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是否可以观察特定实体（特别是实体的计数）并在它发生变化时运行方法？

我正在使用Magical Data和Core Data。

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Yes. MagicalRecord does not inhibit an existing core data functionality. KVO is built into core data and you should be able to observe property changes just fine

于 2013-03-28T18:30:02.027 回答