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What is the equivalent to protected methods in Objective-C? I want to define methods which only the derived classes may call/implement.
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There are two protected methods in Object : clone() and finalize() . finalize() is not intended to be called by client code, but may be overridden by subclasses - thus, it is protected.
A protected method is like a private method in that it can only be invoked from within the implementation of a class or its subclasses. It differs from a private method in that it may be explicitly invoked on any instance of the class, and it is not restricted to implicit invocation on self .
The method displayed in class A is protected and class B is inherited from class A and this protected method is then accessed by creating an object of class B.
Notes: You cannot declare a class as protected . Only the methods or fields within a class can have this access modifier.
You can simulate protected and private access to methods by doing the following:
These protections are not, as Sachin noted, enforced at runtime (as they are in Java, for example).
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