Flushes any extant implicit transaction.
- iOS 2.0+
- macOS 10.5+
- tvOS 9.0+
- Core Animation
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.