# init(revolutions:localAxis:timingFunction:isAdditive:) Creates a new spin action. ``` init(revolutions: Float, localAxis: SIMD3 = [0, 1, 0], timingFunction: AnimationTimingFunction = .default, isAdditive: Bool = false) ``` ## Parameters `revolutions` The number of rotations to complete before stopping. `localAxis` A vector that describes the axis of rotation (in local space). `timingFunction` A timing function that controls the progress of the animation. `isAdditive` A Boolean value that indicates whether the animation system additively blends the action’s output with the base 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)