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# allowsColumnSelection

A Boolean value indicating whether the table view allows the user to select columns by clicking their headers.

```
var allowsColumnSelection: Bool { get set }
```

## Discussion

The default is <doc://com.apple.documentation/documentation/Swift/false>, which prevents the user from selecting columns (if you create the table view in Interface Builder, the default value is <doc://com.apple.documentation/documentation/Swift/true>). You can select columns programmatically regardless of this setting.

## See Also

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

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


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