swift的基本使用（5）类和枚举

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

import UIKit

//枚举
//enum 枚举名： 类型{
// case 分支名1 = 赋值1
// case 分支名2 = 赋值2
//}

enum PersonIndentity : String{
case Teacher = “Teacher_id”
case Student = “Student_id”
}

//类
class Person {
var indentity : PersonIndentity?
var name: String?
var sex: String

//类的构造器init (name:String, sex:String, idd:PersonIndentity){    self.name = name    self.sex = sex    self.indentity = idd}//方法func hello() {    println("hello \(self.name)")}class func hello2() {    println("hello word")}//类型属性 只能是计算属性class var home: String {    get{        return "地球"    }}

}
//使用枚举时， 枚举名.类型
//也可以进行简化 .类型
//var student = Person(name: “dj”, sex: “f”, idd: PersonIndentity.Student)
var student = Person(name: “dj”, sex: “f”, idd: .Student)
//枚举值的获得
//代表枚举分支的行
student.indentity?.hashValue
//代表枚举分支具体的值
student.indentity?.rawValue
student.hello()
Person.hello2()
Person.home

//继承
class Student: Person {
var classNumber: Int
init(name: String, sex: String, idd: PersonIndentity, classNumber: Int) {
//子类的特有属性要在super.init前面进行赋值
self.classNumber = classNumber
super.init(name: name, sex: sex, idd: idd)

}func helloStudent () {    println("子类方法")}//重写父类方法 需要使用override关键字override func hello() {    println("重写父类方法")}override class func hello2() {    println("重写父类类型方法")}

}

//协议
protocol OneProtocol {
func typeFunc()
static func typeFunc2()
// class func typeFunc3()

mutating func typeFunc4()

}

//继承协议，实现方法的时候，要根据结构体或类本身的语法做出调整，不能仅依靠提示
struct StructNew : OneProtocol {
func typeFunc() {

}static func typeFunc2() {}func typeFunc4() {}

}

class ClassNew: OneProtocol{
func typeFunc() {

}class func typeFunc2() {}func typeFunc4() {}

}

//若想实现方法可选实现，需要使用optional关键字，optional关键字实现条件是必须是@objc的协议， eg:@objc protocol
//但此时 协议不能被结构体继承
@objc protocol TwoProtocol{
optional func typeFunc3()
}

//struct StrucNew2: TwoProtocol {
//
//}

//如果同时继承协议和父类，父类需要写在前面
class ClassNew2:ClassNew, TwoProtocol{

}

//延展
var studentEX = “stu”
extension Person {
func hello5(){

}//延展不能添加存储属性，只能添加计算属性//var stu2: String = "jhhkk"var stu2 :String {    get{        return studentEX    }    set{        studentEX = newValue    }}//convenience 扩展类的构造器的时候，涂药添加关键字convenience init(name:String, sex:String, idd:PersonIndentity, stu:String) {    self.init(name:name, sex: sex, idd: idd)    self.stu2 = stu}

}

var person = Person(name: “hj”, sex: “f”, idd: PersonIndentity.Student, stu: “djj”)
person.stu2 = “ggg”
person.stu2