# update(deltaTime:) Performs any custom periodic actions defined by the component subclass. ``` func update(deltaTime seconds: TimeInterval) ``` ## Parameters `seconds` The time step to use for any time-dependent actions performed by this method (typically, the elapsed time since the previous call to this method). ## Discussion Override this method to implement per-frame logic specific to your component class. GameplayKit calls this method when you call the [`update(deltaTime:)`](/documentation/GameplayKit/GKEntity/update(deltaTime:)) method of the entity owning a component, or when you call the [`update(deltaTime:)`](/documentation/GameplayKit/GKComponentSystem/update(deltaTime:)) method of a [`GKComponentSystem`](/documentation/GameplayKit/GKComponentSystem) object that manages all components of a specific [`GKComponent`](/documentation/GameplayKit/GKComponent) subclass. Typically, you call one of those methods in response to a per-frame game loop method such as (SpriteKit) or (SceneKit). For more information, see [GameplayKit Programming Guide](https://developer.apple.com/library/archive/documentation/General/Conceptual/GameplayKit_Guide/index.html#//apple_ref/doc/uid/TP40015172). --- 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)