CNContactStoreDidChangeNotification is fired multiple times

Question

I am able to observe the CNContactStoreDidChangeNotification when the contact database is changed while the app is in background state. I am pretty sure that on

Answer 1

I had the same problem, the number of times it fired varied between 2 & 3. The solution that worked for me was to set a semaphore variable, set in the handler and reset the semaphore when finished. Wrap the address book processing in an if statement on the semaphore to ignore further calls. addressBkSemphore is reset to false in buildFrendsAndContacts

- (void)addressBkChange:(NSNotification *)note
{   
    if (addressBkSemphore == false)
    {
        addressBkSemphore = TRUE;
        [self buildFrendsAndContacts];
    }
}

Hope it helps.