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# modifyFontViaPanel(_:)

Modifies a font trait using input from the Font panel.

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

## Parameters

`sender`

The control that sent the message.

## Discussion

By default, the action message is <doc://com.apple.documentation/documentation/ObjectiveC/NSObject-swift.class/changeFont:>. This action method causes the receiver to send its action message up the responder chain.

When a responder replies by providing a font to convert in a [`convert(_:)`](/documentation/AppKit/NSFontManager/convert(_:)) message, the receiver converts the font by sending a [`convert(_:)`](/documentation/AppKit/NSFontPanel/convert(_:)) message to the Font panel. The panel in turn may send [`convert(_:toFamily:)`](/documentation/AppKit/NSFontManager/convert(_:toFamily:)), [`convert(_:toHaveTrait:)`](/documentation/AppKit/NSFontManager/convert(_:toHaveTrait:)), and other specific conversion methods to make its change.

---

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