# setAnimationDidStop(_:) Sets the message to send to the animation delegate when animation stops. ``` class func setAnimationDidStop(_ selector: Selector?) ``` ## Parameters `selector` The message sent to the animation delegate after animations end. The default value is `NULL`. The selector should be of the form: `- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context`. Your method must take the following arguments: - `animationID` An containing an optional application-supplied identifier. This is the identifier that is passed to the [`beginAnimations(_:context:)`](/documentation/UIKit/UIView/beginAnimations(_:context:)) method. This argument can be `nil` . - `finished` An object containing a Boolean value. The value is if the animation ran to completion before it stopped or if it did not. - `context` An optional application-supplied context. This is the context data passed to the [`beginAnimations(_:context:)`](/documentation/UIKit/UIView/beginAnimations(_:context:)) method. This argument can be `nil` . ## Discussion If you specify an animation delegate for a begin/commit set of animations, you use this method to specify the selector to call after the animations end. This method does nothing if called from outside of an animation block. It must be called between calls to the [`beginAnimations(_:context:)`](/documentation/UIKit/UIView/beginAnimations(_:context:)) and [`commitAnimations()`](/documentation/UIKit/UIView/commitAnimations()) methods. This selector is set to `NULL` by default. > Note: > Your stop selector is still called even if animations are disabled. Use of this method is discouraged in iOS 4.0 and later. If you are using the block-based animation methods, you can include your delegate’s end code directly inside your block. --- 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)