---
title: didBecomeHiddenNotification
framework: uikit
role: symbol
role_heading: Type Property
path: uikit/uiwindow/didbecomehiddennotification
---

# didBecomeHiddenNotification

A notification that posts when a window becomes hidden.

## Declaration

```swift
nonisolated class let didBecomeHiddenNotification: NSNotification.Name
```

## Discussion

Discussion The notification object is the hidden window. This notification doesn’t contain a userInfo dictionary. Switching between apps doesn’t generate visibility-related notifications for windows. Window visibility changes reflect changes to the window’s isHidden property and reflect only the window’s visibility within the app. The system posts this notification on the main actor.

## See Also

### Responding to window-related notifications

- [didBecomeVisibleNotification](uikit/uiwindow/didbecomevisiblenotification.md)
- [didBecomeKeyNotification](uikit/uiwindow/didbecomekeynotification.md)
- [didResignKeyNotification](uikit/uiwindow/didresignkeynotification.md)