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# collectionView(_:didUpdateFocusIn:with:)

Tells the delegate that a focus update occurred.

```
optional func collectionView(_ collectionView: UICollectionView, didUpdateFocusIn context: UICollectionViewFocusUpdateContext, with coordinator: UIFocusAnimationCoordinator)
```

## Parameters

`collectionView`

The collection view object notifying you of the focus change.

`context`

The context object containing metadata associated with the focus change. This object contains the index path of the previously focused item and the currently focused item.

`coordinator`

The animation coordinator to use when creating any additional animations.

## Discussion

The collection view calls this method when a focus-related change occurs. You can use this method to update your app’s state information or to animate changes to your app’s visual appearance.

If you subclass [`UICollectionView`](/documentation/UIKit/UICollectionView), you can also implement the same behavior by overriding the [`didUpdateFocus(in:with:)`](/documentation/UIKit/UIFocusEnvironment/didUpdateFocus(in:with:)) method, which is defined by the [`UIFocusEnvironment`](/documentation/UIKit/UIFocusEnvironment) protocol and adopted by all views.

## See Also

[`-  didUpdateFocusInContext:withAnimationCoordinator:`](/documentation/UIKit/UIFocusEnvironment/didUpdateFocus(in:with:))

Called immediately after the system updates the focus to a new view.


---

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