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Xamarin iOS

Your viewmodels should inherit from ReactiveObject

Use IActivatableViewModel and WhenActivated for lifecycle

Keep references to your subscriptions

Use disposables to manage lifetime, scope and resources:

Don't use eventhandlers, use the extension methods shipped in reactiveui.events instead

Use your normal iOS concepts that you would usually use in iOS development, we have some base classes which you should use as they expose observables such as Changed, Changing and Deactivated that can be used for composition.