# paced Linear keyframe values are interpolated to produce an even pace throughout the animation. ``` static let paced: CAAnimationCalculationMode ``` ## Discussion `kCAAnimationPaced` gives a linearly interpolated animation, but [`keyTimes`](/documentation/QuartzCore/CAKeyframeAnimation/keyTimes) and [`timingFunction`](/documentation/QuartzCore/CAAnimation/timingFunction) are ignored and keyframe times are automatically generated to give the animation a constant velocity. The following code shows how to create a keyframe animation object using paced interpolation. Listing 1. Creating paced key values ```objc let keyframeAnimation = CAKeyframeAnimation(keyPath: "position.y") keyframeAnimation.calculationMode = kCAAnimationPaced keyframeAnimation.values = [310, 60, 120, 60, 310] ``` A layer animated with the keyframe 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)