创建后立即从钥匙串中读取项目

Question

我正在使用我的应用程序中的自定义钥匙串，我在添加新钥匙链项目后立即阅读钥匙串项目时遇到问题。这是代码示例：

let path = "/tmp/testkeychain_48"
let password = "password"
let serviceName = "service"
let account = "account"
let data = "data".data(using: .utf8)
var keychain: SecKeychain? = nil

var status = SecKeychainCreate(path, UInt32(password.characters.count), password, false, nil, &keychain)
assert(status == errSecSuccess)

var query: [String: AnyObject] = [
    kSecClass as String: kSecClassGenericPassword,
    kSecAttrService as String: serviceName as AnyObject,
    kSecAttrAccount as String: account as AnyObject,
    kSecValueData as String: data as AnyObject,
    kSecUseKeychain as String: keychain as AnyObject,
]

var item: CFTypeRef? = nil
status = SecItemAdd(query as CFDictionary, &item)
assert(status == errSecSuccess)
assert(item != nil)

query = [
    kSecClass as String: kSecClassGenericPassword,
    kSecAttrService as String: serviceName as AnyObject,
    kSecAttrAccount as String: account as AnyObject,
    kSecMatchLimit as String: kSecMatchLimitAll as AnyObject,
    kSecUseKeychain as String: keychain as AnyObject,
]

status = SecItemCopyMatching(query as CFDictionary, &item)
assert(status == errSecSuccess)
assert(item != nil)

try? FileManager.default.removeItem(atPath: path)

SecItemAdd(_:_)返回成功，但SecItemCopyMatching(_:_)失败，错误为The specified item could not be found in the keychain。使用默认钥匙串，一切正常。