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# Notification dictionary keys

Handle notifications with keys in the user info dictionary.

## Topics

### Notification keys

[`announcementStringValueUserInfoKey`](/documentation/UIKit/UIAccessibility/announcementStringValueUserInfoKey)

The text of the announcement.

[`announcementWasSuccessfulUserInfoKey`](/documentation/UIKit/UIAccessibility/announcementWasSuccessfulUserInfoKey)

A Boolean value that indicates whether the announcement is successful.

[`focusedElementUserInfoKey`](/documentation/UIKit/UIAccessibility/focusedElementUserInfoKey)

The element currently in focus by the assistive app.

[`unfocusedElementUserInfoKey`](/documentation/UIKit/UIAccessibility/unfocusedElementUserInfoKey)

The element previously in focus by the assistive app.

[`assistiveTechnologyUserInfoKey`](/documentation/UIKit/UIAccessibility/assistiveTechnologyUserInfoKey)

The identifier of the assistive app.

[`UIAccessibility.AssistiveTechnologyIdentifier`](/documentation/UIKit/UIAccessibility/AssistiveTechnologyIdentifier)

Identifiers for assistive apps.


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