# CAMediaTimingFunction A function that defines the pacing of an animation as a timing curve. ``` class CAMediaTimingFunction ``` ## Overview `CAMediaTimingFunction` represents one segment of a function that defines the pacing of an animation as a timing curve. The function maps an input time normalized to the range `[0,1]` to an output time also in the range `[0,1]`. You can create a media timing function by supplying your own cubic Bézier curve control points using the [`init(controlPoints:_:_:_:)`](/documentation/QuartzCore/CAMediaTimingFunction/init(controlPoints:_:_:_:)) method or by using one of the predefined timing functions. ## Topics ### Creating Timing Functions [`init(name:)`](/documentation/QuartzCore/CAMediaTimingFunction/init(name:)) Creates and returns a new instance of `CAMediaTimingFunction` configured with the predefined timing function specified by `name`. [`functionWithControlPoints::::`](/documentation/QuartzCore/CAMediaTimingFunction/functionWithControlPoints::::) Creates and returns a new instance of `CAMediaTimingFunction` timing function modeled as a cubic Bézier curve using the specified control points. [`init(controlPoints:_:_:_:)`](/documentation/QuartzCore/CAMediaTimingFunction/init(controlPoints:_:_:_:)) Returns an initialized timing function modeled as a cubic Bézier curve using the specified control points. ### Accessing the Control Points [`getControlPoint(at:values:)`](/documentation/QuartzCore/CAMediaTimingFunction/getControlPoint(at:values:)) Returns the control point for the specified index. ### Constants [Predefined Timing Functions](/documentation/QuartzCore/predefined-timing-functions) Constants that specify system-provided timing functions, used by [`init(name:)`](/documentation/QuartzCore/CAMediaTimingFunction/init(name:)). --- 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)