Hello, I am trying to use Flow in an iOS project ...

# coroutines

[Tristan]

Hello,

I am trying to use Flow in an iOS project using objective-c. I am not so familiar with the iOS environment.

Reading a bit some articles, I made the following code in Kotlin

class IosDispatcher : CoroutineDispatcher() {
    override fun dispatch(context: CoroutineContext, block: Runnable) {
        dispatch_async(dispatch_get_main_queue()) { block.run() }
    }
}

actual class PrimaryScope : CoroutineScope {
    private val dispatcher = IosDispatcher()
    private val job = Job()

    override val coroutineContext: CoroutineContext
        get() = dispatcher + job
}

fun <T>observe(origin: Flow<T>, block: (T) -> Unit): PrimaryScope {
    val scope = PrimaryScope()

    origin.onEach {
        block(it)
    }.launchIn(scope)

    return scope
}

But when I do use it, I am getting the error from the screenshot.

I use it like this (I tried with empty block in case it was related to a reference lost, or similar):

[UnityKotlinCoroutineHelperKt observeOrigin: self.tokenStorage.events
                                          block:^(id result) {
                                          }];

Do you have some example I could use? Or article explaining how to achieve this? Thanks a lot for your lights.

[mkrussel]

Any reason your not using the MainDispatcher from the coroutine library?

[Tristan]

Because I also had errors with it. But might be related to something else. I'll bug another channel about it 😄

[mkrussel]

My guess is your are noting using the native-mt version and accessing the dispatcher from a background thread, but not sure.

[Tristan]

And you are correct!