我有一个允许用户兑换优惠券代码的应用程序，但是我想限制它，以便他们每 30 分钟只能领取一个。
因此，我不知何故需要存储他们上次兑换优惠券的时间，如果他们尝试兑换另一张优惠券，该应用程序会检查最后一次，如果最后一张是半小时前，则只会给他们一张新优惠券。
我会将数据存储在用户首选项中还是有更好的方法？
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Storing a timestamp of when the last voucher was redeemed in NSUserDefaults is probably fine for a simple solution.
But how secure do you need this to be? As a general rule, and especially if this needs to be strictly enforced for financial reasons, never trust the client. Meaning that you should have a server to verify the codes, and enforce usage restrictions.
于 2013-06-14T19:51:56.680 回答