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# performZoom(_:)

This action method simulates the user clicking the zoom box by momentarily highlighting the button and then zooming the window.

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

## Parameters

`sender`

The object sending the message.

## Discussion

If the window doesn’t have a zoom box or can’t be zoomed for some reason, the computer beeps.

## See Also

[`styleMask`](/documentation/AppKit/NSWindow/styleMask-swift.property)

Flags that describe the window’s current style, such as if it’s resizable or in full-screen mode.


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