---
title: "animate(alongsideTransition:completion:)"
framework: uikit
role: symbol
role_heading: Instance Method
path: "uikit/uiviewcontrollertransitioncoordinator/animate(alongsidetransition:completion:)"
---

# animate(alongsideTransition:completion:)

Runs the specified animations at the same time as the view controller transition animations.

## Declaration

```swift
func animate(alongsideTransition animation: ((any UIViewControllerTransitionCoordinatorContext) -> Void)?, completion: ((any UIViewControllerTransitionCoordinatorContext) -> Void)? = nil) -> Bool
```

## Parameters

- `animation`: A block containing the animations you want to perform. These animations run in the same context as the transition animations and therefore have the same default attributes. You may specify nil for this parameter. The block has no return value and takes the following parameter: The animation you specify must take place in a view descended from the container view.
- `completion`: The block of code to execute after the transition finishes. You may specify nil for this parameter. The block has no return value and takes the following parameter:

## Return Value

Return Value true if the animations were successfully queued to run or false if they were not.

## Discussion

Discussion Use this method to perform animations that aren’t handled by the animator objects themselves. All of the animations you specify must occur inside the animation context’s container view (or one of its descendants). Use the containerView property of the context object to get the container view. To perform animations in a view that doesn’t descend from the container view, use the animateAlongsideTransition(in:animation:completion:) method instead. The animations in the animation parameter are normally performed concurrently with the view controller transition animations. That behavior applies when the animator object’s animateTransition(using:) method is implemented using UIView-based animations. If the animator object uses Core Animation to animate the layer contents directly, your animations are run shortly after the animateTransition: method returns. This method returns false when the block in the animation parameter can’t be queued to run. The completion block can still run even when this method returns false.

## See Also

### Responding to view controller transition progress

- [animateAlongsideTransition(in:animation:completion:)](uikit/uiviewcontrollertransitioncoordinator/animatealongsidetransition(in:animation:completion:).md)
- [notifyWhenInteractionChanges(_:)](uikit/uiviewcontrollertransitioncoordinator/notifywheninteractionchanges(_:).md)
- [notifyWhenInteractionEnds(_:)](uikit/uiviewcontrollertransitioncoordinator/notifywheninteractionends(_:).md)