViewModel.
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- 36. @slodge Inside Android App… • No C#, just xml with MvxBind attributes • MvxBind syntax is JSON based on XAML structure.
- 37. @slodge Binding – Xaml versus Mvx WP7: Text=‚{Binding SearchText,Mode=TwoWay}‛ Android: local:MvxBind=‚{‘Text’: {‘Path’:’SearchText’,’Mode’:’TwoWay’}}‛
- 38. @slodge Binding – Xaml versus Mvx WP7: Text=‚{Binding Timestamp,Converter={StaticResource TimeAgo}}‛ Android: local:MvxBind=‚{‘Text’: {‘Path’:’Timestamp’,Converter’:’TimeAgo’} }‛
- 39. @slodge Inside Android App… • ValueConverters are used for presenting property values
- 40. @slodge Inside Android App • ViewModels are auto-wired using MvxBindingActivityView<TViewModel> inheritance
- 41. @slodge Inside Android App… • Lists…
- 42. @slodge Inside Android App… • Navigation is mapped to Intent’s– with parameters put in a JSON object in the Extras. • Implementation hidden from the View and ViewModel.
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- 45. @slodge Inside iPhone App • UI is drawn in XML using Xcode • XIB is linked to C# classes using MonoTouch • Binding is declared in C# using JSON
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- 47. @slodge Inside iPhone App • ViewModels are auto-wired using inheritance and a constructor parameter:
- 48. @slodge Inside iPhone App • ValueConverters are used for presenting property values
- 49. @slodge Inside iPhone App • Lists…
- 50. @slodge Inside iPhone App • Navigation is mapped to C# calls. • Implementation mostly hidden from the View and ViewModel
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- 54. @slodge Inside iPad App • The iPad App is actually the iPhone App. • But the UI is different – take advantage of the larger screen. • Achieved in code: IMvxTouchViewPresenter
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- 58. @slodge Inside Windows 8Metro App…
- 59. @slodge Inside Windows 8Metro App…
- 60. @slodge Inside Windows 8 Metro App… It’s like WP7…. • No C#, just XAML with {Binding} • ValueConverters are used in Bindings • Lists are filled using ItemsSource • BUT: Navigation is achieved through code – not Xaml Uri’s
- 61. @slodge Inside Windows 8 Metro App Warnings: • MvvmCross WinRT implementation is “first cut” – e.g. differences in ViewModel lifecycle • Under-the-hood Win8 implementation is native code – there are big differences. – differences in XAML – differences in .Net/C# • Everything is async.
- 62. @slodge Inside Windows 8 Metro App… • Beyond the warnings – look at the numbers!
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- 64. @slodge TwitterSearch recap… • Shared C# Core – ViewModels – Models – Services – Converters – Tests • UIs are “mostly XML/JSON”
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- 66. @slodge Panoramas, Pivots and Tabs • Tabbed navigation is another common metaphor across phones and across ipads too. • Generally speaking think of each “tab” as its own ViewModel. • Binding is then available in each platform.
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- 68. @slodge Jump Lists • Are possible… • But need separate list formats on each platform… • Thinking about how best to do this… • Open to ideas!
- 69. @slodge Dependency Injection • Useful for testing • Essential for injecting platform specific services – e.g: – Camera capture – GPS services – NFC • MvvmCross wraps OpenNetCF DI – adds some extension methods: – RegisterServiceInstance<TService>(instance) – RegisterServiceType<TService, TServiceType>() – GetService<TService>()
- 70. @slodge Native Types • Sometimes #define is necessary… • Personally, I try to use interfaces and DI wherever possible.
- 71. @slodge i18n • Choices: – Each platform has their own localisation format available. – Xamarin are supporting .resx files… – MvvmCross provides a .json file mechanism – Or write your own
- 72. @slodge Blendability • Limited support available right now. • It’s relatively easy to integrate your own design time ViewModelLocator with design time data…
- 73. @slodge Problems? • WinRT – issues… • Xcode designer - OMG • iOS development and debugging is most painful • Some compiler differences – JIT • Multiple “core” project files annoying – and breaks refactoring • MvvmCross still changing
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- 75. @slodge That’s all folks… Hopefully we covered: • C# Cross Platform • An Mvvm Introduction • Some Code: TwitterSearch • Some Extras There might be time for: • Q&A
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