Programmatically turns the page, indicators does not change

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I try the following approach found here

extension UIPageViewController {

func goToNextPage(){

    guard let currentViewController = self.viewControllers?.first else { return }

    guard let nextViewController = dataSource?.pageViewController( self, viewControllerAfter: currentViewController ) else { return }

    setViewControllers([nextViewController], direction: .forward, animated: true, completion: nil)

   }
}

It works, but there is one issue:

When the page is turned programatically, the indicator does not move. It seems that they move only when user turns. page with swipe

that's how indicators should look like after programmatic turn is performed:

instead they remain unchanged

Which leads to issue that hierarchy shown by indicators is rather [2,0,1] instead of [0,1,2]

This is how I implement indicators:

func presentationCount(for PageViewController:UIPageViewController) -> Int {


    return 3

}

func presentationIndex(for PageViewController:UIPageViewController) -> Int {

    return 0
}

How to make dots indicators move when the page is turned programatically?


Unfortunately you can't update UIPageControl embedded in UIPageViewController. However, you can have your own UIPageControl in UIPageViewController in order to get full control. Then you can update UIPageControl property programmatically upon updating your Page. Have a look at this article.

UIPageViewController programmatically turning pages does not , You can implement the following data source protocol method with the correct page index: By default, a Value Change event that the Event Structure can recognize is only generated for direct user interactions with the Front Panel. In the case described in the Issue Details section above, the indicator value is changed programmatically, thus LabVIEW dose not generate a Value Change event. Furthermore, Value Change events do also not occur when you use VI Server, global variables, local variables, etc. to change VI or Front Panel objects programmatically.


There is a workaround get the subviews of UIPageViewController, set the value to currentPage.

for subView in self.view.subviews{
     if let pageControl = subView as? UIPageControl,
         pageControl.numberOfPages >  currentIndex{
         pageControl.currentPage = currentIndex
     }
}

Custom color and size for UIPageControl dots?, I've even found instructions on how to rotate the dot display to vertical. Each tutorial page gets an image and a text block. I should add that I don't need to change the relative spacing between the dots, I just want the whole thing larger. The indicators only update when the whole list is changed, hence why it’s not picking up the new or removed items. Off the top of my head, you would have to look at the ItemChanged method, convert the list to an observable, then add event handlers to the collection.


You can, all you need to do is maintain the page index in a variable, let's call it currentPageIndex and use the following method:

// Part of UIPageViewControllerDelegate 

func presentationIndex(for pageViewController: UIPageViewController) -> Int {
  return currentPageIndex;
}

// In your Button action, set this variable

@IBAction func nextPage(_ sender: Any) {
   var index = (pageViewController?.viewControllers?.last as! SinglePageViewController).pageIndex
   currentPageIndex = index
}

That's it!! Your page indicator should work now. I was stuck in a same situation as yours.

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We can access the selected page within the ViewPager at any time with the getCurrentItem method which returns the current page: vpPager. getCurrentItem (); // --> 2. The current page can also be changed programmatically with the . vpPager. setCurrentItem (2) With this getter and setter, we can easily access or modify the selected page at runtime.