How to get notified in contact changed event in IOS? [duplicate]

Question

I wants to get notified when there is insert/update event to contacts of iPhone.

Is it possible to get notification to my app regarding specific contact changed event happened ?

Just a newbie... for IOS Swift.

I am not expecting full source code. Just wants to know whether its possible or not and also hint.

Thanks in advance.

Answer 1

From iOS 9 you can register your class to observe CNContactStoreDidChangeNotification

NSNotificationCenter.defaultCenter().addObserver(
    self,
    selector: #selector(addressBookDidChange),
    name: NSNotification.Name.CNContactStoreDidChange,
    object: nil)

And then:

@objc func addressBookDidChange(notification: NSNotification){     
    //Handle event here...
}

as reported in Contacts Framework Reference

After a save is successfully executed, the contact store posts a CNContactStoreDidChangeNotification notification to the default notification center. If you cache any Contacts framework objects you need to refetch those objects, either by their identifiers, or with the predicates that were used to originally fetch them, and then release the cached objects. Note that cached objects are stale, but not invalid.

EDIT:

Note that Address Book and Address Book UI frameworks are now deprecated.

Answer 2

In iOS it could be done using -

Register the external change call back notifier-

ABAddressBookRef ntificationaddressbook = ABAddressBookCreate();
    ABAddressBookRegisterExternalChangeCallback(ntificationaddressbook, MyAddressBookExternalChangeCallback, self);

Implement the call back -

void MyAddressBookExternalChangeCallback (ABAddressBookRef ntificationaddressbook,CFDictionaryRef info,void *context)
{
    // called when there is any change in AddressBook
}

For more details you can refer this link-

Detect what was changed from ABAddressBookRegisterExternalChangeCallback