我强烈建议您使用钥匙串——这正是 Facebook 用来存储会话令牌的方式.

I would highly recommend you use the keychain - it's exactly what Facebook do for storing their session tokens.

NSUserDefaults 不安全或不加密 - 它可以在设备上和同步到 Mac 时轻松打开和阅读.因此，虽然用户默认设置是首选项和配置信息等内容的好地方，但它不是任何敏感内容(如密码)的好地方.

NSUserDefaults is not secure or encrypted - it can be easily opened and read, both on device and when synced to a Mac. So whilst user defaults is a good place for things like preferences and config info, it's not a good place for anything sensitive, like passwords.

会话令牌几乎总是与密码一样对待，因此您应该将它们安全地存储在钥匙串中，并在那里进行加密.Apple 有一些示例代码(GenericKeychain)，显示了基本实现，以及您可以通过搜索 *** 找到其他示例.希望对您有所帮助.

Session tokens should almost always treated the same as passwords, so you should store them securely in the keychain, where they'll be encrypted. Apple have some sample code (GenericKeychain) that shows a basic implementation, and you'll find other examples by searching ***. Hope that's helped you out.