# init(to:by:mode:timing:isAdditive:) Creates a action to animate towards a final value. The starting value is determined by adding the inverse of `by` to the specified final value. ``` init(to: Value, by: Value, mode: FromToByAction.TransformMode = .default, timing: AnimationTimingFunction = .linear, isAdditive: Bool = false) ``` ## Parameters `to` Value set at the end of the animation. `by` Value used to determine the starting value, relative to the end value. `mode` Determines what space the transforms are relative to. `timing` Controls the progress of the animation. `isAdditive` Specifies whether you can additively blend the output from the action’s animation. ## Discussion `to - by` → `to` --- 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)