Swift:有没有办法将签名保存到点数串中？

import Security

func saveSignatureToKeychain(signature: Data) {
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrAccount as String: "signature",
        kSecValueData as String: signature
    ]
    
    let status = SecItemAdd(query as CFDictionary, nil)
    if status != errSecSuccess {
        print("Failed to save signature to Keychain")
    }
}

import Security

func retrieveSignatureFromKeychain() -> Data? {
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrAccount as String: "signature",
        kSecReturnData as String: true
    ]
    
    var result: AnyObject?
    let status = SecItemCopyMatching(query as CFDictionary, &result)
    
    if status == errSecSuccess, let data = result as? Data {
        return data
    } else {
        print("Failed to retrieve signature from Keychain")
        return nil
    }
}