CODEWITHSUNDEEP
swiftunicode
Ethan
Ethan

Reputation: 471

swift how to convert special unicode

let result = ["response": response,
              "callbackId": callbackId]

do {
    let data = try NSJSONSerialization.dataWithJSONObject(result, options: .PrettyPrinted)
    var str = NSString(data: data, encoding: NSUTF8StringEncoding) as? String

    str = str?.stringByReplacingOccurrencesOfString("\\", withString: "\\\\")
    str = str?.stringByReplacingOccurrencesOfString("\"", withString: "\\\"")
    str = str?.stringByReplacingOccurrencesOfString("\'", withString: "\\\'")
    str = str?.stringByReplacingOccurrencesOfString("\n", withString: "\\n")
    str = str?.stringByReplacingOccurrencesOfString("\r", withString: "\\r")
    //                            str = str?.stringByReplacingOccurrencesOfString("\f", withString: "\\f")
    //                            str = str?.stringByReplacingOccurrencesOfString("\u2028", withString: "\\u2028")
    //            str = str?.stringByReplacingOccurrencesOfString("\u2029", withString: "\\u2029")

    return "bridge.invokeJs('{\"response\" : {\"username\" : \"zhongan\"},\"callbackId\" : \(callbackId)}')"
} catch {
    return nil
}

I want to convert the json string to js script, and then call evaluateJavaScript, but can not convert the special character, like \f \u2029, this will give a compiler error and I don't know why.

Upvotes: 0

Views: 1302

Answers (1)

andih
andih

Reputation: 5623

Have a look at Strings and Characters Section Special Characters in String Literals.

According to this page \f is not defined.

  • The escaped special characters \0 (null character), \ (backslash), \t (horizontal tab), \n (line feed), \r (carriage return), \" (double quote) and \' (single quote)

  • An arbitrary Unicode scalar, written as \u{n}, where n is a 1–8 digit hexadecimal number with a value equal to a valid Unicode code point

So

  • \f Form Feed you may be written in escaped form as \u{000C}
  • \u2029 Page Feed has to be escaped as \u{2029}
  • \u2028 Line Separator has to be escaped as \u{2028}

See also "Unicode Control Characters"

Upvotes: 7

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