swift Tuples

概述TuplesTuples 可以用一对圆括号包裹若干个值，这些值的类型可以互不相同。例如, (404, "Not Found") 就可以表示一个HTTP状态码.let http404Error = (404, "Not Found")http404Error 的类型是 (Int, String), 他等于 (404, "Not Found")Tuples中可以包含任意类型你可以像

TuplesTuples 可以用一对圆括号包裹若干个值，这些值的类型可以互不相同。例如,(404,"Not Found") 就可以表示一个http状态码.let http404Error = (404,"Not Found")http404Error 的类型是 (Int,String),他等于 (404,"Not Found")Tuples中可以包含任意类型你可以像下面这样赋值let (statusCode,statusMessage) = http404Errorprint("The status code is \(statusCode)")// 输出 "The status code is 404"print("The status message is \(statusMessage)")// 输出 "The status message is Not Found"如果只需要Tuples中部分值，其他不需要的值可以用 _ 代替例如：let (justTheStatusCode,_) = http404Errorprint("The status code is \(justTheStatusCode)")// 输出 "The status code is 404"你也可以通过下标来获取值，下标从0开始例如：print("The status code is \(http404Error.0)")// 输出 "The status code is 404"print("The status message is \(http404Error.1)")// 输出 "The status message is Not Found"你可以给Tuple中个元素取个名字例如：let http200Status = (statusCode: 200,description: "OK")这样你就可以直接通过名字获取元素print("The status code is \(http200Status.statusCode)")// 输出 "The status code is 200"print("The status message is \(http200Status.description)")// 输出 "The status message is OK"Tuples 可以作为函数的值返回

原文 Tuples
https://developer.apple.com/library/prerelease/content/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html#//apple_ref/doc/uid/TP40014097-CH5-ID309

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