UIPage ViewController, i want to navigate the other second viewcontroller from non uipage viewcontroller

Question

I need Code for UIpageViewcontroller, which will work like below MVC of Image.

PageViewController Flow

Edit:

When I Click on next button of "Other ViewController", it will call ViewController 2 of UIPageViewcontroller. The exact flow is shown in above image.

Answer 1

ok this is one way to do it

first you need to create a UIPageViewController in the storyboard and set the class to same of this code

in a new swift file copy and paste this

class PageVC: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
//make sure the storyboard PageviewControllers class is set to this class or it wont work

lazy var VCArray: [UIViewController] = {
    //here is where your viewController pages go. in storyboard create multiple viewControllers and give them a storyboard ID here is where the storyboard IDs will be put in
    return [self.VCInstance(name: "firstVC"),
            self.VCInstance(name: "secondVC"),
            self.VCInstance(name: "thirdVC")]
}()

private func VCInstance(name: String) -> UIViewController {
        return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: name)
}

override func viewDidLoad() {
    super.viewDidLoad()

    self.delegate = self
    self.dataSource = self

    if let firstVC = VCArray.first {
        setViewControllers([firstVC], direction: .forward, animated: true, completion: nil)
    }


}
override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    for view in self.view.subviews {
        if view is UIScrollView {
            view.frame = UIScreen.main.bounds
        } else if view is UIPageControl {
            view.backgroundColor = UIColor.clear
        }
    }
}

public func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
    guard let viewControllerIndex = VCArray.index(of: viewController) else {
        return nil
    }

    let previousIndex = viewControllerIndex - 1

    guard previousIndex >= 0 else {
        return VCArray.last
    }

    guard VCArray.count > previousIndex else {
        return nil
    }
    return VCArray[previousIndex]
}

public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
    guard let viewControllerIndex = VCArray.index(of: viewController) else {
        return nil
    }

    let nextIndex = viewControllerIndex + 1

    guard nextIndex < VCArray.count else {
        return VCArray.first
    }

    guard VCArray.count > nextIndex else {
        return nil
    }
    return VCArray[nextIndex]
}
//this is optional for the page counter at the bottom
public func presentationCount(for pageViewController: UIPageViewController) -> Int {
    return VCArray.count
}
//this is optional for the page counter at the bottom
public func presentationIndex(for pageViewController: UIPageViewController) -> Int {
    guard let firstViewController = viewControllers?.first, let firstViewControllerIndex = VCArray.index(of: firstViewController) else {
        return 0
    }
    return firstViewControllerIndex
}

}

Explanation-

the code above is very customizable you can change whether or not you have a page counter at the bottom or how many pages are displayed by using this it turns multiple storyboard viewControllers into a single-paged viewController and because the pages are individual storyboard viewControllers you can put whatever you want on the pages....if you are still confused check out this video on YouTube