iphone - NSNotificationCenter for AddressBook db -


i want identify address book changes in app using nsnotificationcenter how use please me.

i don't understand problem is, if want notified when address book modified externally, use 

cferrorref error = nil; abaddressbookref contacts = abaddressbookcreatewithoptions (null, &error); if (contacts != nil) {     abaddressbookregisterexternalchangecallback (contacts,                                                  addressbookchangedexternally,                                                  (__bridge void *)(self)                                                  ); }

which assumes object implements code (self) implements function (not method) 

void addressbookchangedexternally(abaddressbookref abref, cfdictionaryref dicref, void *context)

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