Описание тега abaddressbook

The ABAddressBook opaque type (whose instances are known as address books) provides a programming interface to the Address Book—a centralized database used by multiple applications to store personal information about people. The Address Book database also supports the notion of a “group” containing one or more persons. People may belong to multiple groups, and groups may also belong to other groups.

The ABAddressBook opaque type provides functions for creating references to the Address Book database, saving changes, discarding changes, and registering for changes made externally (by other threads or processes) to the database.