Question

尝试在安全链中添加项目时，请继续获取-50。

    var query = [String:AnyObject]()
    query[kSecClass as String] = kSecClassGenericPassword
    query[kSecAttrAccount as String] = "a"
    query[kSecValueData as String] = "b"
    let result = SecItemAdd(query as CFDictionary, nil);

结果是-50。无法弄清楚原因，需要帮助..提前谢谢。

Answer 1

我认为<%= link_to "Back to Top", '#top_of_blogs_list' %>密钥的值必须是NSData，而不是String或NSString。尝试将字符串编码为数据（例如使用UTF-8编码）。未经测试的代码段：

kSecValueData

为了将来参考，错误代码-50对应于query[kSecValueData as String] = "b".dataUsingEncoding(NSUTF8StringEncoding)，SecBase.h头文件的含义为：“传递给函数的一个或多个参数无效。”如果再次看到此错误，请尝试使用查询字典更改传入的值。

Answer 2

稍作更新的Swift 5版本的“添加/删除钥匙串”功能：

@discardableResult
func addToKeychain(_ value: Data, tag: Data) -> Bool {
    let attributes: [String: Any] = [
        String(kSecClass): kSecClassKey,
        String(kSecAttrApplicationTag): tag,
        String(kSecValueData): value
    ]

    var result: CFTypeRef? = nil
    let status = SecItemAdd(attributes as CFDictionary, &result)
    if status == errSecSuccess {
        print("Successfully added to keychain.")
    } else {
        if let error: String = SecCopyErrorMessageString(status, nil) as String? {
            print(error)
        }

        return false
    }

    return true
}

@discardableResult
func removeFromKeychain(_ value: Data, tag: Data) -> Bool {
    let attributes: [String: Any] = [
        String(kSecClass): kSecClassKey,
        String(kSecAttrApplicationTag): tag,
        String(kSecValueData): value
    ]

    let status = SecItemDelete(attributes as CFDictionary)
    if status == errSecSuccess {
        print("Successfully removed from keychain.")
    } else {
        if let error: String = SecCopyErrorMessageString(status, nil) as String? {
            print(error)
        }

        return false
    }

    return true
}

可以这样使用：

let value: Data = "key".data(using: .utf8)!
let tag: Data = "com.test.key".data(using: .utf8)!

removeFromKeychain(value, tag: tag)
addToKeychain(value, tag: tag)

secItemAdd在swift中保持返回-50错误

2 个答案: