How to write an @Composable function in Swift

[jwcounts]

I have a mediaSessionService and a mediaController that I'm trying to open and manage on the Android side. If I do things directly in Kotlin, I can get everything working, but the function to manage the mediaController is @composable and can only be called from a @composable context. The easiest way I've found so far is to go into one of the generated Kotlin files (for example ContentView.kt) and directly insert the data there. See below:

@Composable
override fun ComposeContent(composectx: ComposeContext) {
    _hpmData.wrappedValue = EnvironmentValues.shared.environmentObject(type = StationData::class)!!
    _playback.wrappedValue = EnvironmentValues.shared.environmentObject(type = AudioManager::class)!!

    // INSERT CODE
    val mediaController by rememberManagedMediaController()
    _audioManager.wrappedValue.player = mediaController
    // END INSERT CODE

    super.ComposeContent(composectx)
}

I would like the mediaController to be a part of the AudioManager class, but again, the function I'm using to create and manage it is only available through an @composable function.

Does anyone know of a way to do this within Xcode/Swift/Skip, or am I better off just editing after the fact?

[jwcounts]

PlaybackService.txt

For reference, here is the Kotlin file for the mediaController. The @composable function is called rememberManagedMediaController()

I think the other issue is that the way I've gotten this to work relies on the by keyword in Kotlin, which delegates, I think? I haven't found a good analogue in Swift.

[marcprux]

I recommend starting with the docs on Compose Integration, and taking a look at various examples of how we do this.

The easiest way I've found so far is to go into one of the generated Kotlin files (for example ContentView.kt) and directly insert the data there.

Definitely don't do that, since your changes will be overwritten the next time you transpile the original Swift. You can use Skip Comments for simple modifications of the Kotlin output, or for more advanced usage, add a raw Kotlin file to your Skip/ folder and reference the types in that from your Swift code.

You might also want to consider building on top of our existing SkipAV framework, in case that is sufficient for your needs.

[jwcounts]

I saw some of the stuff about comments but I missed the Compose integration, so thank you for that. As for SkipAV, I did try that, but it didn't seem to be a good fit for our use case (or at least not quite yet). The actual ExoPlayer implementation is pretty simple and probably could have been handled by SkipAV, but it was all of the service scaffolding to enable background play and media controls and whatnot that was easier to implement in straight Kotlin.

[marcprux]

Great. Sounds like you are off to a good start. Let us know if we can help with any further guidance.

[aabewhite]

Note that generally you can replace "by remember..." with "= remember..." and then unwrap with ".value".

So for example:
val foo = remember...
foo.value.doSomething()

[jwcounts]

Interesting, I'll have to try that. Off of @marcprux's guidance, I was able to get it working using a combination of ComposeView and Skip Comments:

#if SKIP
ComposeView { context in
	// SKIP INSERT:
	// val mediaController by rememberManagedMediaController()
	// _playback.wrappedValue.player = mediaController
}
#endif