Protected methods in objective-c

Question

What is the equivalent to protected methods in objective-c? I want to define methods which only the derived classes may call/implement.

Answer 1

Taken from this link -

"You can neither declare a method protected or private. Objective-C's dynamic nature makes it impossible to implement access controls for methods. (You could do it by heavily modifying the compiler or runtime, at a severe speed penalty, but for obvious reasons this is not done.)"