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# columnDidResizeNotification

Posted whenever a column is resized in an `NSTableView` object.

```
class let columnDidResizeNotification: NSNotification.Name
```

## Discussion

The notification object is the table view in which a column was resized. The `userInfo` dictionary contains the following information:

|Key               |Value                                                                   |
|------------------|------------------------------------------------------------------------|
|`@"NSTableColumn"`|The column that was resized.                                            |
|`@"NSOldWidth"`   |An NSNumber containing the integer value of the column’s original width.|

To observe this notification using Swift concurrency, use [`NSTableView.ColumnDidResizeMessage`](/documentation/AppKit/NSTableView/ColumnDidResizeMessage).

---

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