# beginFrame(atTime:timeStamp:) Begin rendering a frame at the specified time. ``` func beginFrame(atTime t: CFTimeInterval, timeStamp ts: UnsafeMutablePointer?) ``` ## Parameters `t` The layer time. `ts` The display timestamp associated with timeInterval. Can be null. ## Discussion --- 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)