iOS Swift - Change UIPageViewController page using UISegmentedControl - ios

Question

I finnaly synchronized my segmentedController to the UIPageViewController in this way: when I swipe between pages, the segmented controller changes it's segment index. I want to know how to do the reverse too, when segmentedController's segment is tapped, to change the pageViewController page by segmentedController index. Here is my code:
class photoPageViewController: UIViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate, UINavigationControllerDelegate {
#IBOutlet var segmentedControl: UISegmentedControl!
private var pageViewController: UIPageViewController?
var controllers = [thePageViewController]()
var thePage = thePageViewController()
override func viewDidLoad() {
super.viewDidLoad()
createPageViewController()
setupPageControl()
}
private func createPageViewController() {
var pageController = self.storyboard!.instantiateViewControllerWithIdentifier("PageController") as! UIPageViewController
pageController.dataSource = self
pageController.delegate = self
var firstController = getItemController(thePage.itemIndex)!
var startingViewControllers: NSArray = [firstController]
pageController.setViewControllers(startingViewControllers as [AnyObject], direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
pageViewController = pageController
addChildViewController(pageViewController!)
self.view.addSubview(pageViewController!.view)
pageViewController!.didMoveToParentViewController(self)
}
private func setupPageControl() {
let appearance = UIPageControl.appearance()
appearance.pageIndicatorTintColor = UIColor.grayColor()
appearance.currentPageIndicatorTintColor = UIColor.whiteColor()
appearance.backgroundColor = UIColor.darkGrayColor()
}
func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
let itemController = viewController as! thePageViewController
if itemController.itemIndex > 0 {
return getItemController(itemController.itemIndex-1)
}
return nil
}
func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
let itemController = viewController as! thePageViewController
if itemController.itemIndex+1 < 3 {
return getItemController(itemController.itemIndex+1)
}
return nil
}
func getItemController(itemIndex: Int) -> UIViewController? {
var vc: thePageViewController? = nil
switch itemIndex {
case 0:
vc = self.storyboard!.instantiateViewControllerWithIdentifier("ViewController0") as! firstPhotoViewController
vc?.itemIndex = itemIndex
case 1:
vc = self.storyboard!.instantiateViewControllerWithIdentifier("ViewController1") as! secondPhotoViewController
vc?.itemIndex = itemIndex
case 2:
vc = self.storyboard!.instantiateViewControllerWithIdentifier("ViewController2") as! thirdPhotoViewController
vc?.itemIndex = itemIndex
default:
return nil
}
return vc
}
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
return 3
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
return 0
}
func pageViewController(photoPageViewController: UIPageViewController,
didFinishAnimating finished: Bool,
previousViewControllers pageViewController: [AnyObject],
transitionCompleted completed: Bool)
{
if (!completed)
{
return;
}
segmentedControl.selectedSegmentIndex = thePageIndex
//thePageIndex is a global variable that changes when views from pageViewController appear
}
#IBAction func segmentedFunction(sender: AnyObject) {
switch segmentedControl.selectedSegmentIndex
{
case 0:
getItemController(0)
case 1:
getItemController(1)
case 2:
getItemController(2)
default:
println("...")
}
}}

Answer 1

I think you need to change your code a little bit! In my case I create several vc and put them to one array.
func createArrayOfControllers(){
newsLenta = self.storyboard?.instantiateViewControllerWithIdentifier("NewsLentaTableViewController") as NewsLentaTableViewController
mainPage = self.storyboard?.instantiateViewControllerWithIdentifier("MainPageTableViewController") as MainPageTableViewController
onlinetranslation = self.storyboard?.instantiateViewControllerWithIdentifier("SingleTopicTableViewController") as SingleTopicTableViewController
tableViewControllers = [newsLenta, mainPage, onlinetranslation]
}
where tableViewController is global var var tableViewControllers = [UITableViewController]() ! I signed type TableViewController because all my vs's are type of table View controller. So the next function you need to change is
func viewControllerAtIndex(index : Int) -> UIViewController? {
if index > 2 || index < 0 {
return nil
}
return tableViewControllers[index]
}
In the end you just need to create action of segmentControl and reset your vc by index. Using this function:
func resetToMainPage(index: Int!) {
/* Getting the page View controller */
mainPageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("MainPageViewController") as UIPageViewController
self.mainPageViewController.dataSource = self
self.mainPageViewController.delegate = self
let pageContentViewController = self.viewControllerAtIndex(index)
segmentedControl.selectedSegmentIndex = index
self.mainPageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)
self.mainPageViewController.view.frame = CGRectMake(0, 95, self.view.frame.width, self.view.frame.height)
self.addChildViewController(mainPageViewController)
self.view.addSubview(mainPageViewController.view)
self.mainPageViewController.didMoveToParentViewController(self)
}
My question for your how do you update thePageIndex... I dont get that...

Answer 2

I found the way how to change UIPageViewController's content viewcontroller. I dont know is it right way or wrong but it works. Here is a code:
put this to viewdidload:
segmentControl.addTarget(self, action: "selectPageIndexBySegmentControl", forControlEvents: UIControlEvents.ValueChanged)
put it separte from viewdieload:
func selectPageIndexBySegmentControl(){
switch segmentControl.selectedIndex {
case 0:
println("zero index were selected")
pageContentViewController = self.viewControllerAtIndex(0)
mainPageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)
case 1:
println("first element were selected")
pageContentViewController = self.viewControllerAtIndex(1)
mainPageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)
case 2:
println("second element were selected")
pageContentViewController = self.viewControllerAtIndex(2)
mainPageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)
default:
break
}
}