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# changeFont:

Informs responders of a font change.

```
- (void) changeFont:(id) sender;
```

## Parameters

`sender`

The object that sent the message.

## Discussion

Generally this change is because the user changed the font either in the selection of a rich text field or in a whole plain text field. Any object that contains a font the user can change must respond to the [`changeFont:`](/documentation/ObjectiveC/NSObject-swift.class/changeFont:) message by sending a <doc://com.apple.documentation/documentation/AppKit/NSFontManager/convert(_:)> message back to `sender` (an NSFontManager object) for each font in the selection. For more information, see Responding to Font Changes.

Be aware that <doc://com.apple.documentation/documentation/AppKit/NSFontManager/selectedFont> at this point may return unpredictable results. The font in this property may not be the last font selected, or there may be multiple fonts selected at the time [`changeFont:`](/documentation/ObjectiveC/NSObject-swift.class/changeFont:) is called. The use of <doc://com.apple.documentation/documentation/AppKit/NSFontManager/selectedFont> from within [`changeFont:`](/documentation/ObjectiveC/NSObject-swift.class/changeFont:) is strongly discouraged.

## See Also

  <doc://com.apple.documentation/documentation/AppKit/NSFontManager/convert(_:toFamily:)>

  <doc://com.apple.documentation/documentation/AppKit/NSFontManager/addFontTrait(_:)>

  <doc://com.apple.documentation/documentation/AppKit/NSFontManager/convert(_:toSize:)>

  <doc://com.apple.documentation/documentation/AppKit/NSFontManager/convert(_:toHaveTrait:)>

  <doc://com.apple.documentation/documentation/AppKit/NSFontManager/modifyFont(_:)>

  <doc://com.apple.documentation/documentation/AppKit/NSFontManager/convert(_:toNotHaveTrait:)>

  <doc://com.apple.documentation/documentation/AppKit/NSFontManager/modifyFontViaPanel(_:)>

  <doc://com.apple.documentation/documentation/AppKit/NSFontManager/convertWeight(_:of:)>

  <doc://com.apple.documentation/documentation/AppKit/NSFontManager/convert(_:toFace:)>

  <doc://com.apple.documentation/documentation/AppKit/NSFontManager/removeFontTrait(_:)>


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