Question about skie - I'm trying to set up skie on an older project and can't make sense of the Flow...

# touchlab-tools

[Peter Hsu]

Question about skie - I'm trying to set up skie on an older project and can't make sense of the Flow support. Reading the documentation, the converted values are supposed to implement AsyncSequence, but that doesn't seem to be the case when, when I try to treat it as an AsyncSequence, I get error messages:

For-in loop requires 'SkieKotlinFlow<T>' to conform to 'AsyncSequence'

[Tadeas Kriz]

Could you share more code for context? (code at call-site + code returning the Flow) This looks like something is returning just the non-bridged type (the one we're looking for is SkieSwiftFlow<T>)

[Peter Hsu]

How do I access the bridged type? I'm accessing the val specified in kotlin:

interface Model<TViewState :ViewState> {
  val viewState: Flow<TViewState>
  val navigationEventFlow: Flow<NavigationEvent>
}

interface NavigationEvent
interface ViewState

[Peter Hsu]

Task.init {
                for await awaitedValue in model.navigationEventFlow {
                    // do something
                }
            }

[Tadeas Kriz]

I wasn't able to reproduce it. Could you show the declaration of the model used in Swift?

[Tadeas Kriz]

image.png

[Peter Hsu]

ah it's fairly convoluted, I'll try to dig into it, maybe there was some extra bridging done in the past to create the model

[Tadeas Kriz]

What's the type of your model property?

[Tadeas Kriz]

The fact it gives you SkieKotlinFlow and not SkieSwiftFlow is really weird (either a known limitation that @Filip Dolník might remember, or possibly a bug)

[Tadeas Kriz]

If you need a workaround, you can do for await awaitedValue in SkieSwiftFlow(model.navigationEventFlow)

[Peter Hsu]

I couldn't find any references to SkieSwiftFlow - am I missing an import? It doesn't exist in the header for the generated framework

[Peter Hsu]

The model property is of CommonModel, which is an interface that extends the Model interface I mentioned above. On the swift side, it's a CommonModel being referenced. The models do have a few generic types associated with it, not sure if that's relevant

[Filip Dolník]

Hi!

> I couldn’t find any references to SkieSwiftFlow - am I missing an import? It doesn’t exist in the header for the generated framework
It should be enough to import your Kotlin framework. The SkieSwiftFlow is written in Swift so it’s not present in the Obj-C header - only in the Swift header.

> The models do have a few generic types associated with it, not sure if that’s relevant
It’s possible. The translation from SkieKotlinFlow to SkieSwiftFlow is done automatically by the Swift compiler and there are some cases in which it’s not possible to do, mainly if the Flow is a type argument (generics)


In the following example:

for await awaitedValue in model.navigationEventFlow {
   // do something
}

What is the exact type of model and model.navigationEventFlow expressions?