vedon

 func testFeature2() {
    let dependencies: Feature2.Dependencies = AnyInitializer(Feature2.Dependencies.init).resolve(by: container)

    let f2 = Feature2(dependencies: dependencies)

    f2.doSomething()
}

output:
Test Case '-[DITests.DITests testFeature2]' started.

vedon

import FeatureService

extension Feature1: Feature1Service {
    public func doSomething() {
        print("Feature1 do something")
    }
}

vedon

import Foundation
import FeatureService

public class Feature2 {
    public struct Dependencies {
        let feature1: Feature1Service
        let feature3: Feature3Service
        
        public init(feature1: Feature1Service, feature3: Feature3Service) {
            self.feature1 = feature1

vedon

class AppContext {
    let container: DIContainer
    
    init() {
        self.container = DIContainer.init()
        ServiceAssembly.assembled(in: container)
    }
}

vedon

import Foundation
import Swinject

public typealias DIContainer = Container

public final class AnyInitializer {
    private let resolve:(_ container: DIContainer) -> Any
    public init<D1, D2, T>(_ function: @escaping (D1, D2) -> T) {
        resolve = { container in
            let d1: D1 = container.resolve(D1.self)!

vedon

class LoginViewController {
  private let userSession: UserSession
  
  init(_ userSession: UserSession = UserSession()) {
    self.userSession = userSession
  }
}

let vc = LoginViewController()
let vc = LoginViewController(userSession)

vedon

protocol Service {}
Class ServiceLocator {
   func register(_ service: Service, for type: ServiceType)
   func resolve(_ type: ServiceType)
}

ServiceLocator.shared.register(UserSession(), type: UserService.self)

Struct UserService: Service {}

vedon

Class UserSession {
   static let shared: UserSession
}

Class LoginViewController {
  
  func login(_ name: String, password: String) {
     ...
     UserSession.shared.login(name, password)
     ...

vedon

typealias Login = (_ name: String, _ password: String) -> Void

class LoginViewController {
  func login(_ login: Login, name: String, password: String) {
    ...
    login(name, password)
    ...
  }
}

vedon

class LoginViewController {
  var userSession: UserSession?
  
  
  func login(_ userName: String, password: String) {
    userSesson?.login(userName, password)
  }
}