Returns a Boolean value that indicates whether a given value is in a dictionary.
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
The dictionary to examine.
The value for which to find matches in
the. The value equal callback provided when the dictionary was created is used to compare. If the equal callback was
NULL, pointer equality (in C, ==) is used. If
value, or any other value in the dictionary, is not understood by the equal callback, the behavior is undefined.
value is in the dictionary, otherwise