# update(value:velocity:target:deltaTime:) Updates the current value and velocity of a spring. ``` func update(value: inout V, velocity: inout V, target: V, deltaTime: TimeInterval) where V : VectorArithmetic ``` ## Parameters `value` The current value of the spring. `velocity` The current velocity of the spring. `target` The target that `value` is moving towards. `deltaTime` The amount of time that has passed since the spring was at the position specified by `value`. --- 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)