swift如何转换特殊的unicode

Question

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
}

我想将json字符串转换为js脚本,然后调用evaluateJavaScript,但不能转换特殊字符,就像\f \u2029,这会给编译器错误,我不知道为什么.

Answer 1

查看字符串文字中的字符串和字符部分特殊字符.

根据这个页面\f没有定义.

• 转义的特殊字符\ 0(空字符),\(反斜杠),\ t(水平制表符),\n(换行符),\ r \n(回车符),\"(双引号)和\'(单引号)

• 一个任意的Unicode标量,写为\ u {n},其中n是1-8位十六进制数,其值等于有效的Unicode代码点

所以

• \f Form Feed您可以以转义形式书写 \u{000C}
• \u2029 页面Feed必须转义为 \u{2029}
• \u2028 行分隔符必须转义为 \u{2028}

另请参见" Unicode控制字符 "