I found information about the ABAddressBookRegisterExternalChangeCallback(::_:) function of the Address Book Framework, but that function has been deprecated, and only works with iOS 2.0–9.0. I don't see a function in the Contacts Framework that does what that function does. Is there some way that the Contacts Framework could do something that this function provided a solution for?
What to use instead of the deprecated ABAddressBookRegisterExternalChangeCallback(::_:) function?
Did you search ?
Found this:
or possibly this one: