Can I create `viewModel` scoped to a `composable` using `nav kotlinlang #compose

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Title

# compose

zoha131

11/13/2020, 3:47 PM

Can I create

viewModel

scoped to a

composable

using

navigation-compose

Ian Lake

11/13/2020, 4:58 PM

That's what you get already when you use

viewModel()

inside those composables

nrobi

11/13/2020, 5:36 PM

@Ian Lake correct me if I'm wrong but AFAIK that way it will be scoped to the Fragment/Activity from where you call

setContent

, since it has to be tied to a

ViewModelStoreOwner

https://issuetracker.google.com/issues/165642391

Ian Lake

11/13/2020, 5:43 PM

You are indeed wrong 😄 Navigation provides its own

ViewModelStoreOwner

for each

NavBackStackEntry

as per the docs: https://developer.android.com/guide/navigation/navigation-programmatic#navbackstackentry

NavHost

overrides the ambients so that

viewModel()

within the composable uses that scoped owner

👍 1

This is mentioned in the Navigation Compose release notes: https://developer.android.com/jetpack/androidx/releases/navigation#compose-1.0.0-alpha01

👍 1

This ability to scope a ViewModel to individual composables is indeed a separate problem that is not yet solved, you are right about that part though

nrobi

11/13/2020, 5:50 PM

🎊 Ahh, thanks a lot for the clarification, didn't know about this 😁

zoha131

11/13/2020, 6:26 PM

I was reading the documentation and found nothing there about viewmodel. Now I am clear. thanks @Ian Lake

4 Views