Swift: Initialization of NSTimer was never used, consider replacing with _

Question

I recently downloaded Xcode 7 and Swift 2.0. In Swift 1.2 I set a timer with the following code.

let timer = NSTimer.scheduledTimerWithTimeInterval(8.0, target: self, selector: Selector("didTimeout"), userInfo: nil, repeats: false)

I do not use the timer constant anywhere I just schedule a timer.

I was under the understanding that in order to do this I had to use the "let timer =" portion.

With Swift 2.0 I get the following warning.

Initialization of immutable value 'timer' was never used; consider replacing with assignment to '_' or removing it.

I've never seen the use of _ before so I just replaced the line above with the line below.

NSTimer.scheduledTimerWithTimeInterval(8.0, target: self, selector: Selector("didTimeout"), userInfo: nil, repeats: false)

Has not using "let timer" or "var timer" always been ok in Swift or is this new in Swift 2.0?

LinusG. · Accepted Answer · 2015-12-10 15:55:03Z

The way you did it is totally fine. If you try it, it will work.
_ is something to reduce memory, CPU and storage usage if created things are not needed. I actually do not know why they made it this way.

By the way you do not need Selector("didTimeout"). You can simply do "didTimeout:".

Hope that helps :)

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