@class vs. #import

Question

It is to my understanding that one should use a forward-class declaration in the event ClassA needs to include a ClassB header, and ClassB needs to include a ClassA header t

Answer 1

if we do this

@interface Class_B : Class_A

mean we are inheriting the Class_A into Class_B, in Class_B we can access all the variables of class_A.

if we are doing this

#import ....
@class Class_A
@interface Class_B

here we saying that we are using the Class_A in our program, but if we want to use the Class_A variables in Class_B we have to #import Class_A in .m file(make a object and use it's function and variables).