Updates an existing contact in the contact store.
- iOS 9.0+
- macOS 10.11+
- Mac Catalyst 13.0+
The contact to update.
The contact to be updated must already exist in the contact store. If it does not, the update request fails, the
CNError error occurs, and the
CNError array is updated to contain the object. Note that the contact may be modified when the save request is executing.