Geek

CellNode.swift

class CellNode {

  struct State {
    var id: Int
    var title: String?
    var isLike: Bool
  }

  public var state: State?
  weak var action: Action?
  
  public func update(_ state: State) {
  
  }
}

Intent.swift

class Action {

  func fetch(_ request: UseCase.Feed.Request) -> Promise<UseCase.Feed.Response> { ... }
}

Presenter.swift

class State {
  
  struct FeedState {
     var items: [Item]
     var isPagingEnded: Bool
  }
  
  struct Cell {
    var id: Int
    var title: String?
    var isLike: Bool
  }
  
  func feedState(_ response: UseCase.Feed.Response, oldState: State.Feed) -> Promise<State.Feed> { ... }
}

UseCase.swift

enum UseCase {
  
  enum Like {
    struct Request {
      var id: Int
      var isLike: Bool
    }
    struct Response {
      var item: Item
    }
  }

  enum Feed {
    struct Request {
      enum Scope {
        case reload
        case loadMore
      }
      
      var scope: Scope
    }
    struct Response {
      var items: [Item]
      var hasNextPage: Bool
    }   
  }
}

ViewController.swift

class ViewController {
 
   private var state: State!
   private var action: Action!
   
   public var viewState: State.Feed?
  
   public func update(_ state: State.Feed) {
   
   }
   
   @objc func reload() {
     let request = UseCase.Feed.Request.init(scope: .reload)
     intent.fetch(request)
           .then { state.feedState($0, oldState: self.state) }
           .done { [unowned self] newState in 
             self.update(newState)
           }
   }
}