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# convert(_:to:)

Converts a size from the view’s coordinate system to that of another view.

```
func convert(_ size: NSSize, to view: NSView?) -> NSSize
```

## Parameters

`size`

The size (width and height) in the view’s coordinate system.

`view`

The view that’s the target of the conversion operation. Both `view` and the view must belong to the same [`NSWindow`](/documentation/AppKit/NSWindow) object, and that window must not be `nil`. If `view` is `nil`, this method converts to window coordinates instead.

## Return Value

The converted size, as an <doc://com.apple.documentation/documentation/Foundation/NSSize> structure.

## Discussion

The returned `NSSize` values are always forced to have positive a width and height.

## See Also

[`contentView`](/documentation/AppKit/NSWindow/contentView)

The window’s content view, the highest accessible view object in the window’s view hierarchy.

[`-  ancestorSharedWithView:`](/documentation/AppKit/NSView/ancestorShared(with:))

Returns the closest ancestor shared by the view and another specified view.


---

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