# makeTimerSource(flags:queue:) Creates a new dispatch source object for monitoring timer events. ``` class func makeTimerSource(flags: DispatchSource.TimerFlags = [], queue: DispatchQueue? = nil) -> any DispatchSourceTimer ``` ## Parameters `flags` Additional flags indicating the behavior of the timer. For a list of possible values, see [`DispatchSource.TimerFlags`](/documentation/Dispatch/DispatchSource/TimerFlags). `queue` The dispatch queue to which to execute the installed handlers. ## Return Value A dispatch source object that conforms to the [`DispatchSourceTimer`](/documentation/Dispatch/DispatchSourceTimer) protocol. ## Discussion After creating the dispatch source, use the methods of the [`DispatchSourceProtocol`](/documentation/Dispatch/DispatchSourceProtocol) protocol to install the event handlers you need. The returned dispatch source is in the inactive state initially. When you are ready to begin processing events, call its [`activate()`](/documentation/Dispatch/DispatchObject/activate()) method. To schedule timers, use the methods of the [`DispatchSourceTimer`](/documentation/Dispatch/DispatchSourceTimer) protocol. You may schedule timers that fire once or fire multiple times. Each time the timer fires, the dispatch source calls your installed event handler. --- 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)