I'm trying to make a timer count up the seconds I'm holding on a button.(holding to record a video) and its just not working correctly...sometimes its skipping seconds & sometimes just freezes and then speeding up to catch up ...i really need your help solving this, i need the timer to be as fluid and as constant as it can get, thanks.
//Timer Variables:
var recordingCounter : Timer!
var minutes: Int = 0
var seconds: Int = 0
var counterString : String = ""
func longTap(_ sender: UIGestureRecognizer){
if sender.state == .ended {
print("UIGestureRecognizerStateEnded")
recordingCounter.invalidate()
seconds = 0
minutes = 0
if self.timerView.alpha == 1.0 {
UIView.animate(withDuration: 0.2, animations: {
self.timerView.alpha = 0.0
self.timerView.isHidden = true
self.recordingCounter.invalidate()
self.seconds = 0
self.minutes = 0
self.counterString = "00:00"
self.countingLabel.text = self.counterString
})
}
return
}else if sender.state == .began {
timerView.isHidden = false
UIView.animate(withDuration: 0.2, animations: {
self.timerView.alpha = 1.0
})
print("UIGestureRecognizerStateBegan.")
recordingCounter = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateCounter), userInfo: nil, repeats: true)
}
}
func updateCounter() {
seconds += 1
if seconds == 60 {
minutes += 1
seconds = 0
}
let secondsString = seconds > 9 ? "\(seconds)" : "0\(seconds)"
let minutesString = minutes > 9 ? "\(minutes)" : "0\(minutes)"
counterString = "\(minutesString):\(secondsString)"
countingLabel.text = counterString
}
btw I'm running a VideoPreviewLayer of my custom AVFoundation Camera in the same time.. might cause the problems?
The Timer works in this same DispatchQueue as user interaction (for example scrolling in the UITableView, tap in the UIGestureRecognizer or holding on a UIbutton). So when the user does anything, then the Timer will freeze for a moment.
You can solve this problem by using, for example, AsyncTimer.