hey guys does anybody use moko viewModel with koin di? how you declare your viewModels modules in common code? koin

viewModel

helper factory available only for android projects. so we use the

factory

extension temporarily. but it recreates viewModel each time.

We have created our own: In common we have a

BaseViewModel

expect abstract class BaseViewModel()

And we create an

actual

for Android and another for iOS: Android:

actual abstract class BaseViewModel : ViewModel()

Which the Android extends

androidx.lifecycle.ViewModel

, which will work nicely with the Lifecycles. And the iOS just the simple one:

actual abstract class BaseViewModel

but moko mvvm already provides the common vm (which uses android vm for android). the problem is with providing via koin di. probably i should asj this question in the #koin 🙂

We are also using Koin, so for Android we have the

viewModel

method, but for iOS we had to make it a

factory

.

i get it. so you use platform specific modules. interesting. probably we gonna do the same

So for Koin, we have our own method too In common:

expect inline fun <reified T : BaseViewModel<*, *>> Module.viewModelDefinition(
    qualifier: Qualifier? = null,
    noinline definition: Definition<T>
): Pair<Module, InstanceFactory<T>>

While then for Android the implementation will call the Koin `viewModel`:

actual inline fun <reified T : BaseViewModel<*, *>> Module.viewModelDefinition(
    qualifier: Qualifier?,
    noinline definition: Definition<T>,
): Pair<Module, InstanceFactory<T>> = viewModel(qualifier = qualifier, definition = definition)

And for iOS will use a `factory`:

actual inline fun <reified T : BaseViewModel<*, *>> Module.viewModelDefinition(
    qualifier: Qualifier?,
    noinline definition: Definition<T>,
): Pair<Module, InstanceFactory<T>> = factory(qualifier = qualifier, definition = definition)

thanks!

Hello @wbertan, I'm having trouble implementing these extensions in my KMM project, I'm getting error message when trying to implement actual viewModelDefinition for android. Error message: Module.viewModel(Qualifier? = ...) where T = TypeVariable(T) for inline fun <reified T : ViewModel> Module.viewModel(qualifier: Qualifier? = ...): Pair<Module, InstanceFactory<T>> defined in org.koin.androidx.viewmodel.dsl Module.viewModel(Qualifier? = ..., Definition<TypeVariable(T)> My implementation:

actual inline fun <reified T : BaseViewModel> Module.viewModelDefinition(
    qualifier: Qualifier?,
    noinline definition: Definition<T>,
): Pair<Module, InstanceFactory<T>> = viewModel(qualifier = qualifier, definition = definition)

Also when I want to use this inside a fragment, how am I calling it?

🤔 how it is your

BaseViewModel

? Do you have any generics there as well? In the fragment we just do

private val viewModel: MyViewModel by viewModel()

That

viewModel

is from Koin:

import org.koin.androidx.viewmodel.ext.android.viewModel

This is my BaseViewModel

open class BaseViewModel : ViewModel() {

    open fun onViewCreated() {}

    open fun onViewResumed() {}

    open fun onViewPaused() {}

    open fun onViewStopped() {}
}

I use no generics. Soo I still use the same implementation with koin in module right?

val loginModule = module {
    viewModel {
        LoginViewModel(get())
    }
}

Sorry, did the test and forgot to post here, for me this is compiling fine:

open class Asas : ViewModel() {

    open fun onViewCreated() {}

    open fun onViewResumed() {}

    open fun onViewPaused() {}

    open fun onViewStopped() {}
}

inline fun <reified T : Asas> Module.viewModelDefinition(
    qualifier: Qualifier?,
    noinline definition: Definition<T>
): Pair<Module, InstanceFactory<T>> = viewModel(qualifier = qualifier, definition = definition)

In the Koin Module, you should then not use the

viewModel

, but instead that

viewModelDefinition

val loginModule = module {
    viewModelDefinition {
        MyViewModel()
    }
}

I guess my IDE was messed up, sorry for late response but it is working like a charm 🙂. Thank you very much for your help 🙂