adam-leitgeb / DependencyHolder-iOS

A lightweight dependency injection library for Swift.

DependencyHolder

A lightweight dependency injection library for Swift that implements Inversion of Control (IoC) for resolving dependencies.

DependencyHolder helps your app split into loosely-coupled components, which can be developed, tested and maintained more easily. DependencyHolder is powered by the Swift generic type system and first class functions to define dependencies of your app.

Usage

Create a dependency

protocol TestUseCase: Dependency {
}

final class MockTestUseCase: TestUseCase {
}

final class ProductionTestUseCase: TestUseCase {
}

Insert dependency into dependency holder

let dependencyHolder = DependencyHolder()

let testUseCase = ProductionTestUseCase()
dependencyHolder.add(TestUseCase.self, constructor: testUseCase)

Obtain the dependency where needed

final class TestViewModel: ObservableObject {

    let testUseCase: TestUseCase
    
    init(dependencyHolder: DependencyHolder) {
        testUseCase = dependencyHolder.get()
    }
}