Transition between View Controllers with button (UIPageViewController Items) - swift

Question

I have 2 UIViewControllers as items of UIPageViewController. It works well for slide, but i want to move from pageOne to pageTwo with button's action. How i can do that?
Here is my code and storyboard preview:
Contents of Pager.swift :
import UIKit
class Pager: UIPageViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource, UIScrollViewDelegate
{
var viewsArray: [UIViewController] = []
var pageOne: UIViewController = UIViewController()
var pageTwo: UIViewController = UIViewController()
var currentIndex = 0
var previousIndex = 0
var nextIndex = 0
override func viewDidLoad()
{
super.viewDidLoad()
self.delegate = self
self.dataSource = self
pageOne = (storyboard?.instantiateViewController(withIdentifier: "pageOne"))!
pageTwo = (storyboard?.instantiateViewController(withIdentifier: "pageTwo"))!
viewsArray.append(pageOne)
viewsArray.append(pageTwo)
setViewControllers([pageOne], direction: .forward, animated: true, completion: nil)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController?
{
currentIndex = viewsArray.index(of: viewController)!
if currentIndex == 1
{
return nil
}
else
{
nextIndex = abs((currentIndex + 1) % viewsArray.count)
return viewsArray[nextIndex]
}
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController?
{
currentIndex = viewsArray.index(of: viewController)!
if currentIndex == 0
{
return nil
}
else
{
previousIndex = abs((currentIndex - 1) % viewsArray.count)
return viewsArray[previousIndex]
}
}
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int
{
return viewsArray.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int
{
return 0
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
}
}
Contents of PageOne.swift :
import UIKit
class PageOne: UIViewController
{
var pager = Pager()
override func viewDidLoad()
{
super.viewDidLoad()
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
}
#IBAction func forwardButton(_ sender: Any)
{
pager.setViewControllers([pager.pageOne], direction: .forward, animated: true, completion: nil)
}
}

Answer 1

You need to write below line
pageController?.setViewControllers([YOUR_VIEW_CONTROLLER], direction: direction, animated: true, completion: nil)
give proper direction either forward or reverse based on which controller you are at
hope this will help you
You need to pass pager to your both viewcontrollers
pageOne.pager = self
pageTwo.pager = self