# default The system default timing function. Use this function to ensure that the timing of your animations matches that of most system animations. ``` static let `default`: CAMediaTimingFunctionName ``` ## Discussion This is a Bézier timing function with the control points (0.25,0.1) and (0.25,1.0). The following code shows how to create a basic animation object using default interpolation: ```swift let verticalAnimation = CABasicAnimation(keyPath: "position.y") verticalAnimation.fromValue = 310 verticalAnimation.toValue = 10 verticalAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionDefault) ``` A layer animated with the animation created by the code above and with linearly interpolated horizontal movement would describe a path similar to the following figure.  --- 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)