swift - nstimer 无法正常工作，显示相同的数据，并且页面 Controller 也不指示页面

Question

我想实现页面 Controller 并为页面 Controller 设置计时器

这里我使用了传递标签的对象的标签数组

但是在这里我获得了相同的值，页面 Controller 也没有移动，当在标签中显示相同的数据时，请帮助我解决这个问题......提前致谢。这是我的代码:

override func viewDidLoad() 
 {
  super.viewDidLoad()
  arrPageTitle = ["In SignUp screen user can able to input the first name, last name, emailid and password.", "After SignUp email verification link has been send to his mail then add basic profile information and sport preferences.", "In Profile setting can view profile, privacy and notifications, friends, account and championships won."];
  self.pageViewController = self.storyboard?.instantiateViewController(withIdentifier: "myPageviewcontroller") as! UIPageViewController
  self.pageViewController.dataSource = self
  let initialContentviewcontroller = self.getViewControllerAtIndex(index: 0) as PageContentViewController
  let viewcontrollers = NSArray(object: initialContentviewcontroller)
  self.pageViewController.setViewControllers(viewcontrollers as? [UIViewController], direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)
  self.pageViewController.view.frame = CGRect(x: 0, y: 50, width:self.view.frame.width,height: 350)
  self.addChildViewController(self.pageViewController)
  self.view.addSubview(self.pageViewController.view)
  self.pageViewController.didMove(toParentViewController: self)
  timer = Timer.scheduledTimer(timeInterval: 2.0, target: self, selector: (#selector(StartUpPage.advancePage)), userInfo: nil, repeats: true)
 }

func advancePage () 
 {
   let pvcs = pageViewController.childViewControllers as! [PageContentViewController]
   let itemIndex = pvcs[0].pageIndex
   let firstController = getViewControllerAtIndex(index: itemIndex+1)
   let startingViewControllers = [firstController]
   pageViewController.setViewControllers(startingViewControllers, direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)
 }

func getViewControllerAtIndex(index: Int) -> PageContentViewController
 { // Create a new view controller and pass suitable data.
    let pageContentViewController = self.storyboard?.instantiateViewController(withIdentifier: "PageContentViewController") as! PageContentViewController
            pageContentViewController.strTitle = "\(arrPageTitle[index])"
     pageContentViewController.pageIndex = index
     return pageContentViewController
 }


func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController?
 {
   let viewController = viewController as! PageContentViewController
   var index = viewController.pageIndex as Int
   if(index == 0 || index == NSNotFound) { 
       return nil
    }
   index -= 1
   return self.getViewControllerAtIndex(index: index)
 }

public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController?
 {
   let viewController = viewController as! PageContentViewController
   var index = viewController.pageIndex as Int
   if((index == NSNotFound)) {
       return nil
    }
   index += 1
   if(index == arrPageTitle.count) {
      return nil
   }
  return self.getViewControllerAtIndex(index: index)
}

public func presentationCount(for pageViewController: UIPageViewController) -> Int
  { 
     return arrPageTitle.count
  }
public func presentationIndex(for pageViewController: UIPageViewController) -> Int
  {
      return 0
  }

Answer 1

func advancePage ()
{
    UpdateCounter += 1

    if  UpdateCounter > 2 {
        UpdateCounter = 0

    }
    var nextviewcontroller = self.getViewControllerAtIndex(index: UpdateCounter)
    if (nextviewcontroller .isEqual(nil)) {
        UpdateCounter = 0

        nextviewcontroller = self.getViewControllerAtIndex(index: UpdateCounter)
    }

    let startingViewControllers = [nextviewcontroller]
    pageViewController.setViewControllers(startingViewControllers, direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)
    pagecontroller.currentPage = UpdateCounter
   pagecontroller.pageIndicatorTintColor = UIColor.lightGray
    pagecontroller.currentPageIndicatorTintColor = UIColor.red

    print(UpdateCounter)



    }

尝试使用此代码希望能起作用