subview scroll is not working SWIFT - ios

Question

Goal: to make a viewcontroller have multiple pages and can be swapped through a segmented controller, pages content are scrollable vertically
details:
I made a pagviewcontroller and embedded it as a subview to main viewcontroller
//add pageviewcontroller as subview to viewcontroller
if let vc = storyboard?.instantiateViewControllerWithIdentifier("ProfileEditController"){
self.addChildViewController(vc)
self.view.addSubview(vc.view)
EditTabs = vc as! UIPageViewController
EditTabs.dataSource = self
EditTabs.delegate = self
//define First page
EditTabs.setViewControllers([pagesAtIndexPath(0)!], direction:.Forward, animated: true, completion: nil)
EditTabs.didMoveToParentViewController(self)
//bring segmented view buttons to front of pageViews
self.view.bringSubviewToFront(self.topTabs)
}
I called pageViewController functions, and I am adding pages through restoration Identifiers
I managed segmented view controller by getting pageindex and setting viewcontroller like this:
EditTabs.setViewControllers([pagesAtIndexPath(0)!], direction:.Reverse, animated: true, completion: nil)
in story board the sub pages has scroll view inside to hold the content
I tested subpages scroll view by calling it through segue and its working fine
Case:
everything work fine Only scroll view of subpages are not working at all
How to solve this issue?
your guidelines will be much appreciated
Thanks,

Answer 1

I have created a view controller with PageViewController with three View Controllers that have scroll view in it. It works fine.
import UIKit
class ViewController: UIViewController, UIPageViewControllerDataSource {
var viewControllers : [UIViewController]?
override func viewDidLoad() {
super.viewDidLoad()
CreatePageView()
}
func CreatePageView() {
SetupViewControllers()
let pageViewController = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
pageViewController.dataSource = self
pageViewController.setViewControllers([(viewControllers?[0])!] , direction: .forward, animated: false, completion: nil)
pageViewController.view.frame = CGRect(x: 0, y: 0, width: view.frame.size.width, height: view.frame.size.height);
pageViewController.view.frame = CGRect(x: 0, y: 0, width: view.frame.size.width, height: view.frame.size.height);
addChildViewController(pageViewController)
view.addSubview(pageViewController.view)
pageViewController.didMove(toParentViewController: self)
pageViewController.view.backgroundColor = UIColor.blue
}
func SetupViewControllers() {
let firstVC = UIViewController()
firstVC.view.tag = 100
firstVC.view.backgroundColor = UIColor.red
AddScrollView(bgView: firstVC.view)
let secondVC = UIViewController()
secondVC.view.tag = 101
secondVC.view.backgroundColor = UIColor.brown
AddScrollView(bgView: secondVC.view)
let thirdVC = UIViewController()
thirdVC.view.tag = 102
thirdVC.view.backgroundColor = UIColor.purple
AddScrollView(bgView: thirdVC.view)
viewControllers = [firstVC,secondVC,thirdVC]
}
func AddScrollView(bgView: UIView) {
let scrollView = UIScrollView()
scrollView.frame = CGRect.init(x: 10, y: 10, width: bgView.frame.width-20, height: bgView.frame.height-20)
scrollView.backgroundColor = UIColor.init(red: 0.34, green: 0.45, blue: 0.35, alpha: 0.9)
bgView.addSubview(scrollView)
scrollView.contentSize = CGSize.init(width: scrollView.frame.size.width, height: scrollView.frame.size.height+200)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
if viewController.view.tag == 101 {
return viewControllers?[0]
}
else if viewController.view.tag == 102{
return viewControllers?[1]
}
else{
return viewControllers?[2]
}
}
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
if viewController.view.tag == 101 {
return viewControllers?[0]
}
else if viewController.view.tag == 102{
return viewControllers?[1]
}
else{
return viewControllers?[2]
}
}
func presentationCount(for pageViewController: UIPageViewController) -> Int {
return (viewControllers?.count)!
}
func presentationIndex(for pageViewController: UIPageViewController) -> Int {
return 0
}
}

Answer 2

Similar issues are raised fairly often on Stack. For my own issue in very similar circumstances, I too was able to use the scrollview without issue in it's own view, but when used as a subview in another subview, I needed to set the scrollview dimensions programatically.
Swift 2
scrollView.setFrame(CGRectMake(0, 0, DEVICE_WIDTH, DEVICE_HEIGHT))
or
Swift 3
scrollView.setFrame(CGRect(x: 0, y: 0, width: DEVICE_WIDTH, height: DEVICE_HEIGHT))
A further (and often viewed as a better) suggestion, automatically set the size based on contents.
var contentRect = CGRectZero
for view in self.scrollView.subviews {
contentRect = CGRectUnion(contentRect, view.frame)
}
self.scrollView.contentSize = contentRect.size
Hope this helps.