swift Unicode转码

extension String {
    var unicodeStr:String {
        let tempStr1 = self.replacingOccurrences(of: "\\u", with: "\\U")
        let tempStr2 = tempStr1.replacingOccurrences(of: "\"", with: "\\\"")
        let tempStr3 = "\"".appending(tempStr2).appending("\"")
        let tempData = tempStr3.data(using: String.Encoding.utf8)
        var returnStr:String = ""
        do {
            returnStr = try PropertyListSerialization.propertyList(from: tempData!, options: [.mutableContainers], format: nil) as! String
        } catch {
            print(error)
        }
        return returnStr.replacingOccurrences(of: "\\r\\n", with: "\n")
    }
}

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