# init(timeInterval:target:selector:userInfo:repeats:) Initializes a timer object with the specified object and selector. ``` init(timeInterval ti: TimeInterval, target aTarget: Any, selector aSelector: Selector, userInfo: Any?, repeats yesOrNo: Bool) ``` ## 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. `aTarget` The object to which to send the message specified by `aSelector` when the timer fires. The timer maintains a strong reference to this object until it (the timer) is invalidated. `aSelector` The message to send to `target` when the timer fires. The selector should have the following signature: `timerFireMethod:` (including a colon to indicate that the method takes an argument). The timer passes itself as the argument, thus the method would adopt the following pattern: ```objc - (void)timerFireMethod:(NSTimer *)timer ``` `userInfo` Custom user info for the timer. The timer maintains a strong reference to this object until it (the timer) is invalidated. This parameter may be `nil` . `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 You must add the new timer to a run loop, using [`add(_:forMode:)`](/documentation/Foundation/RunLoop/add(_:forMode:)-392ag). Then, after `ti` seconds have elapsed, the timer fires, sending the message `aSelector` to `target`. (If the timer is configured to repeat, there is no need to subsequently re-add the timer to the run loop.) --- 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)