Swift에서 배우는 Factory Method 패턴【Swift Design Pattern】

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소스 코드

// 通貨の説明
protocol CurrencyDescribing {
    var symbol: String { get }
    var code: String { get }
}

final class Euro: CurrencyDescribing {
    var symbol: String {
        return "€"
    }
    var code: String {
        return "EUR"
    }
}

final class UnitedStatesDolar: CurrencyDescribing {
    var symbol: String {
        return "$"
    }
    var code: String {
        return "USD"
    }
}

enum Country {
    case unitedStates
    case spain
    case uk
    case greece
}

struct CurrencyFactory {
    static func currency(for country: Country) -> CurrencyDescribing? {
        switch country {
        case .spain, .greece:
            return Euro()
        case .unitedStates:
            return UnitedStatesDolar()
        default:
            return nil
        }
    }
}

import UIKit

class ViewController: UIViewController {

    let noCurrencyCode = "No Currency Code Available"

    override func viewDidLoad() {
        super.viewDidLoad()
        let greece = CurrencyFactory.currency(for: .greece)?.code ?? noCurrencyCode // "EUR"
        let spain = CurrencyFactory.currency(for: .spain)?.code ?? noCurrencyCode "EUR"
        let unitedStates = CurrencyFactory.currency(for: .unitedStates)?.code ?? noCurrencyCode // "USD"
        let uk = CurrencyFactory.currency(for: .uk)?.code ?? noCurrencyCode // "No Currency Code Available"
    }
}

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