# scaleX(by:y:duration:) Creates an action that adds relative values to the x and y scale values of a node. ``` class func scaleX(by xScale: CGFloat, y yScale: CGFloat, duration: TimeInterval) -> SKAction ``` ## Parameters `xScale` The amount to add to the node’s x scale value. `yScale` The amount to add to the node’s y scale value. `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:** ```swift let action = SKAction.scaleX(by: -scaleX, y: -scaleY, duration: sec) ``` **Obj-C:** ```objc [SKAction scaleXBy: -xScale y: -yScale 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)