Perform segue from onboarding / tutorial screen - ios

Question

I am using the UIPageViewController for an on boarding / tutorial screen, and my problem is as follows:
When the user is on the last page of the tutorial, i want a left swipe gesture not to try and swipe the page controller, but instead to perform a segue to the registration page. I threw a print statement into the viewDidLoad in the UIViewController for the last page of the tutorial, and it registers.
In that same viewDidLoad I create my gestures to perform the segue, but nothing happens. I even tried putting the performSegue inside of the viewDidLoad, but nothing happened. I have my segue connected to the UIPageViewController as well as my GrowController, and neither register. I'm at a loss!
This is the UIViewController for the last page of tutorial
class GrowController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
print("*********************************")
createGesture()
// performSegue(withIdentifier: "ShowRegister", sender: self)
}
func createGesture() {
let showReg = UISwipeGestureRecognizer(target: self, action: #selector(showRegister))
showReg.direction = .left
view.addGestureRecognizer(showReg)
}
func showRegister(gesture: UISwipeGestureRecognizer) {
performSegue(withIdentifier: "showRegister", sender: self)
}
}
This is the UIPageViewController that handles the tutorial logic
class TutorialViewController: UIPageViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource {
var viewControllerIndex: Int?
lazy var tutorialArray: [UIViewController] = {
return [self.tutorialInstance(name: "page1"), self.tutorialInstance(name: "page2"), self.tutorialInstance(name: "page3")]
}()
private func tutorialInstance(name: String?) -> UIViewController {
return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: name!)
}
override func viewDidLoad() {
super.viewDidLoad()
if let image = UIImage(named: "export.png") {
view.backgroundColor = UIColor.init(patternImage: image)
} else {
print("Error")
}
self.dataSource = self
self.delegate = self
if let firstViewController = tutorialArray.first {
setViewControllers([firstViewController], direction: .forward, animated: false, completion: nil)
}
}
These are the delgate and datasource functions
// Page View Controller delegate functions
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = tutorialArray.index(of: viewController) else {
return nil
}
let previousIndex = viewControllerIndex - 1
guard previousIndex >= 0 else {
return nil
}
guard tutorialArray.count > previousIndex else {
performSegue(withIdentifier: "ShowRegister", sender: self) // Added this line just testng around, nothing happend here though.
return nil
}
return tutorialArray[previousIndex]
}
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = tutorialArray.index(of: viewController) else {
return nil
}
let nextIndex = viewControllerIndex + 1
guard nextIndex < tutorialArray.count else {
return nil
}
guard tutorialArray.count > nextIndex else {
return nil
}
return tutorialArray[nextIndex]
}
public func presentationCount(for pageViewController: UIPageViewController) -> Int {
return tutorialArray.count
}
public func presentationIndex(for pageViewController: UIPageViewController) -> Int {
guard let firstViewController = viewControllers?.first, let firstViewControllerIndex = tutorialArray.index(of: firstViewController) else {
return 0
}
return firstViewControllerIndex
}
Lots of code for what is probably a simple answer.
tl;dr - How can I make a swipe gesture perform a segue from a specific page of the UIPageViewController

Answer 1

There is a delegate method that you can implement pageViewController(_:willTransitionTo:) but I don't know that its worth the trouble. Maybe just put another view in front of it and put a swipe gesture recognizer view in that view and use the gesture recognized to manually change the page or segue to the new controller.