# userInfo The user information dictionary associated with the notification. ``` var userInfo: [AnyHashable : Any]? { get } ``` ## Discussion In Objective-C, this may be `nil`. The user information dictionary stores any additional objects that objects receiving the notification might use. For example, in AppKit, objects post the whenever the field editor (an object) changes text inside the `NSControl`. This notification provides the `NSControl` object as the notification’s associated object. In order to provide access to the field editor, the `NSControl` object posting the notification adds the field editor to the notification’s user information dictionary. Objects receiving the notification can access the field editor and the `NSControl` object posting the notification as follows: ```swift func controlTextDidChange(_ notification: Notification) { if let fieldEditor = notification.userInfo?["NSFieldEditor"] as? NSText, let postingObject = notification.object as? NSControl { // work with the field editor and posting object } } ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)