---
title: selectionIsChangingNotification
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nscombobox/selectionischangingnotification
---

# selectionIsChangingNotification

Posted whenever the pop-up list selection of the NSComboBox is changing.

## Declaration

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

## Discussion

Discussion The notification object is the NSComboBox whose selection is changing. This notification does not contain a userInfo dictionary. To observe this notification using Swift concurrency, use NSComboBox.SelectionIsChangingMessage.

## See Also

### Notifications

- [selectionDidChangeNotification](appkit/nscombobox/selectiondidchangenotification.md)
- [willDismissNotification](appkit/nscombobox/willdismissnotification.md)
- [willPopUpNotification](appkit/nscombobox/willpopupnotification.md)