---
title: "ABAddressBookRegisterExternalChangeCallback(_:_:_:)"
framework: addressbook
role: symbol
role_heading: Function
path: "addressbook/abaddressbookregisterexternalchangecallback(_:_:_:)"
---

# ABAddressBookRegisterExternalChangeCallback(_:_:_:)

Registers a callback to receive notifications when the Address Book database is modified.

## Declaration

```swift
func ABAddressBookRegisterExternalChangeCallback(_ addressBook: ABAddressBook!, _ callback: ABExternalChangeCallback!, _ context: UnsafeMutableRawPointer!)
```

## Parameters

- `addressBook`: The address book used to interact with the Address Book database.
- `callback`: The function to invoke when the Address Book database changes.
- `context`: The object to pass to the callback function.

## See Also

### Deprecated

- [ABAddressBookAddRecord(_:_:_:)](addressbook/abaddressbookaddrecord(_:_:_:).md)
- [ABAddressBookCopyArrayOfAllGroups(_:)](addressbook/abaddressbookcopyarrayofallgroups(_:).md)
- [ABAddressBookCopyArrayOfAllGroupsInSource(_:_:)](addressbook/abaddressbookcopyarrayofallgroupsinsource(_:_:).md)
- [ABAddressBookCopyArrayOfAllPeople(_:)](addressbook/abaddressbookcopyarrayofallpeople(_:).md)
- [ABAddressBookCopyArrayOfAllPeopleInSource(_:_:)](addressbook/abaddressbookcopyarrayofallpeopleinsource(_:_:).md)
- [ABAddressBookCopyArrayOfAllPeopleInSourceWithSortOrdering(_:_:_:)](addressbook/abaddressbookcopyarrayofallpeopleinsourcewithsortordering(_:_:_:).md)
- [ABAddressBookCopyArrayOfAllSources(_:)](addressbook/abaddressbookcopyarrayofallsources(_:).md)
- [ABAddressBookCopyDefaultSource(_:)](addressbook/abaddressbookcopydefaultsource(_:).md)
- [ABAddressBookCopyLocalizedLabel(_:)](addressbook/abaddressbookcopylocalizedlabel(_:).md)
- [ABAddressBookCopyPeopleWithName(_:_:)](addressbook/abaddressbookcopypeoplewithname(_:_:).md)
- [ABAddressBookCreate()](addressbook/abaddressbookcreate().md)
- [ABAddressBookCreateWithOptions(_:_:)](addressbook/abaddressbookcreatewithoptions(_:_:).md)
- [ABAddressBookGetAuthorizationStatus()](addressbook/abaddressbookgetauthorizationstatus().md)
- [ABAddressBookGetGroupCount(_:)](addressbook/abaddressbookgetgroupcount(_:).md)
- [ABAddressBookGetGroupWithRecordID(_:_:)](addressbook/abaddressbookgetgroupwithrecordid(_:_:).md)