swift版的枚举变量

swift版的枚举变量

swift的枚举类型跟普通的类是极为类似的,使用的时候,请不要以为他是一个常量,以下是测试用源码

//
//  ViewController.swift
//  SwiftEnum
//
//  Created by YouXianMing on 15/10/9.
//  Copyright © 2015年 ZiPeiYi. All rights reserved.
//

import UIKit

enum Planet: Int {

    case Mercury = , Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
}

enum CompassPoint: String {

    case North, South, East, West
}

enum Barcode {

    case UPCA(Int, Int, Int, Int)
    case QRCode(String)
}

enum MinionIndex: Int {

    case DAVE, BOB, JERRY, JORGE, KEVIN, MARK, PHIL, STUART, TIM

    static let minionNames = [

        DAVE   : "Dave",
        BOB    : "Bob",
        JERRY  : "Jerry",
        JORGE  : "Jorge",
        KEVIN  : "Kevin",
        MARK   : "Mark",
        PHIL   : "Phil",
        STUART : "Stuart",
        TIM    : "Tim"]

    func minionName() -> String {

        if let minionName = MinionIndex.minionNames[self] {

            return minionName

        } else {

            return "Minion"
        }
    }

    func minionImage() -> UIImage? {

        return UIImage(named: "Minion\(minionName())")
    }
}

class ViewController: UIViewController {

    override func viewDidLoad() {

        super.viewDidLoad()

        normalExample()

        planetExample()

        compassPointExample()

        barcodeExample()

        minionIndexExample()
    }

    func normalExample() {

        let vegetable = "red pepper"

        switch vegetable {

        case "celery":
            print("Add some raisins and make ants on a log.")

        case "cucumber", "watercress":
            print("That would make a good tea sandwich.")

        case let x where x.hasSuffix("pepper"):
            print("Is it a spicy \(x)?")

        default:
            print("Everything tastes good in soup.")
        }
    }

    func planetExample() {

        if let planet : Planet = Planet(rawValue: ) {

            // switch 操作
            switch planet {

            case .Mercury:
                print("\(planet) \(planet.rawValue)")

            case .Earth:
                print("\(planet) \(planet.rawValue)")

            case .Neptune:
                print("\(planet) \(planet.rawValue)")

            default:
                print("\(planet) \(planet.rawValue)")
            }

        } else {

            // 没有这个枚举值
            print("no value")
        }
    }

    func compassPointExample() {

        if let compassPoint : CompassPoint = CompassPoint(rawValue: "Kxo") {

            // switch 操作
            switch compassPoint {

            case .North:
                print("\(compassPoint) \(compassPoint.rawValue)")

            case .West:
                print("\(compassPoint) \(compassPoint.rawValue)")

            default:
                print("\(compassPoint) \(compassPoint.rawValue)")
            }

        } else {

            // 没有这个枚举值
            print("no value")
        }
    }

    func barcodeExample() {

        let barCode = Barcode.UPCA(, , , )

        switch barCode {

        case .UPCA(, , , ):
            print("YES")

        default:
            print("NO")
        }
    }

    func minionIndexExample() {

        print(MinionIndex.DAVE.minionImage())
    }
}

rawValue类型的枚举类型

可以带参数,可以带方法

非 rawValue 类型