CleanSwift Example

DisplayCellNodeCASE_A.swift

class DisplayCellNode: ASCellNode {
 
  // UI
  let buttonNode = ASButtonNode()
 
  // Props
  weak var interactor: InteractorLogics!
  private var presenter: DisplayCellPresenter = .init()
 
  override func didLoad() {
    super.didLoad()
    buttonNode.addTarget(self, didTapButton:, .touchUpInside)
  }
 
  @objc func didTapButton() {
    // Request -> Response
    let response = interactor.didTapButton(id: "user-12345")
    
    // Response -> ViewModel
    let viewModel = response
        .then { [weak self] user in 
          return self?.username(user: user) ?? brokenPromise() 
        } 
        .recover { [weak self] error in
          return self?.errorMessage(error: error) ?? brokenPromise() 
        } 
   
   // ViewModel -> Rendering
   viewModel
        .done { [weak self] username in 
            self?.buttonNode.text = username
            self?.setNeedsLayout()
        }
  }
}

Interactor.swift

// TDD: Stub Testing 

protocol InteractorLogics {
  func didTapButton(id: String) -> Promise<User>
}

class Interactor: InteractorLogics {
  
  private var worker: WorkerLogics
  
  init(worker: WorkerLogics) {
   self.worker = worker 
  }
}

extension Interactor {
  
 func didTapButton(id: String) -> Promise<User> {
   return worker.getUser(id: id)
 }
}

Presenter.swift

// TDD: Stub Testing 

struct DisplayCellPresenter {
  
  func username(user: User) -> String {
    return user.username 
  }

  func errorMessage(error: Error) -> String {
    return error.errorMessage 
  }
}

Worker.swift

protocol WorkerLogics {
  func getUser(id: String) -> Promise<User>
}

class Worker: WorkerLogics {
 
  func getUser(id: String) -> Promise<User> {
   return service.get(API.user(id: userID)) 
  }
}

• 복잡한 기술적 기교를 줄이고
• 직관적이고 읽기 쉬운
• 적은 코드로 많은 테스트
• 버그 추적하기 쉬운