ios - Facebook SDK: Knowing if sharing took place -

i sharing link app using code hellofacebooksample, can't figure out how know if sharing took place. use sharing:

fbappcall *appcall = [fbdialogs presentsharedialogwithlink:urltoshare                                                       name:@"hello facebook"                                                    caption:nil                                                description:@"the 'hello facebook' sample application showcases simple facebook integration."                                                    picture:nil                                                clientstate:nil                                                    handler:^(fbappcall *call, nsdictionary *results, nserror *error) {                                                        if (error) {                                                            nslog(@"error: %@", error.description);                                                        } else {                                                            nslog(@"success!");                                                        }                                                        nslog(@"results: %@",results);                                                    }]; 

and works fine. problem accessing results dictionary. figured out need add app delegate:

- (bool)application:(uiapplication *)application             openurl:(nsurl *)url   sourceapplication:(nsstring *)sourceapplication          annotation:(id)annotation {   // attempt extract token url   return [fbappcall handleopenurl:url                 sourceapplication:sourceapplication                   fallbackhandler:^(fbappcall *call) {                     nslog(@"in fallback handler");                   }]; } 

otherwise handler isn't run @ all. weird thing in sample app results dictionary has 2 fields,

completiongesture = cancel; didcomplete = 1; 

but when use exact same code in own app, on same phone, dictionary contains

didcomplete = 1; 

why that, , there other way find out if user shared or cancelled?

see section here on can expect in result dictionary, , why values available:

https://developers.facebook.com/ios/share-dialog/#handling-responses