@class May I know the proper use of this

Question

Anyone can point out a documentation or a detailed discussion using @class. I\'ve been using this but haven\'t really fully understood it. I want to learn more about it and

Answer 1

// header.h
#import 
@class reference;

@interface class
...
@end
// implementation.m
#import "header.h"
#import "reference.h"

@implementation class
...
@end

you use this when you have a class that is referenced circularly between multiple files, and you import the header that contains the class described by the @class directive, and you can safely refer to the class circularly.