---
title: "comboBoxSelectionIsChanging(_:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nscomboboxdelegate/comboboxselectionischanging(_:)"
---

# comboBoxSelectionIsChanging(_:)

Informs the delegate that the pop-up list selection is changing.

## Declaration

```swift
@MainActor optional func comboBoxSelectionIsChanging(_ notification: Notification)
```

## Parameters

- `notification`: A notification named doc://com.apple.appkit/documentation/AppKit/NSComboBox/selectionIsChangingNotification.

## See Also

### Manipulating the selection

- [comboBoxSelectionDidChange(_:)](appkit/nscomboboxdelegate/comboboxselectiondidchange(_:).md)
- [comboBoxWillDismiss(_:)](appkit/nscomboboxdelegate/comboboxwilldismiss(_:).md)
- [comboBoxWillPopUp(_:)](appkit/nscomboboxdelegate/comboboxwillpopup(_:).md)