Function to check whether the device is Jail broken or not

Device_JailBroken.swift

 fileprivate func isDeviceJailbroken() -> Bool {
    let cydiaPath = "/Applications/Cydia.app" //Cydia is an alternative to Apple's App Store for "jailbroken" devices
    if FileManager.default.fileExists(atPath: cydiaPath) {
      return true
    }

    let protectedPath = "/private/jailbreak.test"
    do {
      try "0".write(toFile: protectedPath, atomically: true, encoding: String.Encoding.utf8)
      return true
    } catch {
      return false
    }
  }