# scheduledTimer(timeInterval:invocation:repeats:) Creates a new timer and schedules it on the current run loop in the default mode. ``` class func scheduledTimer(timeInterval ti: TimeInterval, invocation: NSInvocation, repeats yesOrNo: Bool) -> Timer ``` ## Parameters `ti` The number of seconds between firings of the timer. If `ti` is less than or equal to `0.0`, this method chooses the nonnegative value of `0.0001` seconds instead. `invocation` The invocation to use when the timer fires. The invocation object maintains a strong reference to its arguments until the timer is invalidated. `yesOrNo` If , the timer will repeatedly reschedule itself until invalidated. If , the timer will be invalidated after it fires. ## Return Value A new `NSTimer` object, configured according to the specified parameters. ## Discussion After `ti` seconds have elapsed, the timer fires, invoking `invocation`. ## See Also [Threading Programming Guide](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Multithreading/Introduction/Introduction.html#//apple_ref/doc/uid/10000057i) [Timer Programming Topics](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Timers/Timers.html#//apple_ref/doc/uid/10000061i) --- 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)