Stop chain animations and reset on UIPageController page change - animation

Question

I have UIPageViewController with 5 pages. It's on boarding animated UIViewControllers animations on each page. I researched for days and couldn't find the way to stop animations and reset the page after scroll(page change) occurs.
My UIPageViewController is set up like this:
class BoardingPageViewController: UIPageViewController {
override func viewDidLoad() {
super.viewDidLoad()
dataSource = self
delegate = self
setViewControllers([getStepOne()], direction: .forward, animated: false, completion: nil)
}
override var preferredStatusBarStyle: UIStatusBarStyle {
return .lightContent
}
func getStepOne() -> BoardView1ViewController {
return storyboard!.instantiateViewController(withIdentifier: "BoardView1") as! BoardView1ViewController
}
func getStepTwo() -> BoardView2ViewController {
return storyboard!.instantiateViewController(withIdentifier: "BoardView2") as! BoardView2ViewController
}
func getStepThree() -> BoardView3ViewController {
return storyboard!.instantiateViewController(withIdentifier: "BoardView3") as! BoardView3ViewController
}
func getStepFour() -> BoardView4ViewController {
return storyboard!.instantiateViewController(withIdentifier: "BoardView4") as! BoardView4ViewController
}
func getStepFive() -> BoardView5ViewController {
return storyboard!.instantiateViewController(withIdentifier: "BoardView5") as! BoardView5ViewController
}
}
extension BoardingPageViewController : UIPageViewControllerDataSource {
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
if viewController.isKind(of: BoardView5ViewController.self) {
// 5 -> 4
return getStepFour()
} else if viewController.isKind(of: BoardView4ViewController.self) {
// 4 -> 3
return getStepThree()
} else if viewController.isKind(of: BoardView3ViewController.self) {
// 3 -> 2
return getStepTwo()
} else if viewController.isKind(of: BoardView2ViewController.self) {
// 2 -> 1
return getStepOne()
} else {
// 0 -> end of the road
return nil
}
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
if viewController.isKind(of: BoardView1ViewController.self) {
// 0 -> 1
return getStepTwo()
} else if viewController.isKind(of: BoardView2ViewController.self) {
// 1 -> 2
return getStepThree()
} else if viewController.isKind(of: BoardView3ViewController.self) {
// 1 -> 2
return getStepFour()
} else if viewController.isKind(of: BoardView4ViewController.self) {
// 1 -> 2
return getStepFive()
} else {
// 2 -> end of the road
return nil
}
}
func presentationCount(for pageViewController: UIPageViewController) -> Int {
return 5
}
func presentationIndex(for pageViewController: UIPageViewController) -> Int {
return 0
}
}
extension BoardingPageViewController : UIPageViewControllerDelegate {
}
And my UIViewControllers are all similar with simple animations. I tried to making this happen with having chainAni value switch to false and call it on ViewDidDisappear. But it doesn't work if page switch happens in the middle of animation.
override func viewDidAppear(_ animated: Bool) {
chainAni = true
ani0()
}
func ani0() {
if chainAni != true {
return
}
UIView.animate(withDuration: 1, delay: 1, animations: {
self.handPic.alpha = 1
}) { (false) in
self.ani1()
}
}
func ani1() {
if chainAni != true {
return
}
UIView.animate(withDuration: 1.5, delay: 1, usingSpringWithDamping: 0.5, initialSpringVelocity: 0, options: [], animations: {
self.highlightAction(any: self.handPic)
self.highlightAction(any: self.folderBtn)
}) { (false) in
self.ani2()
}
}
func ani2() {
if chainAni != true {
return
}
UIView.animate(withDuration: 1.5, delay: 1, animations: {
self.unhighlightAction(any: self.handPic)
self.unhighlightAction(any: self.folderBtn)
}) { (false) in
self.ani3()
}
}
func ani3() {
if chainAni != true {
return
}
UIView.animate(withDuration: 0.5, delay: 0, animations: {
self.handPic.alpha = 0
self.alertImg.alpha = 1
self.alertImg.transform = .identity
}) { (false) in
self.ani4()
}
}
func clearAni() {
alertImg.image = #imageLiteral(resourceName: "alert1")
darkView.removeFromSuperview()
screenView.removeFromSuperview()
mainImg.alpha = 1
alertImg.alpha = 0
alert2Img.alpha = 0
handPic.alpha = 0
handPic.transform = .identity
hand2Pic.alpha = 0
hand2Pic.transform = .identity
newFolderImg.alpha = 0
newFolderImg.transform = .identity
}
override func viewDidDisappear(_ animated: Bool) {
clearAni()
chainAni = false
}

Answer 1

So, I figured I have to remove every animation from it's superview layer.
func clearAni() {
alertImg.image = #imageLiteral(resourceName: "alert1")
mainImg.layer.removeAllAnimations()
mainLbl.layer.removeAllAnimations()
alertImg.layer.removeAllAnimations()
alert2Img.layer.removeAllAnimations()
folderBtn.layer.removeAllAnimations()
handPic.layer.removeAllAnimations()
hand2Pic.layer.removeAllAnimations()
darkView.layer.removeAllAnimations()
mainImg.alpha = 1
alertImg.alpha = 0
alert2Img.alpha = 0
handPic.alpha = 0
handPic.transform = .identity
hand2Pic.alpha = 0
hand2Pic.transform = .identity
newFolderImg.alpha = 0
newFolderImg.transform = .identity
}