从 Keychain 中检索帐户名称

Question

我想在钥匙串中保存和检索密码和用户帐户。我在 stackoverflow 中找到了一个解决方案，并在那里使用了代码。 Save and Load from KeyChain | Swift。但是这段代码只保存和加载密码而不是帐户名。我想我知道如何保存 accountName 但我需要弄清楚如何将它与密码一起加载。这是代码，可以节省您进入该链接的时间。

var userAccount = "AuthenticatedUser"
let accessGroup = "SecurityService"

// Mark: User defined keys for new entry
// Note: add new keys for new secure item and use them in load and save methods
let accountKey = "KeyForAccount"
let passwordKey = "KeyForPassword"

private class func save(service: String, data: String) {
        let dataFromString: NSData = data.data(using: String.Encoding(rawValue: String.Encoding.utf8.rawValue), allowLossyConversion: false)! as NSData

        //Instantiate a new default keychain query
        let keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, userAccount, dataFromString], forKeys: [kSecClassValue, kSecAttrServiceValue as NSCopying, kSecAttrAccountValue as NSCopying, kSecValueDataValue as NSCopying])

        //Add new keychain item
        let status = SecItemAdd(keychainQuery as CFDictionary, nil)
        if status != errSecSuccess {  //Always check status
            print("Write failed. Attempting update.")
            //updatePassword(token: data)
        }
    }
 private class func load(service: String) -> String? {
        //Instantiate a new default keychain query
        //Tell the query to return a result
        //Limit our results to one item
        let keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, userAccount, kCFBooleanTrue, kSecMatchLimitOneValue], forKeys: [kSecClassValue, kSecAttrServiceValue as NSCopying, kSecAttrAccountValue as NSCopying, kSecReturnDataValue as NSCopying, kSecMatchLimitValue as NSCopying])

        var dataTypeRef: AnyObject?

        //Search for the keychain items
        let status : OSStatus = SecItemCopyMatching(keychainQuery, &dataTypeRef)
        var contentsOfKeychain: String? = nil

        if status == errSecSuccess {
            if let retrieveData = dataTypeRef as? Data {
                contentsOfKeychain = String(data: retrieveData as Data, encoding: String.Encoding(rawValue: String.Encoding.utf8.rawValue))
            }
        } else {
            print("Nothing was retrieved from the keychain. Status code \(status)")
        }
            print(contentsOfKeychain ?? "none found")
            return contentsOfKeychain   
    }

完整的代码在链接内。谢谢大家。

Answer 1

但此代码只保存和加载密码而不是帐户名。

您显示的代码不会保存或加载密码或帐户名。

你有两个功能，一个是保存键/值对，一个是加载键的值。调用这两个函数的方式决定了保存/加载的内容。

您在代码中的某处调用save 来保存密码，您还需要调用save（使用不同的密钥）来保存帐户名。 load 也是如此。您的代码确实定义了要使用的两个键（accountKey 和 passwordKey）。

HTH