||Mac OS X 10.0
class enumerates the contents of a
collection. Instances of this class are created by the collection
classes, generally with the method
declares the method reverseObjectEnumerator, and
keyEnumerator as additional methods that create
instances of NSEnumerator.
To obtain the next object in an enumerator, we invoke the method
nextObject. This will return an object, and
advance the enumerator position forward in the collection. When the
enumerator has exhausted the collection,
nextObject returns nil.
Enumerators cannot be reset; once you have enumerated a collection,
you must obtain an new enumerator from the collection to start again.
The method allObjects is used to return an
NSArray of the objects that have not yet been
enumerated. See Chapter 2 for more information on
collections and enumerators.
@interface NSEnumerator : NSObject
// Instance Methods
- (NSArray *)allObjects;