Hello, Is there any official guideline to share vi...

# multiplatform

[Mateusz Kolbusz]

Hello,
Is there any official guideline to share viewModel between android and ios in KMM?

[mbonnin]

Not sure what's considered official these days but this article from @John O'Reilly is a nice read!

[Mateusz Kolbusz]

Thank you a lot 😄

[Arkadii Ivanov]

You can also check https://github.com/arkivanov/Decompose, this library allows shared VMs, as well as navigation.

[Emre]

Does anyone have the experience to compare the two libraries. And any opinions on this?

[Arkadii Ivanov]

I'm not familiar with KMM-ViewModel, but I can say something about the "obsolete ViewModels" article. It uses Essenty library and it seems that the implementation could be much simpler, given the navigation is not covered in the article. E.g. one can create a shared ViewModel using Essenty library as follows:

// commonMain

class MyViewModel : InstanceKeeper.Instance {

    override fun onDestroy() {
        // Dispose things here
    }
}

Using in Android:

class MainActivity : AppCompatActivity() {

    private val instanceKeeper by lazy { instanceKeeper() }

    private val viewModel by lazy {
        instanceKeeper.getOrCreate(::MyViewModel)
    }
}

Using in other platforms would be close to the following:

fun main() {
    val viewModel = MyViewModel()
    
    // At some point later
    viewModel.onDestroy()
}