Swift 系统学习 30 枚举 结构体 类 遵循协议 protocol

//: Playground - noun: a place where people can playimport UIKit/* * 本节主要内容: * 1.枚举 / 结构体 / 类遵循协议 */protocol Togglable {    mutating func toggle() // 没有大括号}// OnOffSwitch枚举类型遵循了Togglable协议enum OnOffSwitch: Togglable {    case Off    case On        mutating func toggle() {        switch self {        case .Off:            self = .On        case .On:            self = .Off        }    }}var switchOne = OnOffSwitch.Onvar array: Array<Int> = []protocol FullNamed {    // 属性: var + 类型 + get / get set    var fullName: String { get } // { get set }    // 自定义方法    func randomValue() -> Int    // 类型方法(和类型属性对应)    static func someTypeMethod()    // mutating关键词的方法    mutating func changeName(newName: String)}struct Person: FullNamed {    // ***如果协议的属性是只读, 结构体遵循协议, 属性没有任何要求     // 存储属性    var fullName: String {        get {            return ""        }        set {                    }    }    var firstName: String?    func randomValue() -> Int {        return Int(arc4random()%50)    }    static func someTypeMethod() {         print("Call the someTypeMethod.")    }    mutating func changeName(newName: String) {        fullName = newName    }}Person.someTypeMethod()protocol Pet {    var name: String { get set }    var birthPlace: String { get }    func playWith()    func fedWith(food: String)    func changeName(newName: String)}// class Dog: SuperClass, ProtocolNameclass Dog: Pet {    private var myDoggyName = "Puppy"    var name: String {        get { return myDoggyName  }        set { myDoggyName = newValue }    }        var birthPlace: String = "Beijing"    func playWith() {        print("Play with it for a while.")    }    func fedWith(food: String = "Bone") {        if food == "Bone" {            print("Happy")        } else {            print("Unhapy")        }    }    func changeName(newName: String) {        name = newName    }}/* * 思考问题: 假设没有声明Pet宠物协议; 声明Pet类, 让dog类继承于Pet */import UIKit/* * 本节内容: 实现笔记中的流程图 */protocol Pet {    var name: String { get set }}protocol Flyable {    var flySpeed: Double { get }    var flyHeight: Double { get }}class Animal {    }class Dog: Animal, Pet {    var name: String = "Puppy"}class Cat: Animal, Pet {    var name: String = "Kitty"}class Bird: Animal, Flyable {    var flySpeed: Double    var flyHeight: Double    init(flySpeed: Double, flyHeight: Double) {        self.flySpeed  = flySpeed        self.flyHeight = flyHeight    }}class Parrot: Bird, Pet {    var name: String    init(name: String, flySpeed: Double, flyHeight: Double) {        self.name = name        super.init(flySpeed: flySpeed, flyHeight: flyHeight)    }}class Sparrow: Bird {    var color = UIColor.gray}class Vehicle {    }class Plane: Vehicle, Flyable {    var flySpeed: Double    var flyHeight: Double    init(flySpeed: Double, flyHeight: Double) {        self.flySpeed  = flySpeed        self.flyHeight = flyHeight    }}