The user info dictionary.
- iOS 2.0+
- macOS 10.2+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
If the user info dictionary has not been set, this property is
On macOS 10.8 or later, if the user info dictionary has not been set, this property returns an empty dictionary.
Getting Error Properties
A string containing the error domain.
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