Stop the autoscroll in scrollview on user interaction swift - ios

Question

I using the pagecontroller in my application.
it is working fine every thing it will scroll automatically for every 3 sec time and current position also changed based on user custom swipe.
But I having one issue here when user manually swipe the scrollview on that time I want to stop the auto scroll.
Please find with the my following code.
var slides:[Slide] = [];
var offSet: CGFloat = 0
override func viewDidLoad() {
super.viewDidLoad()
slides = createSlides()
setupSlideScrollView(slides: slides)
pageControl.numberOfPages = slides.count
pageControl.currentPage = 0
view.bringSubview(toFront: pageControl)
let timer = Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(autoScroll), userInfo: nil, repeats: true)
}
#objc func autoScroll() {
let totalPossibleOffset = CGFloat(slides.count - 1) * self.view.bounds.size.width
if offSet == totalPossibleOffset {
offSet = 0 // come back to the first image after the last image
}
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)
}
}

Answer 1

Add scroll view delegate and use scrollViewDidEndDragging methods when it calls just reset your timer so after 3 sec start again it working as it is.

Answer 2

The code is untested, You should check with current index with your total number slides count
Create one global index like below and change your conditions. And you need to manage this index while swipe function as well and Invalidate your timer while swipe. Your timer object should be in global
timer.invalidate()
var currentPage = 0
#objc func autoScroll() {
let totalPossibleOffset = 0
if currentPage == slides.count {
currentPage = 0 // come back to the first image after the last image
totalPossibleOffset = 0
}
else {
currentPage = currentPage + 1
totalPossibleOffset = currentPage * self.view.bounds.size.width
}
DispatchQueue.main.async() {
UIView.animate(withDuration: 0.3, delay: 0, options: UIViewAnimationOptions.curveLinear, animations: {
self.scrollView.contentOffset.x = CGFloat(totalPossibleOffset)
}, completion: nil)
}
}