---
title: "notifyWhenInteractionEnds(_:)"
framework: uikit
role: symbol
role_heading: Instance Method
path: "uikit/uiviewcontrollertransitioncoordinator/notifywheninteractionends(_:)"
---

# notifyWhenInteractionEnds(_:)

Registers a block to be executed when a transition changes from interactive to non-interactive.

## Declaration

```swift
func notifyWhenInteractionEnds(_ handler: @escaping (any UIViewControllerTransitionCoordinatorContext) -> Void)
```

## Parameters

- `handler`: The block to execute when the transition changes from interactive to noninteractive. The block has no return value and takes the following parameter:

## Discussion

Discussion Your block is executed both when the transition completes normally and when the user cancels the transition. In the case where the user cancels the transition, UIKit executes your context block, calls the viewWillDisappear(_:) method on the presented view controller, and finally calls the viewWillAppear(_:) method on the original view controller to signal that it’s once again visible. Inside your block, you can get the value of the isCancelled method of the transition coordinator context and use that value to determine the appropriate course of action. For example, if the transition was canceled, you might use this block to remove any extra views that were added to the view hierarchy by a previous call to animate(alongsideTransition:completion:) or animateAlongsideTransition(in:animation:completion:). You can call this method multiple times to register multiple blocks. All of the registered blocks are executed when the transition state changes.

## See Also

### Responding to view controller transition progress

- [animate(alongsideTransition:completion:)](uikit/uiviewcontrollertransitioncoordinator/animate(alongsidetransition:completion:).md)
- [animateAlongsideTransition(in:animation:completion:)](uikit/uiviewcontrollertransitioncoordinator/animatealongsidetransition(in:animation:completion:).md)
- [notifyWhenInteractionChanges(_:)](uikit/uiviewcontrollertransitioncoordinator/notifywheninteractionchanges(_:).md)