交换字符串大小写 - swift

问题描述

let str = "tHIS is A test"
let swapped_case = "This IS a TEST"

Swift noob在这里，如何编程第二个语句？

Swift noob here, how to do the second statement programatically?

推荐答案

此函数适用于以Unicode定义的所有大写/小写字符
，即使是来自外国语言如Ä或ć的语言：

This function works with all upper/lowercase charactersdefined in Unicode, even those from "foreign" languages such as Ä or ć:

func swapCases(str : String) -> String {
    var result = ""
    for c in str { // Swift 2: for c in str.characters {
        let s = String(c)
        let lo = s.lowercaseString
        let up = s.uppercaseString
        result += (s == lo) ? up : lo
    }
    return result
}

let str = "tHIS is a test ÄöÜ ĂćŒ Α" // The last character is a capital Greek Alpha
let swapped_case = swapCases(str)
println(swapped_case)
// This IS A TEST äÖü ăĆœ α

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