anyone here use Koin for multiplatform projects? I...

# multiplatform

[Adam Brown]

anyone here use Koin for multiplatform projects? I'm doing some KMM prototyping and am woundering if I can use Koin to inject in my Swift code

[wbertan]

We use, so far it works.

[Adam Brown]

what does injection look like in swift code? I can't find any examples

[wbertan]

Okay-ish:

DependencyListDirectory.default.get(IsAuthenticatedUseCase.self)

That get is our function:

func get<T>(_ type: T.Type) -> T {
        sharedDependencyList.get(objCObject: type) as! T
    }

    func get<T>(_ type: T.Type, qualifier: Qualifier?) -> T {
        sharedDependencyList.get(objCObject: type, qualifier: qualifier) as! T
    }

Which calls in the Koin instance: private var sharedDependencyList: Koin!
And that get in Koin is our own extension defined in the ios sourceset in Kotlin, as to retrieve the Kotlin class:

// region Helper functions to retrieve a Koin dependency from Swift code.
fun Koin.get(objCObject: ObjCObject): Any {
    return get(objCObject, null)
}

fun Koin.get(objCObject: ObjCObject, qualifier: Qualifier?): Any {
    val kClazz = when (objCObject) {
        is ObjCClass -> getOriginalKotlinClass(objCObject)!!
        is ObjCProtocol -> getOriginalKotlinClass(objCObject)!!
        else -> {
            throw IllegalArgumentException("Koin.get objObject must be a class or a protocol")
        }
    }
    return get(kClazz, qualifier, null)
}
// endregion.

[Adam Brown]

awesome, thanks!

[Adam Brown]

so DependencyListDirectory is a global you set some where to Koin's instance?

[wbertan]

yes, is from the Koin method startKoin, which returns the KoinApplication and then we store the koinApplication.koin

[Adam Brown]

great, thanks for clearing that up

[wbertan]

👍 I touched a little in our blog post: https://medium.com/clearscore/drivescore-kmm-journey-episode-iii-issues-and-solutions-a83f58234b2
There I focused in the interop with Dagger, but shows a little there in how we start Koin in both platforms too.
And other issues we had, in case you face similar things.

[Adam Brown]

oh wow great, ya we're some some prototyping right now at work, evaluating KMM, the KMM/Android story has been pretty good (compared to when I tried it about a year ago) but the KMM/iOS story has been less smooth so far