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# UICollectionView.LayoutInteractiveTransitionCompletion

The completion block called at the end of an interactive transition for a collection view.

```
typealias LayoutInteractiveTransitionCompletion = (Bool, Bool) -> Void
```

## Discussion

This completion block takes the following parameters:

- completed: A Boolean indicating whether the animations ran to completion.
- finish: A Boolean indicating whether the transition finished or was canceled. This parameter is <doc://com.apple.documentation/documentation/Swift/true> if the transition ran to completion and the new layout is installed. It is <doc://com.apple.documentation/documentation/Swift/false> if the user canceled the transition and the old layout is installed.

---

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