PageViewController actuelle de la page index de Swift

Je veux obtenir l'indice actuel d'un pageViewController, je ne sais pas comment je reçois le visible pages d'index.

func pageViewController(pageViewController: UIPageViewController, didFinishAnimating finished: Bool,previousViewControllers: [UIViewController],transitionCompleted completed: Bool)
{
    //How to get it?

}
voir ce lien peut être de vous aide à stackoverflow.com/questions/8400870/...
Que font les paramètres fournis par le dites-vous?

OriginalL'auteur LeNI | 2015-09-28

  1. 26

    Vous pouvez utiliser didFinishAnimating, et de définir des balises pour viewcontrollers. essayez cette

    func pageViewController(pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool)
{
   if (!completed)
  {
    return
  }
  self.pageControl.currentPageIndex = pageViewController.viewControllers!.first!.view.tag //Page Index
}
    mais pageViewController.viewControllers!.first!.view.tag est toujours 0 parce que c'est toujours le premier 🙁
    il doit y avoir une meilleure façon de le faire qu'à l'aide de balises...
    Oui David Chercher, vous pouvez utiliser le func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool)

    OriginalL'auteur manukv

  2. 8

    Swift 3: plein programmatique PageViewController exemple pour obtenir/mise à l'index de la page sans afficher de marquage:

    enum PageViewType:String {
case green = "greenView"
case blue = "blueView"
case red = "redView"  
}
class MyPageViewController: UIPageViewController {
private (set) lazy var orderedViewControllers:[UIViewController] = {
return [self.newPageView(.green),
self.newPageView(.blue),
self.newPageView(.red)
]
}
var currentIndex:Int {
get {
return orderedViewControllers.index(of: self.viewControllers!.first!)!
}
set {
guard newValue >= 0,
newValue < orderedViewControllers.count else {
return
}
let vc = orderedViewControllers[newValue]
let direction:UIPageViewControllerNavigationDirection = newValue > currentIndex ? .forward : .reverse            
self.setViewControllers([vc], direction: direction, animated: true, completion: nil) 
}
}
override func viewDidLoad() {
super.viewDidLoad()
dataSource = self
if let firstViewController = orderedViewControllers.first {
setViewControllers([firstViewController],
direction: .forward,
animated: true,
completion: nil)
}
}
private func newPageView(_ viewType:PageViewType) -> UIViewController {
let vc = self.storyboard?.instantiateViewController(withIdentifier: viewType.rawValue)       
return vc
}
}

    UIPageViewController source de données de mise en œuvre:

    extension MyPageViewController:UIPageViewControllerDataSource {
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
let previousIndex = currentIndex - 1
guard previousIndex >= 0 else {
return nil
}
guard orderedViewControllers.count > previousIndex else {
return nil
}
return orderedViewControllers[previousIndex]   
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {         
let nextIndex = currentIndex + 1
guard orderedViewControllers.count != nextIndex else {
return nil
}
guard orderedViewControllers.count > nextIndex else {
return nil
}
return orderedViewControllers[nextIndex]
}
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
return orderedViewControllers.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
return currentIndex
}
}
    Je vous remercie.Il fonctionne parfaitement.
    comment appeler currentIndex fonction dans viecontroller

    OriginalL'auteur Peter Kreinz

  3. 7

    Dans Swift 3

    Remplacer didFinishAnimating fonction de UIPageViewControllerDelegate comme ceci:

    func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
if completed {
if let currentViewController = pageViewController.viewControllers![0] as? WalkthroughContentViewController {
pageControl.currentPage = currentViewController.index
}
}
}

    où WalkthroughContentViewController est le UIViewController présenté par UIPageViewController

    N'oubliez pas de garder un indice de la variable à l'intérieur de la WalkthroughContentViewController. Aussi, dans la méthode viewDidLoad ensemble:

    delegate = self
    Merci, ça marche!!!!

    OriginalL'auteur George Bikas

  4. 2

    Essayer.. 

    func pageViewController(pageViewController: UIPageViewController,didFinishAnimating finished: Bool,previousViewControllers: [UIViewController],transitionCompleted completed: Bool){
guard completed else { return }
self.pageControl.currentPage = pageViewController.viewControllers!.first!.view.tag
}
    oui jeu de tag, est le bon choix merci
    L'obtention de la Valeur de l'erreur de type 'UIPageVieController' est pas membre de 'currentPage'

    OriginalL'auteur Sankalap Yaduraj Singh

  5. 0

    N'oubliez pas de positionner pageviewcontroller son délégué. 

     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
    }
}

    OriginalL'auteur Rupak Shakya

  6. 0

    Vous pouvez utiliser la méthode suivante:

    func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
guard
completed,
let viewControllerIndex = tutorialViews.index(of: pageViewController.viewControllers!.first!) else
return
}
self.currentIndex = viewControllerIndex
}

    Où tutorialViews est un ensemble de pages (ViewControllers).

    Et initialiser currentIndex comme ça:

    var currentIndex = 0 {
didSet {
self.updateContentForPage(withIndex: currentIndex)
}
}

    OriginalL'auteur Mykyta Savchuk

  7. 0

    Créer une méthode dans, par exemple, la classe -> WalkthroughPageViewController), tels que:

     /* The method takes in a page index and creates the next content view controller. If the controller can
be created, we call the built-in setViewControllers method and navigate to the next view controller.*/
func forward(index: Int) {
if let nextViewController = contentViewController(at: index + 1) {
setViewControllers([nextViewController], direction: .forward, animated: true, completion: nil)
}
}

    Et dans la classe qui contrôle dit UIPageController, qui sera un contrôleur de vue (classe -> WalkthroughContentViewController) et qui contient un bouton qui passe à la page suivante et les mises à jour de la propriété "contrôle pagecontrol.currentPage" (qui est lui-même UIpageControl), met en œuvre:

    class WalkthroughContentViewController: UIViewController {
@IBOutlet var headingLabel: UILabel!
@IBOutlet var contentLabel: UILabel!
@IBOutlet var forwardButton: UIButton!
@IBOutlet var pageControl: UIPageControl!
@IBOutlet var contentImageView: UIImageView!
var index     = 0
var heading   = ""
var content   = ""
var imageFile = ""
override func viewDidLoad() {
super.viewDidLoad()
headingLabel.text = heading
contentLabel.text = content
contentImageView.image = UIImage(named: imageFile)
//Update the 'currentPage' property of the page control.
    pageControl.currentPage = index
if case 0...1 = index {
forwardButton.setTitle("NEXT", for : .normal)
} else if case 2 = index {
forwardButton.setTitle("DONE", for : .normal)
}
}
//MARK: - Actions

@IBAction func nextButtonTapped(sender: UIButton) {
switch index {
case 0...1: /* Get the parent controller & call to the "forward" method from the 'WalkthroughPageViewController'. */
let pageViewController = parent as! WalkthroughPageViewController
pageViewController.forward(index: index)
case 2: /* Dismiss the page view controller and show the main screen of the app*/
dismiss(animated: true, completion: nil)
default: break
}
}

    }

    OriginalL'auteur juan carlos merlos albarracin