Can an enum contain another enum values in Swift?

Question

I\'d like to share some enum properties. Something like:

enum State {
  case started
  case succeeded
  case failed
}

enum ActionState {
  include State //          


        

Answer 1

Details

• Swift 4, 3
• Xcode 10.2.1 (10E1001), Swift 5 (Last revision of this post)

Solution

enum State {
    case started, succeeded, failed
}

enum ActionState {
    case state(value: State), cancelled
}

class Action {
    var state: ActionState = .state(value: .started)
    func set(state: State) { self.state = .state(value: state) }
    func cancel() { state = .cancelled }
}

Full Sample

Do not to forget to paste the solution code

import Foundation

extension Action: CustomStringConvertible {
    var description: String {
        var result = "Action - "
        switch state {
            case .state(let value): result += "State.\(value)"
            case .cancelled: result += "cancelled"
        }
        return result
    }
}

let obj = Action()
print(obj)
obj.set(state: .failed)
print(obj)
obj.set(state: .succeeded)
print(obj)
obj.cancel()
print(obj)

Result

//Action - State.started
//Action - State.failed
//Action - State.succeeded
//Action - cancelled