Swift timer is not executing on precise time

Asked Apr 11 '19 at 11:33

Active Apr 11 '19 at 12:35

Viewed 222 times

We have logged event for every 60 second, but a few events are not precise.

Here is event log:-

seeesion ==== 2019-04-11T14:51:09

seeesion ==== 2019-04-11T14:52:09

seeesion ==== 2019-04-11T14:53:09

seeesion ==== 2019-04-11T14:54:19

seeesion ==== 2019-04-11T14:55:09

seeesion ==== 2019-04-11T14:56:09

seeesion ==== 2019-04-11T14:57:09

We have bolded the incorrect event.

self.sessionTimer = Timer.scheduledTimer(withTimeInterval: 
TimeInterval(self.eventDuration), repeats: true, block: { (timer) in

print("seeesion ==== \(Formatter.preciseLocalTime.string(from:Date()))")

})

edited Apr 11 '19 at 12:35

Hans Keﬆing

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asked Apr 11 '19 at 11:33

Manoj Rlogical

Well, no timer is precise enough, so depending on your device CPU load it may fire a bit later. – user28434'mstep Apr 11 '19 at 11:35
3

The timer is approximate, but 10 seconds seems extreme. Are you doing any long running functions on the main thread? – vacawama Apr 11 '19 at 11:35
2

Have a look at https://stackoverflow.com/questions/43746336/high-precision-timer-in-swift if you need a precise timer. – Martin R Apr 11 '19 at 11:37
2

“App Nap” might be a reason – if the app is “inactive” then timers are coalesced aggressively. – Martin R Apr 11 '19 at 11:41
@vacawama we are developing macOS application which required high precise time.there is no any function right. – Manoj Rlogical Apr 11 '19 at 12:38
Try it with `DispatchQue`. – El Tomato Apr 11 '19 at 12:52

Swift timer is not executing on precise time

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