问题描述
如果您无法从NSSet中获取objectAtIndex对象，那么如何检索对象？
If you can't get an object with objectAtIndex: from an NSSet then how do you retrieve objects?
推荐答案
是一组的几个用例。您可以枚举（例如使用或NSFastEnumeration），请调用测试对于成员资格，请使用获取成员（非随机），或将其转换为数组http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSSet_Class/Reference/Reference.html#//apple_ref/doc/uid/20000143-CHDDFHBE\"> allObjects 。
There are several use cases for a set. You could enumerate through (e.g. with enumerateObjectsUsingBlock or NSFastEnumeration), call containsObject to test for membership, use anyObject to get a member (not random), or convert it to an array (in no particular order) with allObjects.
当你不想要重复，不关心顺序，快速成员资格测试。
A set is appropriate when you don't want duplicates, don't care about order, and want fast membership testing.
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