Is there any way in iOS to get notification about address book changes since the last time applications was opened.
The application stores address book in internal database and I don't want to perform full sync each time it activated.
Thanks in advance.
Small addition to clarify the question: I use ABAddressBookRegisterExternalChangeCallback to observe changes when application suspended to background, but from what I know, this method can't work if application was closed completely and reopened(for example: after phone restart or closed from task list).
Maybe you're looking for this:
ABAddressBook Reference - ABAddressBookRegisterExternalChangeCallback
You should register that notification!
Tell me if worked or if you need any help
Mário
来源：https://stackoverflow.com/questions/12348916/addressbook-synchronization-in-ios