# Subclassing Scenes Versus Assigning a Delegate Use a scene delegate to share app logic across various scenes. ## Discussion Often, your app subclasses [`SKScene`](/documentation/SpriteKit/SKScene) to deliver gameplay. Your subclass usually: - Lays out initial scene content - Defines app logic that runs every frame - Implements responder methods to handle keyboard, mouse, or touch events An alternative pattern is to assign a [`delegate`](/documentation/SpriteKit/SKView/delegate) that handles [`SKScene`](/documentation/SpriteKit/SKScene) instead. For example, if you make the view controller the delegate for your scene, it can use multiple scenes that share the same [`SKSceneDelegate`](/documentation/SpriteKit/SKSceneDelegate) implementations. The view controller participates in event handling and so it can respond to user input also. > Important: > On macOS, you need to set the window’s to your app’s view controller because by default, the view is the first responder to user input events. --- 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)