Failed to find VIewModel class defined in sub module on iOS platform.

[kingori]

I used metrox-viewmodel-compose and on iOS platform, app crashed when compose screen find viewmodel. Crash log is like below:

kotlin.IllegalArgumentException: Unknown model class class exmaple.sub.SubViewModel
Uncaught Kotlin exception:     at 0   MetroIosVMFailExample.debug.dylib   0x103d3507b        kfun:kotlin.Throwable#<init>(kotlin.String?){} + 99 
    at 1   MetroIosVMFailExample.debug.dylib   0x103d2f9db        kfun:kotlin.Exception#<init>(kotlin.String?){} + 95 
    at 2   MetroIosVMFailExample.debug.dylib   0x103d2fb9b        kfun:kotlin.RuntimeException#<init>(kotlin.String?){} + 95 
    at 3   MetroIosVMFailExample.debug.dylib   0x103d2fe73        kfun:kotlin.IllegalArgumentException#<init>(kotlin.String?){} + 95 
    at 4   MetroIosVMFailExample.debug.dylib   0x103f4c347        kfun:dev.zacsweers.metrox.viewmodel.MetroViewModelFactory#create(kotlin.reflect.KClass<0:0>;androidx.lifecycle.viewmodel.CreationExtras){0§<androidx.lifecycle.ViewModel>}0:0 + 787 
    at 5   MetroIosVMFailExample.debug.dylib   0x103f4bad7        kfun:androidx.lifecycle.ViewModelProvider.Factory#create(kotlin.reflect.KClass<0:0>;androidx.lifecycle.viewmodel.CreationExtras){0§<androidx.lifecycle.ViewModel>}0:0-trampoline + 115 
    at 6   MetroIosVMFailExample.debug.dylib   0x103f4a96b        kfun:androidx.lifecycle.viewmodel#createViewModel(androidx.lifecycle.ViewModelProvider.Factory;kotlin.reflect.KClass<0:0>;androidx.lifecycle.viewmodel.CreationExtras){0§<androidx.lifecycle.ViewModel>}0:0 + 131 
    at 7   MetroIosVMFailExample.debug.dylib   0x103f48743        kfun:androidx.lifecycle.viewmodel.ViewModelProviderImpl#getViewModel(kotlin.reflect.KClass<0:0>;kotlin.String){0§<androidx.lifecycle.ViewModel>}0:0 + 1143 
    at 8   MetroIosVMFailExample.debug.dylib   0x103f4898f        kfun:androidx.lifecycle.viewmodel.ViewModelProviderImpl#getViewModel$default(kotlin.reflect.KClass<0:0>;kotlin.String?;kotlin.Int){0§<androidx.lifecycle.ViewModel>}0:0 + 283 

It works well on android and JVM, but failed on iOS platform. I think this problem is something releated to Kotlin Native, but it's hard to solve. Can I get a help for this problem?

I made a sample reproduceable project here: https://github.com/kingori/IosMetroVmClassFindFail
The project is looks alike compose-viewmodels sample project.

I have two modules, :composeApp and :submodule and defined ViewModel on :submodule.

@Inject
@ViewModelKey(SubViewModel::class)
@ContributesIntoMap(AppScope::class)
@ObjCName("SubViewModel")
class SubViewModel( val subItem: SubItem) : ViewModel() {
    val _state = MutableStateFlow(0)

    val state : StateFlow<Int> =  _state.asStateFlow()

    fun increase() {
        _state.value += 1
    }
}

When I tried to use it in :composeApp or :submodule, app crashed.

// use viewmodel in :submodule - failed
@Composable
fun SubVmScreenInSubModule(onNavigateBack: () -> Unit, viewModel: SubViewModel = metroViewModel()) {

// use viewmodel in :composeApp - failed
@Composable
fun SubVmScreen(onNavigateBack: () -> Unit, viewModel: SubViewModel = metroViewModel()) {

I think this problem is releated to project's settings. Is there any solution for this?

[ZacSweers]

Per the docs, contributing bindings across modules in non-jvm compilations doesn't work yet. Follow #460