move pageViewController with button - ios

Question

Basically I'd like to move my PageViewController not only with swipe but also with buttons.
#IBAction func nextButtonAction(_ sender: Any){
}
My PageViewController looks like in this guide
What I have:
PageViewController
3 Viewcontrollers
Sorry if it's a duplicate didn't found exactly same situation
tried to call UIPageViewControllerDataSource on each ViewController
but didn't work also I think this is not the best approach
Edited:
This is my PageViewController
class PageVC: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
lazy var VCarr: [UIViewController] = {
return [self.VCInstance(name: "signUpVerification"),
self.VCInstance(name: "signUpVerification1"),
self.VCInstance(name: "signUpVerification2"),
]
}()
func VCInstance(name:String) -> UIViewController {
return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier:name)
}
override func viewDidLoad() {
super.viewDidLoad()
self.dataSource = self
self.delegate = self
if let firsVC = VCarr.first {
setViewControllers([firsVC], direction: .forward, animated: true, completion: nil)
}
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = VCarr.index(of: viewController) else { return nil }
let previousIndex = viewControllerIndex - 1
guard previousIndex >= 0 else {
return nil
}
return VCarr[previousIndex]
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = VCarr.index(of: viewController) else { return nil }
let nextIndex = viewControllerIndex + 1
guard nextIndex < VCarr.count else {
return nil
}
return VCarr[nextIndex]
}
}
extension PageVC {
func goToNextPage(animated: Bool = true, completion: ((Bool) -> Void)? = nil) {
if let currentViewController = VCarr.first {
if let nextPage = dataSource?.pageViewController(self, viewControllerAfter: currentViewController) //for some reasons there's nil {
setViewControllers([nextPage], direction: .forward, animated: animated, completion: completion)
}
}
}
}
this is Viewcontroller where I call it:
var pageVC = PageVC()
#IBAction func nextButtonAction(_ sender: Any){
pageVC.goToNextPage()
}
Solution:
YourViewController: {
#IBAction func nextButtonAction(_ sender: Any){
let pageViewController = self.parent as! PageVC
pageViewController.nextPageWithIndex(index: 1)
}
}
PageViewController: {
func nextPageWithIndex(index: Int) {
setViewControllers([VCarr[index]], direction: .forward, animated: true, completion: nil)
}
}

Answer 1

To move page viewController to by button click you can achieve very simply by using following extension
extension UIPageViewController {
func goToNextPage(animated: Bool = true, completion: ((Bool) -> Void)? = nil) {
if let currentViewController = viewControllers?[0] {
if let nextPage = dataSource?.pageViewController(self, viewControllerAfter: currentViewController) {
setViewControllers([nextPage], direction: .forward, animated: animated, completion: completion)
}
}
}
func goToPreviousPage(animated: Bool = true, completion: ((Bool) -> Void)? = nil) {
if let currentViewController = viewControllers?[0] {
if let previousPage = dataSource?.pageViewController(self, viewControllerBefore: currentViewController){
setViewControllers([previousPage], direction: .reverse, animated: true, completion: completion)
}
}
}
}
To move forward
self.pageViewController.goToNextPage()
To move backward
self.pageViewController.goToPreviousPage()
don't forget to check whether the index available or not
for example:
if pageArray.count > currentIdex {
self.pageViewController.goToNextPage()
}
Hope this will help you

Answer 2

Try adding this method in your button Action for moving from first View Controller to second:
self.pageViewController.setViewControllers([self.viewControllerAtIndex(1)!], direction: .forward, animated: true, completion: nil)
pageControl2.currentPage = 1
Rest you can add your current PageTracker using PageControl.
self.pageViewController.setViewControllers([self.viewControllerAtIndex(pageControl.currentPage + 1)!], direction: .forward, animated: true, completion: nil)
pageControl.currentPage += 1