如何使用iv & key和cryptoswift进行AES解密？

import Cryptoswift

func aesDecrypt(ciphertext: [UInt8], key: [UInt8], iv: [UInt8]) -> [UInt8]? {
    guard let aes = try? AES(key: key, blockMode: CBC(iv: iv), padding: .pkcs7) else {
        return nil
    }
    guard let decrypted = try? aes.decrypt(ciphertext) else {
        return nil
    }
    return decrypted
}

// 示例用法
let ciphertext: [UInt8] = [ /* 密文 */ ]
let key: [UInt8] = [ /* 密钥 */ ]
let iv: [UInt8] = [ /* 初始化向量 */ ]

if let decryptedData = aesDecrypt(ciphertext: ciphertext, key: key, iv: iv) {
    let decryptedString = String(bytes: decryptedData, encoding: .utf8)
    print("解密结果：\(decryptedString ?? "")")
} else {
    print("解密失败")
}