# addCompletion(_:) Adds the specified completion block to the animator. ``` optional func addCompletion(_ completion: @escaping (UIViewAnimatingPosition) -> Void) ``` ## Parameters `completion` A block to execute when the animations finish. This block has no return value and takes the following parameter: - finalPosition: The position where the animations stopped. Use this value to specify whether the animations stopped at their starting point, their end point, or their current position. ## Discussion Use this method to add the completion blocks to your custom animator object. Completion blocks should execute after the animations finish successfully. If the [`stopAnimation(_:)`](/documentation/UIKit/UIViewAnimating/stopAnimation(_:)) method is called, do not execute any completion blocks if the `withoutFinishing` parameter for that method contains the value . If the parameter is and the client subsequent calls the [`finishAnimation(at:)`](/documentation/UIKit/UIViewAnimating/finishAnimation(at:)) method, execute the completion blocks in your implementation of that method. Your implementation must be able to handle multiple calls to this method. --- 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)