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If you can't get an object with objectAtIndex: from an NSSet then how do you retrieve objects?
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An object representing a dynamic, unordered, uniquing collection, for use instead of a Set variable in cases that require reference semantics.
An object representing a static, unordered collection of unique objects.
Creating NSArray Objects Using Array Literals In addition to the provided initializers, such as initWithObjects: , you can create an NSArray object using an array literal. In Objective-C, the compiler generates code that makes an underlying call to the init(objects:count:) method.
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.
A set is appropriate when you don't want duplicates, don't care about order, and want fast membership testing.
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NSSet doesn't have a method objectAtIndex:
Try calling allObjects which returns an NSArray of all the objects.
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