Swift-類、結構體、枚舉

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001-枚舉

//枚舉 swift 中不會被賦於預設的整型值enum someEnumeration {    case north    case sourth    case east    case west}//多個成員值要寫在一行，用逗號隔開enum Planet {    case mercury,earth,mars}var directionHead = someEnumeration.west        directionHead = .east        //使用Switch匹配單個的枚舉值        switch directionHead {        case .north:            print("north")        case .sourth:            print("sourth")        case .west:            print("west")        case .east:            print("east")        default:            print("None Of This Direction")        }

//枚舉關聯值

enum BarCode {    case upc(Int,Int,Int,Int) //根據數字識別商品    case qrCode(String)       //根據代碼識別商品}//建立一個條碼 var productBar = BarCode.upc(8, 8, 3, 4) productBar = .qrCode("ABCDE")//upc被qrCode代替

//枚舉原始值

//枚舉的原始值 隱士賦值enum ASCIIControlChar : Character {    case tab = "\t"    case lineFeed = "\n"    case carriageReturn = "\r"}//字串的預設值是枚舉值本身enum Planet:Int{    case mercury = 1,venus,earth,mars}//擷取枚舉變數的原始值     let earthOrder = Planet.earth.rawValue     print(earthOrder)//輸出結果為 3

//枚舉遞迴

//枚舉遞迴indirect enum Arithmetic {    case number(Int)    case addition(Arithmetic,Arithmetic)    case multiplication (Arithmetic,Arithmetic)}   //建立一個枚舉遞迴運算式   let five = Arithmetic.number(5)   let four = Arithmetic.number(4)   let sum = Arithmetic.addition(five, four)   let product = Arithmetic.multiplication(sum, five)    // (5+4) * 5    print(product)

//類

//類的聲明：class Student{    var name:String = ""    var age:Int = 18}//訪問屬性   classItem.name = "小子"   print(classItem.name)//小子

//結構體：

//結構體struct teacher {    var name:String = ""    var age:Int = 20}let myTeacher = teacher() print(myTeacher)//teacher(name: "", age: 20)

 

 

 

 

Swift-類、結構體、枚舉