Get real index of dynamic pages uiviewcontroller - swift

Question

How can I get the 'real' current index of the active page? I have tried every solution on stack overflow with no luck. So vc.pageIndex gives me the wrong value back. How can I solve this?
My code:
import UIKit
class PageControl: BasePageViewController, UIPageViewControllerDataSource {
var pageViewController: UIPageViewController!
var pageTitles: [[String]]!
var pageImages: NSArray!
var complete : CGFloat = 0.0;
override func viewDidLoad(){
super.viewDidLoad()
HealthKit().recentSteps() { steps, error in
self.pageTitles = steps;
self.pageViewController = self
self.pageViewController.dataSource = self
let startVC = self.viewControllerAtIndex(0) as StepsDetailViewController
let viewControllers = NSArray(object: startVC)
dispatch_async(dispatch_get_main_queue(), {
self.pageViewController.setViewControllers(viewControllers as? [UIViewController], direction: .Forward, animated: true, completion: nil)
})
}
}
override func percentCompleteDidChange() {
if let percentComplete = self.percentComplete {
complete = percentComplete
let vc: StepsDetailViewController = self.storyboard?.instantiateViewControllerWithIdentifier("StepsDetailViewController") as! StepsDetailViewController
vc.updateProgressComplete(percentComplete, index: 0)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func viewControllerAtIndex(index: Int) -> StepsDetailViewController
{
if ((self.pageTitles.count == 0) || (index >= self.pageTitles.count)) {
return StepsDetailViewController()
}
let vc: StepsDetailViewController = self.storyboard?.instantiateViewControllerWithIdentifier("StepsDetailViewController") as! StepsDetailViewController
vc.titleText = self.pageTitles[index][0]
vc.stepData = self.pageTitles[index][1]
vc.pageIndex = index
return vc
}
// MARK: - Page View Controller Data Source
func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController?
{
let vc = viewController as! StepsDetailViewController
var index = vc.pageIndex as Int
if (index == 0 || index == NSNotFound)
{
return nil
}
index -= 1
return self.viewControllerAtIndex(index)
}
func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
let vc = viewController as! StepsDetailViewController
var index = vc.pageIndex as Int
if (index == NSNotFound){
return nil
}
index += 1
if (index == self.pageTitles.count)
{
return nil
}
return self.viewControllerAtIndex(index)
}
}