十六进制字符串到文本的转换 - swift 3 [英] Hex string to text conversion - swift 3

问题描述

我正在尝试将十六进制字符串转换为文本.

I'm trying to convert an hex string to text.

这就是我所拥有的:

// Str to Hex
func strToHex(text: String) -> String {
    let hexString = text.data(using: .utf8)!.map{ String(format:"%02x", $0) }.joined()

   return "0x" + hexString

}

我正在尝试将刚刚创建的十六进制字符串反转回原始字符串.

and I'm trying to reverse the hex string that I've just created back to the original one.

例如:

let foo: String = strToHex(text: "K8") //output: "0x4b38"

我想做类似的事情

let bar: String = hexToStr(hex: "0x4b38") //output: "K8"

有人可以帮我吗?谢谢

推荐答案

你可能可以这样使用:

func hexToStr(text: String) -> String {

    let regex = try! NSRegularExpression(pattern: "(0x)?([0-9A-Fa-f]{2})", options: .caseInsensitive)
    let textNS = text as NSString
    let matchesArray = regex.matches(in: textNS as String, options: [], range: NSMakeRange(0, textNS.length))
    let characters = matchesArray.map {
        Character(UnicodeScalar(UInt32(textNS.substring(with: $0.rangeAt(2)), radix: 16)!)!)
    }

    return String(characters)
}

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