How to implement AES encryption in swift

Parallel Android code is below:

public static String getEncryptedText(String plainText, SecretKey secretKey) { if(plainText == null) { plainText = ""; } try { byte[] ivBytes = new byte[GCM_IV_LENGTH]; SecureRandom random = new SecureRandom(); random.nextBytes(ivBytes); String iv = Base64.getEncoder().encodeToString(ivBytes);

        byte[] cipherText = encrypt(plainText.getBytes(), secretKey, ivBytes);
        String text = Base64.getEncoder().encodeToString(cipherText);
        text = iv+text;
        return text;
    } catch (Exception e) {
        e.printStackTrace();
        return "";
    }
}


private static byte[] encrypt(byte[] plaintext, SecretKey key, byte[] nonce) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
    Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
    SecretKeySpec keySpec = new SecretKeySpec(key.getEncoded(), "AES");
    GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(GCM_TAG_LENGTH * 8, nonce);