The predicate of the fetch request.
- iOS 3.0+
- macOS 10.4+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Data
The predicate instance constrains the selection of objects the
NSFetch instance is to fetch.
If the predicate is empty—for example, if it is an
AND predicate whose array of elements contains no predicates—the request has its predicate set to
nil. For more about predicates, see Predicate Programming Guide.