Returns the user info dictionary for a given CFError.
- iOS 2.0+
- macOS 10.5+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
The error to examine. If this is not a valid CFError, the behavior is undefined.
A dictionary containing the same keys and values as in the userInfo dictionary
err was created with. Returns an empty dictionary if
NULL was supplied to the create function. Ownership follows the The Create Rule.