I’m using the Jetbrains Compose navigation library which also contains support for KMP view models. ...

# compose-desktop

[kevin]

I’m using the Jetbrains Compose navigation library which also contains support for KMP view models.

If I create a view model:


import androidx.lifecycle.ViewModel

class MyViewModel : ViewModel() {


I can use that view model in my composable:


@Composable
fun MainScreen() {

val viewModel = viewModel<MyViewModel>()


This all appears to work.

However, as soon as I try and use that composable inside navigation :


NavHost(
navController = navController,
...
) {
composable(Screen.Start.name) {
MainScreen()
}
}



I get this:


``Factory.create(String, CreationExtras)` is not implemented. You may need to override the method and provide a custom implementation. Note that using Factory.create(String) is not supported and considered an error.`


I created the app using the KMP wizard (desktop only), added the org.jetbrains.androidx.navigation:navigation-compose library (I’ve tried both 2.7.0-alpha07 and 2.8.0-alpha02) and modified it as little as possible to set up navigation

[Ivan Matkov]

Thanks for the report.

As workaround, please use this syntax to avoid relying on JVM reflection (required for iOS/web anyway):

val viewModel = viewModel { MyViewModel() }

[kevin]

Thanks, that works for me

[Alexander Maryanovsky]

Also, you can use triple-backticks to add a code-block in Slack:

code goes here

[kevin]

Thanks. I did try that earlier and for some reason it didn’t work - I must’ve done something stupid 🤷