# animate(value:time:context:) Calculates the value of the animation at the specified time. ``` nonisolated func animate(value: V, time: TimeInterval, context: inout AnimationContext) -> V? where V : VectorArithmetic ``` ## Parameters `value` The vector to animate towards. `time` The elapsed time since the start of the animation. `context` An instance of [`AnimationContext`](/documentation/SwiftUI/AnimationContext) that provides access to state and the animation environment. ## Return Value The current value of the animation, or `nil` if the animation has finished. ## Discussion Implement this method to calculate and return the value of the animation at a given point in time. If the animation has finished, return `nil` as the value. This signals to the system that it can remove the animation. If your custom animation needs to maintain state between calls to the `animate(value:time:context:)` method, store the state data in `context`. This makes the data available to the method next time the system calls it. To learn more about managing state data in a custom animation, see [`AnimationContext`](/documentation/SwiftUI/AnimationContext). --- 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)