# init(fireAt:interval:target:selector:userInfo:repeats:) Initializes a timer using the specified object and selector. ``` init(fireAt date: Date, interval ti: TimeInterval, target t: Any, selector s: Selector, userInfo ui: Any?, repeats rep: Bool) ``` ## Parameters `date` The time at which the timer should first fire. `ti` For a repeating timer, this parameter contains 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. `t` 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. `s` 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 ``` `ui` 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`. `rep` If , the timer will repeatedly reschedule itself until invalidated. If , the timer will be invalidated after it fires. ## Return Value The receiver, initialized such that, when added to a run loop, it will fire at `date` and then, if `repeats` is , every `ti` after that. ## Discussion You must add the new timer to a run loop, using [`add(_:forMode:)`](/documentation/Foundation/RunLoop/add(_:forMode:)-392ag). Upon firing, the timer sends 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)