shekhar23/claude-zero-to-hero-android-kmp/android-kmp-viewmodel

// commonMain — core:domain or feature module
abstract class CommonViewModel {
    private val viewModelScope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
 
    protected fun launch(block: suspend CoroutineScope.() -> Unit): Job =
        viewModelScope.launch(block = block)
 
    open fun onCleared() {
        viewModelScope.cancel()
    }
}

// androidMain
class TaskListViewModel(
    private val getTasks: GetTasksUseCase,
) : ViewModel() {
 
    private val _state = MutableStateFlow(TaskListState())
    val state: StateFlow<TaskListState> = _state.asStateFlow()
 
    init {
        viewModelScope.launch {
            getTasks().collect { tasks ->
                _state.update { it.copy(tasks = tasks) }
            }
        }
    }
}

// iosMain — thin wrapper so Swift can observe
class TaskListIosViewModel(
    private val getTasks: GetTasksUseCase,
) : CommonViewModel() {
 
    private val _state = MutableStateFlow(TaskListState())
    val state: StateFlow<TaskListState> = _state.asStateFlow()
 
    init {
        launch {
            getTasks().collect { tasks ->
                _state.update { it.copy(tasks = tasks) }
            }
        }
    }
}

// Swift — consume the StateFlow via a helper
let vm = TaskListIosViewModel(getTasks: ...)
let publisher = vm.state.toPublisher() // use KMP-NativeCoroutines or manual wrapper

// commonMain
import com.rickclephas.kmp.nativecoroutines.NativeCoroutinesState
 
abstract class CommonViewModel {
    @NativeCoroutinesState
    abstract val state: StateFlow<*>
}