UIpageViewController And Timer - swift

Question

i have a UIPageViewController in one of My UICollectionViewCell at the top of my screen(height = frame.height/3) it contains a number of images
and it is working good but i need it to be scrolled to the next image automattically every 3 seconds what should i do?
import UIKit
class PageViewController: UIPageViewController , UIPageViewControllerDataSource{
var scrollingTimer = Timer()
let imageNames = ["Apple_Watch_Main" , "Pic2" , "Pic3"]
override func viewDidLoad() {
super.viewDidLoad()
dataSource = self
let frameViewController = FrameViewController()
frameViewController.imageName = imageNames.first
let viewControllers = [frameViewController]
setViewControllers(viewControllers, direction: .forward, animated: true, completion: nil)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
let currentImageName = (viewController as! FrameViewController).imageName
let currentIndex = imageNames.index(of: currentImageName!)
if currentIndex! > 0 {
let frameViewController = FrameViewController()
frameViewController.imageName = imageNames[currentIndex! - 1]
return frameViewController
}
return nil
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
let currentImageName = (viewController as! FrameViewController).imageName
let currentIndex = imageNames.index(of: currentImageName!)
if currentIndex! < imageNames.count - 1 {
let frameViewController = FrameViewController()
frameViewController.imageName = imageNames[currentIndex! + 1]
return frameViewController
}
return nil
}
}
and i added to my cell here
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
switch indexPath.item {
case 0 :
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as!ImageCell
let pagecontroller = PageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
self.addChildViewController(pagecontroller)
cell.addSubview(pagecontroller.view)
pagecontroller.view.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height/3)
return cell
case 1 :
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "filterandorganize", for: indexPath) as! FilterAndOrganize
return cell
case 2 :
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Offers", for: indexPath) as! Offers
return cell
case 3 :
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "OfferedProducts", for: indexPath) as! OfferedProducts
cell.firstViewController = self
return cell
default:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Offers", for: indexPath) as! Offers
return cell
}
}
in case 0
I searched a lot and i found some questions like this but without any complete and correct answer
HERE IS THE ANSWER I FOUND but it still have one bug and that is when the user swipes it self the autoscroll is not perfect and maybe jump of one pic to another
class PageViewController: UIPageViewController , UIPageViewControllerDataSource{
var index = 0
let imageNames = ["Apple_Watch_Main" , "Pic2" , "Pic3"]
override func viewDidLoad() {
super.viewDidLoad()
dataSource = self
let frameViewController = FrameViewController()
frameViewController.imageName = imageNames[index]
index += 1
let viewControllers = [frameViewController]
setViewControllers(viewControllers, direction: .forward, animated: true, completion: nil)
Timer.scheduledTimer(timeInterval: 6.0 ,
target: self,
selector: #selector(myFunc(_:)),
userInfo: index,
repeats: true)
}
//FIXME: needs some fixes
func myFunc(_ timer: Timer) {
if index == imageNames.count {
index = 0
}
else {
self.changePIC(index)
index += 1
}
}
func changePIC(_ i: Int) {
let frameViewController = FrameViewController()
frameViewController.imageName = imageNames[i]
let viewControllers = [frameViewController]
setViewControllers(viewControllers, direction: .forward, animated: true, completion: nil)
}

Answer 1

First crate a Timer with timeInterval and option repeats seat to true.
Example:
Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(scrollToNextItem), userInfo: nil, repeats: true)
Now you have Timer that will trigger scrollToNextItem method every 3 seconds.
Now read about setViewControllers(_:direction:animated:completion:) to know how to set view controllers to be displayed.
Than implement scrollToNextItem method with required logic.