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Can anybody tell me when to use categories and when to use subclassing in Objective-C? Also please tell me the advantages and disadvantages of them.
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Subclassing : If we want to modify state as well as behaviour of any class or override any methods to alter the behaviour of the parent class then we go for subclassing.
In inheritance, a class (usually called superclass) is inherited by another class (usually called subclass). The subclass adds some attributes to superclass. Below is a sample Python program to show how inheritance is implemented in Python. # Base or Super class.
The process of creating a subclass of a class is called inheritance. All the attributes and methods of superclass are inherited by its subclass also. This means that an object of a subclass can access all the attributes and methods of the superclass.
Definitions: A class that is derived from another class is called a subclass (also a derived class, extended class, or child class). The class from which the subclass is derived is called a superclass (also a base class or a parent class).
An objective-c category is useful if you want to alter the behavior of ALL instances of the class, with minimal code. Subclassing is more useful if you want to alter the behavior of only certain instances, and retain the original method for others.
Categories can be dangerous, especially if you cannot view the source of the original method, so you should generally use subclasses on third-party and private frameworks rather than a category.
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