Swift_构造过程(指定构造器、convenience便利构造器、可失败构造器 init?(...))

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class Iland {    var fish : Double    init(setFish fish2:Double) {        fish = 11.3    }}struct Hotal {    var waiter:Double    init(waiter2:Double) {        waiter = waiter2    }}//2struct Miss {    let c,d,e:Int    init(c:Int,d:Int,e:Int) {        self.c = c        self.d = d        self.e = e    }}//3 指定构造器 和 便利构造器class Food {    var name: String    init(name: String) {        self.name = name    }    //便利构造器    convenience init() {        self.init(name: "[Unnamed]")    }}//枚举类型构造器import UIKitenum Dog {    case Keep,Log,Min        init?(inChar:Character) {        switch inChar {        case "k":            self = .Keep                case "L":            self = .Log                    case "M":            self = .Min                default:            return nil                    }    }}class ViewController: UIViewController {    override func viewDidLoad() {        super.viewDidLoad()                //1        var b = Iland(setFish: 2345)                //2        var t = Hotal(waiter2: 345)                //3        let f = Food.init()                        //4        var d = Dog.init(inChar: "M")                    }}

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