# animateAlongsideTransition(in:animation:completion:) Runs the specified animations in a view that’s outside of the designated container view. ``` func animateAlongsideTransition(in view: UIView?, animation: ((any UIViewControllerTransitionCoordinatorContext) -> Void)?, completion: ((any UIViewControllerTransitionCoordinatorContext) -> Void)? = nil) -> Bool ``` ## Parameters `view` The view (or one of its ancestors) in which the specified animations take place. This parameter must not be `nil`. `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: - context: The contextual information for performing the animations. Use this object to get the animation-related information. For more information, see [`UIViewControllerTransitionCoordinatorContext`](/documentation/UIKit/UIViewControllerTransitionCoordinatorContext). `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: - context: The contextual information for performing the animations. Use this object to get the animation-related information. For more information, see [`UIViewControllerTransitionCoordinatorContext`](/documentation/UIKit/UIViewControllerTransitionCoordinatorContext). ## Return Value if the specified animation is successfully queued to run; otherwise . ## Discussion Use this method to perform animations that aren’t handled by the animator objects themselves. The animations you specify in the `animation` parameter must all take place in a view descended from the view you specify in the `view` parameter. 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:)`](/documentation/UIKit/UIViewControllerAnimatedTransitioning/animateTransition(using:)) method is implemented using [`UIView`](/documentation/UIKit/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 when the block in the `animation` parameter can’t be queued to run. The completion block can still run even when this method returns . --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)