Monday, November 4, 2013

What is Category?

Category is an objective-c feature which allows to add additional methods to a class for which we don't have source code.We can add additional methods to classes like NSString,NSArray etc.

Any methods that you declare in a category will be available to all instances of the original class, as well as any subclasses of the original class. At runtime, there’s no difference between a method added by a category and one that is implemented by the original class.

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