StackOverflow2013

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2013-10-22T14:53:43.110
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I had a similar issue. The callback would only be called once the first time, but if I went out and made changes to the addressbook a second time, then it would be called multiple times. For me, the problem was the method that held the <code>ABAddressBookRegisterExternalChangeCallback</code> was being called in the appDelegate's <code>applicationWillResignActive:</code> method. The way I was using the addressbook was for a sync setting. The problem was, I was registering the external callback everytime the sync settings were being saved, rather than only when the sync settings were being changed. To illustrate, here is the code I was calling in the appDelegate <pre><code>- (void)saveSettings { NSUserDefaults *syncSettingsData = [NSUserDefaults standardUserDefaults]; [syncSettingsData setObject:[NSNumber numberWithBool:self.isSyncingiPadContacts] forKey:SYNC_IPAD_CONTACTS_TURNED_ON]; [self setAddressBookChanged]; [syncSettingsData synchronize]; } - (void)setAddressBookChanged { if (self.isSyncingiPadContacts) { ABAddressBookRegisterExternalChangeCallback(self.addressBook, addressBookChanged, (__bridge void *)self); } else { ABAddressBookUnregisterExternalChangeCallback(self.addressBook, addressBookChanged, (__bridge void *) self); } } </code></pre> I removed the call to <code>setAddressBookChanged</code> in the <code>saveSettings</code> method, and just had it called when the addressbook was being created (first time set up) and whenever the user changed the sync settings. Hopefully this helps you.
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