这里有一个在Swift中实现的方法-你需要Gzip和Light-Swift-Untar Swift包：

// JSON with base64 value which represents the tar.gz
if let type = resultDict["resultsData"] as? String {
  // create Data from the base64 string
  if let gzipData = Data(base64Encoded: type, options: .ignoreUnknownCharacters) {
    // check if isGzipped, from Gzip Swift pkg
    if gzipData.isGzipped {
        let ddata = NSData(base64Encoded: type)
        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
        let filePath = "\(documentsPath)/unpacked.tar"
        let url = URL(fileURLWithPath: filePath)
        do{
          // first decompress gzip and write the tar file, using Gzip Swift pkg
          try! gzipData.gunzipped().write(to: url, options: .atomic)
          // next use the Light-Swift-Untar FileManager extension to unarchive the tar
          try FileManager.default.createFilesAndDirectories(path: "\(documentsPath)/exxxtracted", tarPath: filePath)
        } catch let failedError {
          print("Failed to write the gzip data due to \(failedError.localizedDescription)")
        }
    }
  }
}

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