# scale(by:duration:) Creates an action that changes the x and y scale values of a node by a relative value. ``` class func scale(by scale: CGFloat, duration: TimeInterval) -> SKAction ``` ## Parameters `scale` The amount to add to the node’s x and y scale values. `duration` The duration of the animation. ## Return Value A new action object. ## Discussion When the action executes, the node’s [`xScale`](/documentation/SpriteKit/SKNode/xScale) and [`yScale`](/documentation/SpriteKit/SKNode/yScale) properties are animated to the new value. This action is reversible; the reverse is created as if the following code is executed: ```swift let action = SKAction.scale(by: -scale, duration: sec) ``` --- 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)