is there @protected method?

Question

I want to declare a method in a BaseObject, and this method only implemented by the SubObject, how can I do that? I found @protected is permitted to be used on method.

Answer 1

One way around this is to create a private header file containing a private interface category, like this:

//MyClass.h

@interface MyClass : NSObject

- (void)publicMethod;

@end

//MyClass_private.h

@interface MyClass ()

- (void)protectedMethod;

@end

MyClass.m and it's subclasses import the regular and _private headers, giving the _private declarations the same scope as protected. Customers of the hierarchy use only the regular headers.