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" Hello Sir, I am working on an iOS application(client/server based) in which at a point after taking the permission from user i am accessing users contact list(AddressBook) to synch it with Server.Right now i am doing at ever time application lunch.But i want to synch my contact only when my app get a notification change in Users Contact List(AddressBook) "

"After a lots of Searching i got that,ABAddressBookRegisterExternalChangeCallback can help me ,but please someone tell me how i use it in my code,i mean the implementation of ABAddressBookRegisterExternalChangeCallback in actual code"

atul awasthi
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1 Answers1

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Please find my answer here which worked for me. This may need some enhancements, but it works.

Community
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