unknown type name in objective c

Question

I\'m pretty new to objective c, and having some basic problems.

I wrote a simple program using a navigator, and everything worked fine. then I added few lines of cod

Answer 1

@JustAStranger and @NathanielSymer, both are correct!

Anyway, worth remember that this case, below, has the same problem too:

Class_A.h: #import "Class_B.h"

Class_B.h: #import "Class_C.h"

Class_C.h: #import "Class_A.h"

This problem reveal to us how important is take care about owners at our Class relationships. Is very easy creates cycle problems using ObjC headers.