Hi, how can I do Koin injection in iOS side? Tried <https://medium.com/@uwaisalqadri/elegant-koin-in...

# multiplatform

[Hasan Nagizade]

Hi, how can I do Koin injection in iOS side? Tried https://medium.com/@uwaisalqadri/elegant-koin-injection-for-swift-in-kotlin-multiplatform-mobile-9a803f6efb2e and https://github.com/Kashif-E/KmMScientists/blob/master/iosApp/iosApp/Di/KoinModule.swift
both of them work fine but I would love to learn the best practise.

[Sam]

This is just my own approach, so no more authoritative than any blog post, but:

[Sam]

Kotlin shared:

/**
 * Multi-platform wrapper around Koin.
 * Provides an init method that can be called from each platform entrypoint, and Swift-compatible getters.
 */
object ServiceContainer : KoinComponent {
    var koinApplication: KoinApplication? = null
        private set

    /**
     * Initializes the Koin DI container
     *
     * @param [platformContext]
     * A platform-specific context object. On Android, this should be the app Context. On iOS it is unused.
     */
    fun start(platformContext: Any?) {
        if (koinApplication != null) return

        koinApplication = startKoin {
            useLogger()
            usePlatformContext(platformContext)
            modules(rootModule)
        }
    }

    fun start() {
        start(null)
    }
}

iOS Kotin:

/*Define extension methods on ServiceContainer for any values SwiftUI code might need to inject directly */
fun ServiceContainer.messageBus(): MessageBus = get()
//Etc...

SwiftUI:

//App is wrapped in this
struct WithServiceContainer<Content : View> : View {
    let content: () -> Content

    init(@ViewBuilder content: @escaping () -> Content) {
        self.content = content
        ServiceContainer.shared.start()
    }

    var body: some View {
        content()
    }
}

//Then just do e.g.
let messageBus: MessageBus = ServiceContainer.shared.messageBus()

[Kevin S]

In KaMPKit we use this https://github.com/touchlab/KaMPKit/blob/main/shared/src/commonMain/kotlin/co/touchlab/kampkit/Koin.kt
https://github.com/touchlab/KaMPKit/blob/main/ios/KaMPKitiOS/Koin.swift

In common code, we have a coreModule and then an expect / actual platformModule for iOS. Then we init koin from Swift

[Hasan Nagizade]

will try both of these thank you