同步ABAddressbook条目

void ABAddressBookRegisterExternalChangeCallback (
   ABAddressBookRef addressBook,
   ABExternalChangeCallback callback,
   void *context
);

NSArray *allPeople = (NSArray *)ABAddressBookCopyArrayOfAllPeople(yourAddressBook);

for (int i = 0; i < allPeople.count; i++) {
    ABRecordRef *person = (ABAddressBookRef *)[allPeople abjectAtIndex:i];

    NSDate *lastModiDate = (NSDate*)ABRecordCopyValue(person, kABPersonModificationDateProperty);
    NSLog(@\"Last modification date: %@ of entry: %@\", lastModiDate, person);
}