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paperh18648 margl-907 margr0 margt0 margb0 fi0 ri0 ql sb0 f1 fs24 Copyright f3 'e3f1 1994 by NeXT Computer, Inc. All Rights Reserved.
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fs36 NSEnumerator
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fs28 f0 b fs24 Inherits From:tab b0 fs28 f1 NSObject
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fs28 s6 f0 b fs24 Conforms To:tab b0 fs28 f1 NSObject (NSObject)
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fs28 s7 f0 b fs24 Declared In:tab b0 fs28 f1 Foundation/NSUtilities.h
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fs28 Class Description
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fs28 NSEnumerator is a simple abstract class whose instances enumerate collections of other objects. Collection objects'd0such as NSSets, NSArrays, and NSDictionaries'd0provide NSEnumerator objects that can traverse their contents. You send b nextObjectb0 repeatedly to an NSEnumerator to have it return the next object in the collection. When there are no more objects to return, b nextObjectb0 returns b nilb0 .
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fs28 Collection classes include methods that return an enumerator appropriate to the type of collection. NSArray has two methods that return an NSEnumerator object, b objectEnumeratorb0 and b reverseObjectEnumeratorb0 (the former traverses the array starting at its first object, while the latter starts with the last object and continues backward through the array to the first object). NSSet'27s b objectEnumeratorb0 provides an enumerator for sets. NSDictionary has two enumerator-providing methods: b keyEnumeratorb0 and b objectEnumeratorb0 .
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fs28 pard s12 li477 fi0 ri1007 ql f0 b fs24 Note: b0 fs28 f1 Collections shouldn'27t be modified during enumeration. NSEnumerator imposes this restriction to improve enumeration speed.
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fs28 Traversing a Collection
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fs28 fi-6552 {f3 -} (id)b nextObjectb0 tab Returns the next object in the collection being enumerated (for example, an NSArray or NSDictionary). Returns b nilb0 when the collection has been traversed.
}These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.