Returns the number of times a key occurs in a dictionary.
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
The dictionary to examine.
The key for which to find matches in
the. The key hash and equal callbacks provided when the dictionary was created are used to compare. If the hash callback was
NULL, the key is treated as a pointer and converted to an integer. If the equal callback was
NULL, pointer equality (in C, ==) is used. If
key, or any of the keys in the dictionary, is not understood by the equal callback, the behavior is undefined.
1 if a matching key is used by the dictionary, otherwise