Model - View - Intention (MVI)

User.swift

struct User {
  var id: String
  var username: String

}

extension User: ServiceLogics {

  static func loadUser(id: String) -> Promise<User> { ... }
  static func loadUserFromDB(id: String) -> Promise<User> { ... }
}

UserListCellIntent.swift

protocol UserListCellIntentLogics {
  
  func didTapUser()
}

class UserListCellIntent: UserListCellIntentLogics {
  
  weak var view: UserListCellNodeDisplayLogics?
  weak var repository: UserListRepository?
  
  func didTapUser() {
    let user = User.loadUser(id: id)
    user.then {
           UserListCellViewState(user: $0)
        }
        .done {
           view?.state($0) 
        }
    
    user.then {
           repository.replace(user: $0)
        }
  }
}

UserListCellNode.swift

protocol UserListCellNodeDisplayLogics {
   func state(viewState: UserListCellViewState)  
}

class UserListCellNode: ASCellNode {
 
  var usernameTextNode = ASTextNode()
  
  var intent: UserListCellIntentLogics = UserListCellIntent()
  
  override init() {
    super.init()
    intent.view = self
  }
  
  func state(viewState: UserListCellViewState) {
    usernameTextNode.attributedText = viewState.username.attributeText()
  }
  
  @objc func didTapUser() {
     self.intent.didTapUser() 
  }
}

UserListRepository.swift

class UserListRepository {
  
  var userSequence: [User] = [] 
  
  func append(user: User) { ... }
  func delete(id: String) { ... }
  func append(users: [User]) { ... }
  func replace(user: User) { ... }
}