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# deselectAll(_:)

Deselects all selected rows or columns if empty selection is allowed; otherwise does nothing.

```
func deselectAll(_ sender: Any?)
```

## Parameters

`sender`

Typically the object that sent the message.

## Discussion

Posts [`selectionDidChangeNotification`](/documentation/AppKit/NSTableView/selectionDidChangeNotification) to the default notification center if the selection does in fact change.

As a target-action method, [`deselectAll(_:)`](/documentation/AppKit/NSTableView/deselectAll(_:)) checks with the delegate before changing the selection, using [`selectionShouldChange(in:)`](/documentation/AppKit/NSTableViewDelegate/selectionShouldChange(in:)).

## See Also

[`-  selectionShouldChangeInTableView:`](/documentation/AppKit/NSTableViewDelegate/selectionShouldChange(in:))

Asks the delegate if the user is allowed to change the selection.

[`-  selectColumn:byExtendingSelection:`](/documentation/AppKit/NSTableView/selectColumn:byExtendingSelection:)

Selects the column at the specified index, optionally extending any existing selection.

[`allowsEmptySelection`](/documentation/AppKit/NSTableView/allowsEmptySelection)

A Boolean value indicating whether the table view allows the user to select zero columns or rows.


---

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