# Keyframes A type that defines changes to a value over time. ``` protocol Keyframes ``` ## Topics ### Creating a keyframe [`var body: Self.Body`](/documentation/SwiftUI/Keyframes/body-swift.property) The composition of content that comprise the keyframes. [`associatedtype Body : Keyframes`](/documentation/SwiftUI/Keyframes/Body-swift.associatedtype) The type of keyframes representing the body of this type. [`associatedtype Value = Self.Body.Value`](/documentation/SwiftUI/Keyframes/Value) The type of value animated by this keyframes type ## Relationships ### Conforming Types [`KeyframeTrack`](/documentation/SwiftUI/KeyframeTrack) --- 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)