The factory method pattern

let raidLeader = Card(name: "Raid Leader", mana: 3, attack: 2, defense: 2)

import UIKit
import Foundation

//Define what a card is
protocol Card {
  var name: String? {get set}
  var attack: Int? {get set}
  var defense: Int? {get set}
  var mana: Int? {get set}
  func clone() -> Card
  func toString() -> String
}

// AbstractCard
// implements the signature and some properties
class AbstractCard: NSObject, Card {
  private var _name: String?
  private var _mana: Int?
  private var _attack: Int?
  private var _defense: Int?
  
  init(name: String?, mana: Int?, attack: Int?, defense: Int?) {
    self._name = name
    self._attack = attack
    self._defense = defense
    self._mana = mana
    super.init()
  }
 
  override init(){
    super.init()
  }
  
  //property name
  var name: String?{
    get{ return _name }
    set{ _name = newValue }
  }
  
  //property mana
  var mana: Int? {
    get{ return _mana }
    set{ _mana = newValue }
  }
  
  //property attack
  var attack: Int? {
    get{ return _attack }
    set{ _attack = newValue }
  }
  
  //property attack
  var defense: Int? {
    get{ return _defense }
    set{ _defense = newValue }
  }
  
  func clone() -> Card {
    return AbstractCard(name: self.name, mana: self.mana, attack: self.attack, defense: self.defense)
  }
  
  func toString() -> String{
    return ("\(self.name, self.mana, self.attack,self.defense)")
  }
}

enum CardType {
  case FacelessManipulator, RaidLeader
}

// our Factory Class
// Depending what we need, this class return an instance of the 
// appropriate object.
class CardFactory{
  class func createCard(cardtype: CardType) -> Card?{
    
    switch cardtype {
    case .FacelessManipulator:
      return FacelessManipulatorCard()
    case .RaidLeader:
      return RaidLeaderCard()
    default:
      return nil
    }
  }
}

//Concrete Card "Raid Leader"
//This is the full definition of the Raid Leader Card
class RaidLeaderCard: AbstractCard {
  override init()
  {
    super.init()
    self._mana = 3
    self._attack = 2
    self._defense = 2
    self._name = "Raid Leader"
  }
}

//Concrete Card "Faceless Manipulator"
//this is the full definition of the FacelessManipulator Card.
class FacelessManipulatorCard: AbstractCard {
  override init()
  {
    super.init()
    self._mana = 5
    self._attack = 3
    self._defense = 3
    self._name = "Faceless Manipulator"
    
  }
}

//simulate our client

var c = CardFactory.createCard(.FacelessManipulator)
c?.toString()