# flush() Flushes any extant implicit transaction. ``` class func flush() ``` ## Discussion Delays the commit until any nested explicit transactions have completed. Flush is typically called automatically at the end of the current runloop, regardless of the runloop mode. If your application does not have a runloop, you must call this method explicitly. However, you should attempt to avoid calling `flush` explicitly. By allowing `flush` to execute during the runloop your application will achieve better performance, atomic screen updates will be preserved, and transactions and animations that work from transaction to transaction will continue to function. --- 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)