The definition of a custom area for organizing related records in a database.
- iOS 8.0+
- macOS 10.10+
- tvOS 9.0+
- watchOS 3.0+
Zones are an important part of how you organize your data. The public, private and shared databases have a single default zone. In the private database you can use
CKRecord objects to create additional custom zones as needed. Use custom zones to arrange and encapsulate groups of related records in the private database. Custom zones support other capabilities too, such as the ability to write multiple records as a single atomic transaction.
Treat each custom zone as a single unit of data that is separate from every other zone in the database. Inside the zone, you add records as you would anywhere else. You can also create links between the records inside a zone by using the
CKReference class. However, the
CKReference class does not support cross-zone linking, so each reference object must point to a record in the same zone as the current record.
CKRecord class as-is and do not subclass.
Creating a Custom Record Zone
For the most part, you use instances of this class to create and manage custom zones. Although you can use this class to retrieve a database’s default zone, most operations act on records in the default zone by default, so you rarely need to specify it explicitly.
To create a custom zone, use
CKRecord to create the zone object, and then save that zone to the user’s private database using a
CKModify object. You cannot save any records in the zone until you save it to the database. When creating records, explicitly specify the zone ID if you want the records to reside in a specific zone; otherwise, they will be saved to the default zone. You cannot create custom zones in a public database.
After creating a
CKRecord object and saving it to the database, you do not interact with the object much. Instead, most interactions occur with its associated
CKRecord object, which you use to refer to the zone when creating records.