objective c - Properties for Class and Its Subclasses Only

Question

Is it possible to define properties that are only available to the class they are defined in, and that class's subclasses?

Stated another way, is there a way to define protected properties?

Answer 1

Technically, no. Properties are really just methods, and all methods are public. The way we "protect" methods in Objective-C is by not letting other people know about them.

Practically, yes. You can define the properties in a class extension, and still @synthesize them in your main implementation block.