# UITimingCurveProvider An interface for providing the timing information needed to perform animations. ``` @MainActor protocol UITimingCurveProvider : NSCoding, NSCopying ``` ## Overview An object that adopts the [`UITimingCurveProvider`](/documentation/UIKit/UITimingCurveProvider) protocol provides the timing information needed to perform animations with a [`UIViewPropertyAnimator`](/documentation/UIKit/UIViewPropertyAnimator) object. A timing curve defines the velocity at which animated properties change to their new values over the duration of the animation. A custom timing curve provider can specify timing using the built-in UIKit curves, a cubic Bézier curve, a spring-based timing function, or a combination of timing information. When implementing this protocol in a custom object, you must provide implementations for all of the properties. Use the [`timingCurveType`](/documentation/UIKit/UITimingCurveProvider/timingCurveType) property to specify which timing information your object provides. Configure the other properties with the actual timing curve values. ## Topics ### Getting the timing information [`timingCurveType`](/documentation/UIKit/UITimingCurveProvider/timingCurveType) The type of timing information to use. [`cubicTimingParameters`](/documentation/UIKit/UITimingCurveProvider/cubicTimingParameters) The cubic timing parameters to use. [`springTimingParameters`](/documentation/UIKit/UITimingCurveProvider/springTimingParameters) The spring-based timing parameters to use. ### Constants [`UITimingCurveType`](/documentation/UIKit/UITimingCurveType) Constants indicating the type of timing information to use. ## Relationships ### Inherits From [`NSCoding`](/documentation/Foundation/NSCoding) [`NSCopying`](/documentation/Foundation/NSCopying) ### Conforming Types [`UICubicTimingParameters`](/documentation/UIKit/UICubicTimingParameters) [`UISpringTimingParameters`](/documentation/UIKit/UISpringTimingParameters) --- 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)