Swift

//: Playground - noun: a place where people can play

import UIKit

/*
这里的枚举没有给它的成员默认值, 而是给它绑定了一个类型, 
之后可以在程序中对这些成员进行赋值
*/
enum Barcode
{
    case UPCA(Int, Int, Int, Int)       // 条形码
    case QRCode(String)                 // 二维码
}

// 示例
let productCodeA = Barcode.UPCA(4, 102, 245, 8)
let productCodeB = Barcode.QRCode("This is a QRCodeInfomation")

switch productCodeA {
case .UPCA(let systemNumber, let manufacture, let identifier, let check):
    print("UPC-A with value of (systemNumber), (manufacture), (identifier), (check)")
case .QRCode(let info):
    print(info)
}