# SKSceneDelegate Methods that, when implemented, allow any class to participate in the SpriteKit render loop callbacks. ``` protocol SKSceneDelegate : NSObjectProtocol ``` ## Overview The [`SKSceneDelegate`](/documentation/SpriteKit/SKSceneDelegate) protocol is used to implement a delegate to be called whenever the scene is being animated. Typically, you supply a delegate when you want to use a scene without requiring the scene to be subclassed. The methods in this protocol all correspond to methods implemented by the [`SKScene`](/documentation/SpriteKit/SKScene) class. If the delegate implements a particular method, that method is called instead of the corresponding method on the scene object. When processing a scene, SpriteKit runs a loop that processes and renders the scene. The [`SKSceneDelegate`](/documentation/SpriteKit/SKSceneDelegate) methods allows you to add logic at any step of the loop.  > Important: > If your view has a ``doc://com.apple.spritekit/documentation/SpriteKit/SKViewDelegate`` and its ``doc://com.apple.spritekit/documentation/SpriteKit/SKViewDelegate/view(_:shouldRenderAtTime:)`` method returns , the update is skipped and none of the scene delegate methods are called. ## Topics ### Handling Animation Events [Use SpriteKit Objects within Scene Delegate Callbacks](/documentation/SpriteKit/use-spritekit-objects-within-scene-delegate-callbacks) Follow threading guidelines to keep your SpriteKit app thread safe. [`update(_:for:)`](/documentation/SpriteKit/SKSceneDelegate/update(_:for:)) Tells you to perform any app specific logic to update your scene. [`didEvaluateActions(for:)`](/documentation/SpriteKit/SKSceneDelegate/didEvaluateActions(for:)) Tells you to peform any necessary logic after scene actions are evaluated. [`didSimulatePhysics(for:)`](/documentation/SpriteKit/SKSceneDelegate/didSimulatePhysics(for:)) Tells you to peform any necessary logic after physics simulations are performed. [`didApplyConstraints(for:)`](/documentation/SpriteKit/SKSceneDelegate/didApplyConstraints(for:)) Tells you to peform any necessary logic after constraints are applied. [`didFinishUpdate(for:)`](/documentation/SpriteKit/SKSceneDelegate/didFinishUpdate(for:)) Tells you to peform any necessary logic after the scene has finished all of the steps required to process animations. --- 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)