Swift Keychain SecItemUpdate返回errSecParam

我可以将项目添加到钥匙链，甚至可以读出它们

然而，我正在努力使用

SecItemUpdate

更新一个值，并且似乎每次都返回errSecParam

为此，我创建了以下查询和属性（这里很可能是个问题）

然后用于更新

---

SecItemUpdate（查询为CFDictionary，属性为CFDictionary）

应该在查询中指定类，而不是数据（用于更新），因此，例如，要在密钥链中添加/更新密码，应该如下所示

// adding item
let addQuery: [CFString: Any] = [
    kSecClass: kSecClassGenericPassword,
    kSecAttrService: service as CFString,        // eg. "www.mysite.com"
    kSecAttrAccount: name as CFString            // eg. "user"
    kSecValueData: password.data(using: .utf8)   // eg. "password"
] as CFDictionary

if errSecSuccess != SecItemAdd(addQuery, nil) { 
    // report error here
}

// updating item (same query is for SecItemDelete)

let updateQuery: [CFString: Any] = [
    kSecClass: kSecClassGenericPassword,
    kSecAttrService: service as CFString,        // eg. "www.mysite.com"
    kSecAttrAccount: name as CFString            // eg. "user"
] as CFDictionary

let newAttributes = [
    kSecAttrAccount: newName as CFString            // eg. "user1"
    kSecValueData: newPassword.data(using: .utf8)   // eg. "password1"
] as CFDictionary

if errSecSuccess != SecItemUpdate(updateQuery, newAttributes) {
   // report error here
}

// adding item
let addQuery: [CFString: Any] = [
    kSecClass: kSecClassGenericPassword,
    kSecAttrService: service as CFString,        // eg. "www.mysite.com"
    kSecAttrAccount: name as CFString            // eg. "user"
    kSecValueData: password.data(using: .utf8)   // eg. "password"
] as CFDictionary

if errSecSuccess != SecItemAdd(addQuery, nil) { 
    // report error here
}

// updating item (same query is for SecItemDelete)

let updateQuery: [CFString: Any] = [
    kSecClass: kSecClassGenericPassword,
    kSecAttrService: service as CFString,        // eg. "www.mysite.com"
    kSecAttrAccount: name as CFString            // eg. "user"
] as CFDictionary

let newAttributes = [
    kSecAttrAccount: newName as CFString            // eg. "user1"
    kSecValueData: newPassword.data(using: .utf8)   // eg. "password1"
] as CFDictionary

if errSecSuccess != SecItemUpdate(updateQuery, newAttributes) {
   // report error here
}