Hello everyone. I am building a KMM project and am using `Koin` for DI. Everything works fine on :an...

# multiplatform

[Djuro]

Hello everyone. I am building a KMM project and am using Koin for DI. Everything works fine on 🤖
I just want to get the repository inside the viewModel, Screen or whichever class. There I use

let repository: Repository = Koin.instance.get()

In iOSMain I got the following bridge in file called KoinIOS.kt

import com.russhwolf.settings.NSUserDefaultsSettings
import com.russhwolf.settings.Settings
import kotlinx.cinterop.ObjCClass
import kotlinx.cinterop.getOriginalKotlinClass
import org.koin.core.Koin
import org.koin.core.KoinApplication
import org.koin.core.parameter.parametersOf
import org.koin.core.qualifier.Qualifier
import org.koin.dsl.module
import platform.Foundation.NSUserDefaults

object KoinIOS {
    fun initialize(
        userDefaults: NSUserDefaults,
    ): KoinApplication = initKoin(
        appModule = module {
            single<Settings> {
                NSUserDefaultsSettings(userDefaults)
            }
        }
    ) // swift doesn't bridge Kotlin functions with default parameters. This functions is to compensate for that limitation
}

fun Koin.get(objCClass: ObjCClass): Any {
    val kClazz = getOriginalKotlinClass(objCClass)!!
    return get(kClazz, null, null)
}

fun Koin.get(objCClass: ObjCClass, qualifier: Qualifier?, parameter: Any): Any {
    val kClazz = getOriginalKotlinClass(objCClass)!!
    return get(kClazz, qualifier) { parametersOf(parameter) }
}

actual val platformModule = module {}

I have Koin.swift file on iOS side in order to adapt it on iOSApp

import shared

final class Koin {
  private var core: Koin_coreKoin?

  static let instance = Koin()

  static func start() {
    if instance.core == nil {
      let app = KoinIOS.shared.initialize(
        userDefaults: UserDefaults.standard
      )
      instance.core = app.koin
    }
    if instance.core == nil {
      fatalError("Can't initialize Koin.")
    }
  }

  private init() {
  }

  func get<T: AnyObject>() -> T {
    guard let core = core else {
      fatalError("You should call `start()` before using \(#function)")
    }

    guard let result = core.get(objCClass: T.self) as? T else {
      fatalError("Koin can't provide an instance of type: \(T.self)")
    }

    return result
  }
}

Error I am getting at the moment is when I call Koin.instance.get() and then it tries to execute

guard let result = core.get(objCClass: T.self) as? T else {fatalError("Koin can't provide an instance of type: \(T.self)")  }

Thread 1: EXC_BAD_ACCESS (code=1, address=0x310)

Someone please help, I don’t know why this is happening

[Kevin S]

Maybe it’s from this line val kClazz = getOriginalKotlinClass(objCClass)!! force unwrapping

[Djuro]

Thanks Kevin, any idea how can I debug/check this? It kinda gives me nothing. I assume it just finds the error in compiled machine code sad panda

[Djuro]

when returning null there still doesn’t work and gives the same error

fun Koin.get(objCClass: ObjCClass): Any? {
    val kClazz = getOriginalKotlinClass(objCClass)
    return kClazz?.let { get(it, null, null) }
}

[Kevin S]

Theres an XCode plugin that helps with debugging https://github.com/touchlab/xcode-kotlin

[Djuro]

Thank you Kevin, I will check it out