Swift 系统学习 30 枚举 结构体 类 遵循协议 protocol

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

import 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.On

var 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, ProtocolName
class 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
}
}