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【Swift2.x】指定した長さのランダムな文字列を出力する

Swift2.0

Last updated at 2016-01-08Posted at 2016-01-08

Swift 2.xで指定した長さのランダムな文字列を出力する（メモ）

サンプルメソッド

    func randomStringWithLength(length: Int) -> String {
        let alphabet = "-_1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
        let upperBound = UInt32(alphabet.characters.count)
        return String((0..<length).map { _ -> Character in
            return alphabet[alphabet.startIndex.advancedBy(Int(arc4random_uniform(upperBound)))]
            })
    }

実行例

        let str = randomStringWithLength(30)
        print(str)

実行結果

        V4B6ODMLAWnTIhTKS4OoPtprYs91uE

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