Swift Tour随笔总结(2)
浏览数：21 /
时间：2015年06月08日
Type Aliases
typealias AudioSample = UInt16Booleans
非boolean值不会被替代为bool，例如：
let i = 1
if i {
// this example will not compile, and will report an error
}Tuples
例如：HTTPStatus Code ("404", "Not Found")
let http404Error = (404, "Not Found")
// http404Error is of type (Int, String)Access Tuple:
let (statusCode, statusMessage) = heep404Error
println("This status code is \(statusCode)")
// prints "The status code is 404"
println("The statuis message is \(statusMessage)")
// prints "The status message is Not Found"简写，使用 _ 代替不需要的变量，例如：
let (justTheStatusCode, _) = http404Error
println("The status code is \(justTheStatusCode)")
// prints "The status code is 404"另一种access tuple的方法：
println("The status code is \(http404Error.0)")
// prints "The status code is 404"
println("The status message is \(http404Error.1)")
// prints "The status message is Not Found"Tuple的完整define
let http200Status = (statusCode: 200, description: "OK")对应的access
println("The status code is \(http200status.statusCode)")
println("The status code message is \(http200status.description)")郑重声明：本站内容如果来自互联网及其他传播媒体，其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享，并不代表本站赞同其观点和对其真实性负责，也不构成任何其他建议。
