Question

I’m trying to integrate the facebook-ios SDK 3.0 into my app – and I’m using rails/devise as the back end of my app to manage users.

Right now I’m trying to derive a custom class of FBSessionTokenCachingStrategy as suggested here

The issue is when I try to inherit this class in a subclass like this:

#import <Foundation/Foundation.h>
#import <FacebookSDK/FacebookSDK.h>

@interface CustomFBSessionTokenCachingStrategy : FBSessionTokenCachingStrategy

@end

I get the following error “Attempting to use the forward class ‘FBSessionTokenCachingStrategy’ as superclass of ‘CustomFBSessionTokenCachingStrategy'”

This might be a really silly error on my part – and if so I apologise – but I’m stuck as to why I cannot inherit this class! If someone could point me in the right direction here I would be very grateful!

Thanks in advance!

Answer 1

FBSessionTokenCachingStrategy.h is not included in FacebookSDK.h.
You need to add its import:

#import <Foundation/Foundation.h>
#import <FacebookSDK/FBSessionTokenCachingStrategy.h>

@interface CustomFBSessionTokenCachingStrategy : FBSessionTokenCachingStrategy

@end