---
title: didChangeBackingPropertiesNotification
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nswindow/didchangebackingpropertiesnotification
---

# didChangeBackingPropertiesNotification

A notification that the window object backing properties changed.

## Declaration

```swift
class let didChangeBackingPropertiesNotification: NSNotification.Name
```

## Discussion

Discussion The notification object is the NSWindow object whose backing properties changed. This notification contains a userInfo dictionary that has backing scale and color space information. See NSWindowDidChangeBackingPropertiesNotification User Info Properties for the userInfo dictionary keys and values. To observe this notification using Swift concurrency, use NSWindow.DidChangeBackingPropertiesMessage.

## See Also

### Notifications

- [didBecomeKeyNotification](appkit/nswindow/didbecomekeynotification.md)
- [didBecomeMainNotification](appkit/nswindow/didbecomemainnotification.md)
- [didChangeScreenNotification](appkit/nswindow/didchangescreennotification.md)
- [didChangeScreenProfileNotification](appkit/nswindow/didchangescreenprofilenotification.md)
- [didDeminiaturizeNotification](appkit/nswindow/diddeminiaturizenotification.md)
- [didEndSheetNotification](appkit/nswindow/didendsheetnotification.md)
- [didEndLiveResizeNotification](appkit/nswindow/didendliveresizenotification.md)
- [didExposeNotification](appkit/nswindow/didexposenotification.md)
- [didMiniaturizeNotification](appkit/nswindow/didminiaturizenotification.md)
- [didMoveNotification](appkit/nswindow/didmovenotification.md)
- [didResignKeyNotification](appkit/nswindow/didresignkeynotification.md)
- [didResignMainNotification](appkit/nswindow/didresignmainnotification.md)
- [didResizeNotification](appkit/nswindow/didresizenotification.md)
- [didUpdateNotification](appkit/nswindow/didupdatenotification.md)
- [willBeginSheetNotification](appkit/nswindow/willbeginsheetnotification.md)