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[iOS8] Swiftで全文字列を小文字・大文字に変換する方法

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Swiftで文字列を小文字・大文字に変換する方法をサンプルコードを利用して説明します。

大文字に変換:uppercaseString

let str      = "ABcdefg"           // "ABcdefg"
let bigStr   = str.uppercaseString // "ABCDEFG"

小文字に変換:lowercaseString
let str      = "ABcdefg"           // "ABcdefg"
let smallStr = str.lowercaseString // "abcdefg"
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