Pause timer when scroll view's slide is being touched? - ios

Question

I am trying to automatically scroll slides in my scroll view. I am actually doing this for my onboarding screens.
However I want the timer to pause for a while when user touches the slides and start the same again when he removes his finger.
I am doing something like this but this doesn't work for the case I am asking:
in viewDidLoad -
timer = Timer.scheduledTimer(timeInterval: 4, target: self, selector: #selector(autoScroll), userInfo: nil, repeats: true)
#objc func autoScroll() {
let totalPossibleOffset = CGFloat(topImages.count - 1) * self.view.bounds.size.width
if offSet == totalPossibleOffset {
//offSet = 0 // come back to the first image after the last image
//timer.invalidate()
}
else {
offSet += self.view.bounds.size.width
}
DispatchQueue.main.async() {
UIView.animate(withDuration: 0.3, delay: 0, options: UIViewAnimationOptions.curveLinear, animations: {
self.scrollView.contentOffset.x = CGFloat(self.offSet)
}, completion: nil)
}
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let page = scrollView.contentOffset.x / scrollView.frame.size.width
pageControl.currentPage = Int(page)
self.offSet = page * scrollView.frame.size.width // this updates offset value so that automatic scroll begins from the image you arrived at manually
}
Also I have a second question: How do I start the timer interval again when user manually slides to other other. Right now, when the user slides to another slide before 4 seconds (as 4 seconds is required time to slide to another slide), say 2 seconds, he will slide to next page there after 4-2 = 2 seconds instead of 4 seconds as expected.

Answer 1

I think you should add some flag like
var isSlideTouched = false
In gesture recognizer add
isSlideTouched = true
And some code in autoScroll()
#objc func autoScroll() {
if isSlideTouched {
isSlideTouched = false
return
}