PageViewController current page index in Swift

Question

I want to get current index of a pageViewController, I don\'t know how I get the visible pages index.

func pageViewController(pageViewController: UIPageViewContr         


        

Answer 1

Dont forget to set pageviewcontroller's delegate.

 func createPageViewController() {
    // Create page view controller
    pageViewController = storyboard?.instantiateViewController(withIdentifier: "PageViewController") as? UIPageViewController
    pageViewController?.delegate = self
    pageViewController?.dataSource = self

    let startingViewController: ChildViewController = viewControllerAtIndex(index: 0)!
    let viewControllers: Array = [startingViewController]
    pageViewController?.setViewControllers(viewControllers, direction: .forward, animated: true, completion: nil)

    self.addChildViewController(pageViewController!)
    self.view.frame = CGRect(x: 0, y: 0, width: self.view.bounds.size.width, height: self.view.bounds.size.height)
    self.view.addSubview((pageViewController?.view)!)
    self.pageViewController?.didMove(toParentViewController: self)
}

func viewControllerAtIndex(index: Int) -> ChildViewController? {  
    // return nil here, if there won't be any page in pageviewcontroller

    // Create a new view controller and pass suitable data.
    let pageContentViewController: ChildViewController = storyboard?.instantiateViewController(withIdentifier: "ChildViewController") as! ChildViewController

    pageContentViewController.pageIndex = index
    return pageContentViewController
}

//Also add viewControllerAfter and viewControllerBefore methods

func pageViewController(_ pageViewController: UIPageViewController, willTransitionTo pendingViewControllers: [UIViewController]) {
    self.pendingIndex = (pendingViewControllers.first as! ChildViewController).pageIndex
}

func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
    if completed {
        self.currentIndex = self.pendingIndex!
        //Perform your task here
    }
}