Swift5

//定义协议

protocol SomeprotocolOne{

func printSomething()

}

protocol SomeprotocolTwo{

}

class SomeClass{

}

//采纳协议

class SomeClassOne:SomeClass,SomeprotocolOne,SomeprotocolTwo{

func printSomething() {

print("Hello World")

}

}

//属性要求//get set 可读可写 get可读 set可写

protocol FullNamed{

var fullname: String {get}

}

class SpellName: FullNamed{

var prefix: String?

var name: String?

init(name:String,prefix:String?=nil){

self.name = name

self.prefix = prefix

}//自定义初始化方法

var fullname:String {

return(prefix != nil ? prefix! + "":"")+name!

}

}

let name = SpellName(name: "阳菜", prefix: "小嶋")

print(name.fullname)

//方法要求

protocol SomeProtocolThree{

static func someTypeClass()

func sum() -> Double

}

protocol Conters {

func sum() -> Double

}

class sumOfThreeNumber:Conters{

var numOne = 0.0

var numTwo = 0.0

var numThree = 0.0

func sum() -> Double {

return numOne * numTwo * numThree

}

}

var sum = sumOfThreeNumber()

print(sum.sum())

sum.numOne = 9.0

sum.numTwo = 23.32

sum.numThree = 534

print(sum.sum())

protocol Toggable{

mutating func toggable()

}

//mutating 在方法里去改变方法所属的实例

enum OnOFFSwitch:Toggable{

case on

case off

mutating func toggable() {

switch self{

case off:

self = on

case on:

self = off

}

}

}

var lightSwitch = OnOFFSwitch.on

lightSwitch.toggable()

//委托代理模式

protocol retentHose {

func Renting()

}

class LianJia:retentHose{

func Renting() {

print("我是家，我可以找房")

}

}

class Lisi:retentHose{

func Renting() {

print("我是李四，我可以找房")

}

}

class myHouse{

var houseDelegate:retentHose?

}

class WU8{

func renting() {

print("我是8，我可以找房")

}

}

var mine = myHouse()

var wu = WU8()

var lisi = Lisi()

var lianjia = LianJia()

mine.houseDelegate = lianjia

mine.houseDelegate?.Renting()

//扩展要求

protocol PrintText{

var textDescription:String{

get

}

}

protocol DrawPicture{

}

class Book : DrawPicture {

}

extension Book : PrintText{

var textDescription: String{

return "可以描述"

}

}