What is a category in Objective C and when is it used?

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Likewise, people ask, how do you add a category in Objective C?

To add a category, go to File -> New File…, and select “Objective-C category” from the “Cocoa Touch” tab under iOS. This will bring up an additional window, where you can name the Category in the “Category” textfield. You then type or select the class you want to add it to, and it will output 2 very simple files.

Also Know, what is posing in Objective C? Objective-C Posing. Objective-C permits a class to wholly replace another class within a program. The replacing class is said to "pose as" the target class. For the versions that supported posing, all messages sent to the target class are instead received by the posing class.

Hereof, what is the difference between category and extension in Objective C?

Categories are an Objective-C language feature that let you add new methods to an existing class. Extensions are a special case of categories that let you define methods that must be implemented in the main implementation block.

What is category in iOS?

A category allows you to add methods to an existing class—even to one for which you do not have the source. Categories are a powerful feature that allows you to extend the functionality of existing classes without subclassing.