Ios 在swift5中更新和删除密钥链时出现问题

我在更新和删除密钥链时遇到问题

public func clearKeychain(username: String) throws -> Any?{
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrAccount as String: username
    ]
    let status = SecItemDelete(query as CFDictionary)

    if status != errSecSuccess {
        throw KeychainError.unhandledError(status: status)
    }
    print("Clear Keychain")
    return status
}

public func updateKeychain(username: String, password: String) throws -> Any?{
    let credentials = Credentials.init(username: username, password: password)
    let data = credentials.password.data(using: .utf8)!

    // store password as data and if you want to store username
    let query: [String: Any] = [kSecClass as String:  kSecClassGenericPassword,
                                kSecAttrAccount as String: username,
                                kSecValueData as String: data]
    let fields: [String: Any] = [
        kSecAttrAccount as String: username,
        kSecValueData as String: data
    ]
    let status = SecItemUpdate(query as CFDictionary, fields as CFDictionary)
    guard status == errSecSuccess else {
        throw KeychainError.unhandledError(status: status) }
    print("Updated Password")
    return status
}

用法：

let _ = (try? keychain.clearKeychain(username: "KeychainUser")) as Any?
let _ = (try? keychain.updateKeychain(username: "KeychainUser", password: "123456789")) as Any?

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无法删除或更新密钥链。我在创建和获取钥匙链的价值方面没有问题，但在更新或删除钥匙链时遇到了问题。没有显示错误。状态返回零。

要更新和删除您的项目，您需要搜索特定类型的数据。所以您不需要在查询中传递数据。只需更新您的查询，如下所示将解决更新数据的问题

let query: [String: Any] = [kSecClass as String:  kSecClassGenericPassword]

默认情况下，keychain services删除所有匹配的keychain项 搜索参数。如果要删除要删除的特定项目 已经有对的引用或持久引用，请将其添加到 搜索字典作为kSecMatchItemList键的值。在这个 这样，您就可以将删除限制为只删除指定的项

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没有显示错误。当然不是因为您忽略了错误。并且

状态

值不是

任何

（甚至不是

任何？

），

状态

是一个整数，如果它不是零，则表示错误。它可以通过

SecCopyErrorMessageString

显示为可读字符串。无论如何，这两种方法的返回值都是毫无意义的。很高兴能帮助您。