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![Navigation in MvvmCross
[MvxContentPagePresentation(WrapInNavigationPage = true)]
public partial class RootPage : MvxContentPage<RootViewModel>
{
// your code
}
[MvxModalPresentation]
public partial class ModalPage :
MvxContentPage<ModalViewModel>
{
// your code
}](https://image.slidesharecdn.com/xamarinmvvmcrossindepth-180615130024/75/Xamarin-MvvmCross-in-depth-14-2048.jpg)
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Xamarin & MvvmCross in depth
- 1. Xamarin & MvvmCross indepth Nicolas Milcoff (aka @nmilcoff) Microsoft MVP - MvvmCross Maintainer
- 2. Agenda ▣ MVVM patternrecap ▣ Why to use an Open Source MVVM framework? ▣ MvvmCross ▣ Framework goodies ▣ Demos ▣ Q & A
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- 4. MVVM benefits ▣ Highlydecoupled components ▣ Code sharing ++ ▣ Scalability ▣ Working in parallel made easy ▣ Stable and proven pattern
- 5. Open Source (MVVM)Frameworks ▣ Abstractions discussions -- ▣ Barriers for new developers -- ▣ Requirements focus ++ ▣ Time saving ++ ▣ Inputs from multiple developers / teams ++
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- 8. Supported Platforms ▣ Xamarin.Android,Xamarin.iOS ▣ Xamarin.Mac, Xamarin.tvOS ▣ UWP, WPF ▣ Tizen (WIP) ▣ Console! ▣ Xamarin.Forms
- 9. Features in anutshell ▣ ViewModel first Navigation ▣ Data Bindings, Commands and Converters ▣ IoC Container / DI engine ▣ Platform specific widgets ▣ Unit Test Helpers ▣ Plugins ▣ Complete flexibility!
- 10. ViewModels ▣ Implement INotifyPropertyChanged ▣Lifecycle: □ void Prepare(MyObject parameter) □ Task Initialize() □ void Appearing(), void Appeared() □ void Dissapearing(), void Dissapeared() □ void ViewDestroyed() □ void SaveStateToBundle(IMvxBundle bundle) □ void ReloadFromBundle(IMvxBundle bundle)
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- 12. Navigation in MvvmCross ▣All logic remains in the shared code ▣ ViewPresenters for each platform ▣ Presentation attributes for declaration ▣ Presentation Hints for behavior ▣ 100% customizable
- 13. Navigation in MvvmCross publicclass RootViewModel : MvxViewModel { private readonly IMvxNavigationService _navigationService; public RootViewModel(IMvxNavigationService navigationService) { _navigationService = navigationService; } private async Task OpenModalAsync() { await _navigationService.Navigate<ModalViewModel>(); } }
- 14. Navigation in MvvmCross [MvxContentPagePresentation(WrapInNavigationPage= true)] public partial class RootPage : MvxContentPage<RootViewModel> { // your code } [MvxModalPresentation] public partial class ModalPage : MvxContentPage<ModalViewModel> { // your code }
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- 16. Data Bindings inMvvmCross ▣ Support for .cs, .xml, .axml, .xaml ▣ Value Converters ▣ Value Combiners ▣ OneWay, TwoWay, OneWayToSource, OneTime ▣ Multiple syntaxes ▣ Support for custom bindings
- 17. Data Bindings inMvvmCross ▣ Bindings in .axml (Tibet): local:mvxBind=“Text MyTextProperty” local:mvxBind=“Click MyAwesomeCommand” local:mvxBind=“Checked Inverse(Prop), Mode=TwoWay, Fallback=False”
- 18. Data Bindings inMvvmCross ▣ Bindings in xaml (Tibet): mvx:Bi.nd="Text MyTextProperty” mvx:Bi.nd=“Click MyAwesomeCommand” mvx:Bi.nd=“Checked Inverse(Prop), Mode=TwoWay, Fallback=False”
- 19. Data Bindings inMvvmCross ▣ Bindings in .cs (Fluent): set.Bind(MyLabel).For(v => v.Text).To(vm => vm.MyProperty); set.Bind(MyButton).To(vm => vm.MyAwesomeCommand); set.Bind(MySwitch) .For(v => v.On) .To(vm => vm.Prop) .WithConversion<InverseConverter>() .WithFallback(false);
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- 21. IoC Container andDI engine ▣ It’s optional ▣ Service Locator / IoC ▣ Constructor and Property Dependency Injection ▣ Singletons, dynamics, Open Generics, Child Containers ▣ Bulk registrations ▣ What if I prefer to use $Lib$ instead? Also possible!
- 22. IoC Container andDI engine Source: https://xamarinhelp.com/ioc-container-performance/
- 23. DEMO! IoC Container /DI Engine
- 24. Platform specifics ▣ Supportfor Android.Support packages ▣ Polymorphic lists made easy ▣ Support for background services / push notifications ▣ iOS Side Menu ▣ Abstraction plugins for most common features
- 25. Plugins ▣ Small codepieces that resolve specific situations ▣ Install from NuGet -> Run ▣ Official Plugins: Accelerometer, Visibility, Json, Color, Localization, Messenger, Email, … ▣ Loads of 3rd party plugins
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- 27. Resources & Documentation mvvmcross.com Whereour official documentation lives github.com/MvvmCross Official samples and source code Slack xamarinchat.herokuapp. com. Then join #mvvmcross StackOverflow Ask using the #mvvmcross tag Xamarin Forums Use the official forums Twitter Follow and don’t hesitate to contact influencers
- 28. Get involved! Support uson OpenCollective Contribute on GitHub Blog about your experiences Use the framework in your apps
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