Swift 枚举

//枚举语法enum CompassPoint {    case North    case South    case East    case West}//枚举语法enum Plant {    case Mercury, Venus, Earth, Mars}var aaa = CompassPoint.West//语句匹配枚举值let aaa = CompassPoint.Westswitch aaa {case .North:    println("\(1)")case .South:    println("\(2)")case .East:    println("\(3)")default:    println("\(0)")}enum Barcode {    case UPCA(Int, Int, Int, Int)    case QRCode(String)}var a = Barcode.UPCA(8, 8888, 888, 3)a = .QRCode ("abcd")