Inject into Swift

Koject supports KMM projects, allowing you to share code between Android and iOS. This document explains how to use the dependencies provided by Kotlin in your Swift code.

Getting Started

To call Koject from Swift, you need to define the necessary actions in Kotlin.

First, create a KojectHelper object in the iosMain folder and add a start function for initialization.

src/iosMain/kotlin/KojectHelper.ios.kt

object KojectHelper {
    fun start() {
        Koject.start()
    }
}

Next, in the entry point with the @main attribute in Swift, call KojectHelper.shared.start() to start Koject.

MyApp.swift

import SwiftUI
import shared

@main
struct MyApp: App {
    init() {
        KojectHelper.shared.start()
    }
    
    var body: some Scene {
        /* ... */
    }
}

Define the necessary dependencies in Kotlin and provide them using @Provides.

src/commonMain/kotlin/SampleRepository.kt

@Provides
@Singleton
class SampleRepository

src/commonMain/kotlin/SampleViewModel.kt

@Provides
class SampleViewModel(
    private val repository: SampleRepository
)

Add the necessary dependencies on the Swift side to KojectHelper as shown below.

src/iosMain/kotlin/KojectHelper.ios.kt

object KojectHelper {
    fun start() {
        Koject.start()
    }

    fun injectSampleViewModel(): SampleViewModel {
        return inject()
    }
}

You can use it by calling KojectHelper.shared.injectSampleViewModel() in Swift.

SampleState.swift

import shared

class SampleState {
    private let viewModel = KojectHelper.shared.injectSampleViewModel()
}