ViewModelViewHost class¶

Attributes: [DebuggerDisplay("{ViewModel}, {DefaultContent}")]

Summary¶

View source

A controller that resolves an IViewFor implementation for the supplied ViewModel and hosts it as a child view controller.

classDiagram
class ViewModelViewHost
class ReactiveViewController
ReactiveViewController <|-- ViewModelViewHost

Inherits from: ReactiveViewController

Remarks¶

ViewModelViewHost is useful when a view is responsible for projecting an arbitrary view model instance determined at runtime. The host listens for ViewModel or contract changes, resolves a view via ViewLocator, and swaps the child controller hierarchy accordingly.

Provide a DefaultContent controller to display placeholder UI while no view model is available, or set ViewContractObservable to drive platform-specific view selection.

The host asks the view locator for the view by the view model's run-time type, without building any type at run time, so it is safe to trim and to compile ahead of time. The default locator checks the view lookup the source generator writes, then the views the app added with Map. A view registered only with the service locator needs ViewModelViewHostUnsafe.

Examples¶

<![CDATA[
 var host = new ViewModelViewHost
 {
 ViewModel = screen.Router.CurrentViewModel.FirstAsync().Wait(),
 ViewLocator = locator,
 DefaultContent = new LoadingViewController()
 };
 
 host.ViewContractObservable = this.WhenAnyValue(x => x.SelectedTheme);
 ]]>

Constructors¶

Properties¶

Methods¶

Derived types¶

• ViewModelViewHostUnsafe