let us: Go! 행사에서 발표한 내용으로, Dependency Injection에 대해서 알아보고 Swift의 DI Framework인 Deli를 소개합니다.

18. class SuperRobotHand {}
class RobotHand {}
class Robot {
let hand: RobotHand = RobotHand()
}

19. class SuperRobotHand {}
class RobotHand {}
class Robot {
let hand: RobotHand = RobotHand()
}

20. protocol RobotHand {}
class NormalRobotHand: RobotHand {}
class SuperRobotHand: RobotHand {}
class Robot {
let hand: RobotHand = NormalRobotHand()
}

21. protocol RobotHand {}
class NormalRobotHand: RobotHand {}
class SuperRobotHand: RobotHand {}
class Robot {
let hand: RobotHand = NormalRobotHand()
}

24. protocol RobotHand {}
protocol RobotBody {}
class NormalRobotHand: RobotHand {}
class SuperRobotHand: RobotHand {}
class CoolRobotBody: RobotBody {}
class CuteRobotBody: RobotBody {}
class Robot {
init(hand: RobotHand, body: RobotBody) { ... }
}
class Factory {
func makeRobot() -> Robot {
return Robot(hand: SuperRobotHand(), body: CuteRobotBody())
}
}

25. class Factory {
func makeRobot() -> Robot {
return Robot(hand: SuperRobotHand(), body: CuteRobotBody())
}
}

26. class Robot {
/// Property Injection
let hand: RobotHand = NormalRobotHand()
/// Constructor Injection
init(body: RobotBody) {
self.hand = hand
self.body = body
}
}

28. class SeoulFactory {
let robot = Robot(
hand: SuperRobotHand(),
body: CuteRobotBody()
)
}
class IncheonFactory {
let robot = Robot(
hand: SuperRobotHand(),
body: CuteRobotBody()
)
}

30. IoC(Inversion of Control)를 구현하는 프레임워크로 객체를 관리하고,
객체의 생성을 책임지고, 의존성을 관리하는 컨테이너이다.

32. protocol RobotType {}
class Robot: RobotType { ... }
class SeoulFactory {
let robot = Container.get(RobotType.self)
}
class IncheonFactory {
let robot = Container.get(RobotType.self)
}

40. @UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
// weaver: movieManager = MovieManager <- MovieManaging
// weaver: movieManager.scope = .container
}
protocol MovieManaging {}
class MovieManager: MovieManaging {}

41. DEFINITIONS:
- service: MovieManaging
component: MovieManager

42. interface MovieManaging {}
@Component
class MovieManager() : MovieManaging {}

43. protocol MovieManaging {}
class MovieManager: MovieManaging, Component {}

46. protocol UserService {
func login(id: String, password: String) -> User?
func logout()
}
class UserServiceImpl: UserService, Component {
func login(id: String, password: String) -> User? {
...
}
func logout() {
...
}
init() {}
}

48. class LoginViewModel: Autowired {
let userService: UserService
required init(_ userService: UserService) {
self.userService = userService
}
}

49. class LoginViewModel: Autowired {
let userService: UserService
required init(_ userService: UserService) {
self.userService = userService
}
}

50. UserService
UserServiceImpl
LoginViewModel
IoC Container

52. class FriendListViewModel: Autowired {
func generateInfo(by id: String) -> FriendInfoViewModel? {
let friend = friendService.getFriend(by: id)
return Inject(
FriendInfoViewModel.self,
with: (
userID: friend.id,
cachedName: friend.name
)
)
}
}

53. class FriendListViewModel: Autowired {
func generateInfo(by id: String) -> FriendInfoViewModel? {
let friend = friendService.getFriend(by: id)
return Inject(
FriendInfoViewModel.self,
with: (
userID: friend.id,
cachedName: friend.name
)
)
}
}

54. class FriendPayload: Payload {
required init(
with argument: (userID: String, cachedName: String)
) { ... }
}
class FriendInfoViewModel: AutowiredFactory {
required init(
_ accountService: AccountService,
payload: FriendPayload
) { ... }
}

55. class FriendPayload: Payload {
required init(
with argument: (userID: String, cachedName: String)
) { ... }
}
class FriendInfoViewModel: AutowiredFactory {
required init(
_ accountService: AccountService,
payload: FriendPayload
) { ... }
}

56. class FriendPayload: Payload {
required init(
with argument: (userID: String, cachedName: String)
) { ... }
}
class FriendInfoViewModel: AutowiredFactory {
required init(
_ accountService: AccountService,
payload: FriendPayload
) { ... }
}