[Swift]元组-Tuples

来源：互联网发布：sql清除挂起工具编辑：程序博客网时间：2024/05/16 05:53

1、元组（tuple)是由多个值组成的复合值类型

let id = (7010,23,"htx","05\\10\\93"); //分别代表学号，年龄，姓名,出生年月

2、当你函数需要返回多个值时，元组这个时候非常有用，你可以使用下标方式访问元组中得值，如0..1以此类推，如下：

var number = id.0println(number)var age = id.1println(age)var name = id.2println(name)var birthdate = id.3println(birthdate)/*结果：701023htx05\10\93*/

3、为元组中每个元素命名：

let myid = (number:7010,age:23,name:"HTX",birthdate:"05\\10\\93")

4、增加格式化:

func format(idinput:(Int,Int,String,String))->String{    return "number is \(idinput.0) \n age is \(idinput.1) \n name is \(idinput.2) \n birthdate is \(idinput.3)"}println(format(myid))/*输出结果：number is 7010  age is 23  name is HTX  birthdate is 05\10\93*/

5、元组时可以分解的

let (numbers,ages,names,birthdates) = myidprintln("number is \(numbers) \n age is \(ages) \n name is \(names) \n birthdate is \(birthdates)")/*输出结果：number is 7010  age is 23  name is HTX  birthdate is 05\10\93*/

6、元组也可部分分解，忽略其他值，忽略的值用”_”代替即可

let (rel, _,res, _) = myidprintln("rel is \(rel) \n res is \(res)")/*输出结果：rel is 7010  res is HTX*/

0 0