Swift: get the Mac UUID

getMacUUID.swift

func getSystemUUID() -> String? {
  let dev = IOServiceMatching("IOPlatformExpertDevice")
  let platformExpert: io_service_t = IOServiceGetMatchingService(kIOMasterPortDefault, dev)
  let serialNumberAsCFString = IORegistryEntryCreateCFProperty(platformExpert, kIOPlatformUUIDKey as CFString, kCFAllocatorDefault, 0)
  IOObjectRelease(platformExpert)

  guard let ser: CFTypeRef = serialNumberAsCFString?.takeUnretainedValue() else { return nil }

  if let result = ser as? String {
      return result
  }

  return nil
}

if let uuid = getSystemUUID() {
  print(uuid)
}