How to use moko-mvvm ViewModel with Composable Screens?

# moko

[Ahmad Hassan]

How to use moko-mvvm ViewModel with Composable Screens?

[alex009]

hi.
at now use can use ViewModel with remember.
like:

val vm = remember { MyViewModel() }

but on android after activity recreation you got new viewmodel instance in this case.
also onCleared will be not called automatically.

[alex009]

one of my team research now how integrate ViewModel better then just remember. when we found solution - we put it in moko-mvvm new release and also add into https://github.com/icerockdev/moko-compose-multiplatform-template

[alex009]

https://github.com/icerockdev/moko-compose-multiplatform-template/pull/2 you can subscribe to this pull request

[alex009]

it's all about Compose Multiplatform.
if you want to use moko-mvvm in android Composable you can use any way that you use with android jetpack ViewModel

[Ahmad Hassan]

so, as of now, State will be lost in configuration changes?

[alex009]

if you want use from Compose Multiplatform - yes. if from android compose - no

[Ahmad Hassan]

Well, I want to use from Compose Multiplatform.
Any time, when it will be fixed?

[alex009]

there nothing to "fix". it's not bug because ViewModel self not store self. On android ViewModels saved on configuration change by android navigation component, or by hilt, or by koin. not by viewmodel component.

we now research how implement similar behavior for compose multiplatform. now i can't say any estimates

[alex009]

you can try to implement own solution, with expect actual for example. also if you share own this solution to include in moko-mvvm - it will be good help 🙂

[alex009]

now i implement experiment version of getViewModel for compose multiplatform.
while release not published you can use it in own project just by copy-paste 🙂
and can give feedback about usability 🙂
https://github.com/icerockdev/moko-mvvm/tree/%23232-compose-multiplatform/mvvm-compose

[alex009]

Moko mvvm 0.16.0 released with getviewmodel support for compose multiplatform

[alex009]

https://github.com/icerockdev/moko-compose-multiplatform-template here you can check usage. Configuration change handled correctly, onCleared work good too