Move scrollview automatically with page controller - ios

Question

Hi I am using the PageController in my application.
I have inserted all the data on scrollView.
What I want do is, I want to move the scrollview automatically like page control with specific time.
When the scrollView reaches to last page it again recall all pages speedy and start from first onwards.
I want to load/get first page very smoothly after last page completion.
Find my code with following.
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

#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: 0.1, delay: 0, options: UIView.AnimationOptions.curveLinear, animations: {
self.scrollView.scroll(topOffset:offSet, animated: true)
}, completion: nil)
}
}
extension UIScrollView {
// Bonus: Scroll
func scroll(topOffset:Float, animated: Bool) {
let ofSetValue = CGPoint(x: topOffset, y: 0)
setContentOffset(ofSetValue, animated: animated)
}
}

Answer 2

Use the following code working fine.
#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: 0.0, delay: 0, options: UIViewAnimationOptions.curveLinear, animations: {
self.scrollView.contentOffset.x = CGFloat(self.offSet)
}, completion: nil)
}
}