问题描述
我知道我可以使用类别扩展"(即@interface NSMutableArray (MyExtension))子类化" NSMutableArray，以向该类添加新功能.但是，有没有一种方法可以使用类别扩展将新的 properties 添加到扩展中?
I know that I can "subclass" an NSMutableArray using "category extensions," i.e. @interface NSMutableArray (MyExtension), to add new functions to the class. However, is there a way using category extensions to also add new properties to the extension?
推荐答案
请注意，@interface NSMutableArray (MyStuff)是类别，而不是类扩展.在这种情况下，它们是相似的，但实际上有很多不同的细节.
Note that @interface NSMutableArray (MyStuff) is a category and not a class extension. They are similar in this context, but actually do have quite a few different details.
您不能通过任何一种机制将存储添加到现有类.您可以使用关联参考来但是，将数据与实例相关联.
You can't add storage to an existing class through either mechanism. You can use Associative References to associate data with an instance, though.
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