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Categories

A category is declared in much the same way as a class. The interface file that declares the class must be imported:

#import "ClassName.h"

@interface ClassName ( CategoryName ) < protocol list >

method declarations

@end

The protocol list and method declarations are optional. If any protocols are listed, the header files where they’re declared must also be imported.

Like a class definition, a file containing a category definition imports its own interface:

#import "CategoryName.h"

@implementation ClassName ( CategoryName )

method definitions

@end

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