在苹果钥匙链中存储和读取密码的简单方法？

import Foundation
import Security

func savePassword(service: String, account: String, password: String) -> OSStatus {
    let passwordData = password.data(using: .utf8)!
    
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrService as String: service,
        kSecAttrAccount as String: account,
        kSecValueData as String: passwordData
    ]
    
    SecItemDelete(query as CFDictionary)
    
    return SecItemAdd(query as CFDictionary, nil)
}

func readPassword(service: String, account: String) -> String? {
    let query: [String: Any] = [
        kSecClass as String: kSecClassGenericPassword,
        kSecAttrService as String: service,
        kSecAttrAccount as String: account,
        kSecReturnData as String: true
    ]
    
    var result: AnyObject?
    let status = SecItemCopyMatching(query as CFDictionary, &result)
    
    if status == errSecSuccess, let passwordData = result as? Data {
        return String(data: passwordData, encoding: .utf8)
    }
    
    return nil
}

// 示例代码的使用
let service = "com.example.app"
let account = "user@example.com"
let password = "password123"

let saveStatus = savePassword(service: service, account: account, password: password)
if saveStatus == errSecSuccess {
    print("Password saved successfully.")
}

if let savedPassword = readPassword(service: service, account: account) {
    print("Saved password: \(savedPassword)")
}