swift: How to create UIPageViewController? - ios

Question

I want to create UIPageViewController with spine mid location. I read several tutorials with UIPageViewController but in this tutorials used spine min or max location. And I can not create UIPageViewController with spine mid location.
I have this function to create UIPageViewController with spine mid location min or max location:
func createPageViewController() {
// Instantiate the PageViewController
let pageController = self.storyboard?.instantiateViewController(withIdentifier: "PageViewController") as! UIPageViewController
pageController.dataSource = self
pageController.delegate = self
if images.count > 0{
let contentController = getContentViewController(withIndex: 0)!
let contentControllers = [contentController]
pageController.setViewControllers(contentControllers, direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)
}
pageViewController = pageController
self.addChildViewController(pageViewController!)
self.view.addSubview(pageViewController!.view)
pageViewController!.didMove(toParentViewController: self)
}
I tried to change it for this:
let contentController = getContentViewController(withIndex: 0)!
let contentController1 = getContentViewController(withIndex: 1)!
let contentControllers = [contentController, contentController1]
But in this case my images not showing in pages. It is not help. What am I doing wrong? How to create UIPageViewController with spine mid location?
Update
import UIKit
class PageViewController: UIViewController {
#IBOutlet weak var PageControl: UIPageControl!
var pageViewController: UIPageViewController?
var images = ["book1page1.png","book1","book1","book1page2.png","book1page1.png","book1page2.png"]
var pendingIndex: Int?
override func viewDidLoad() {
super.viewDidLoad()
createPageViewController()
setupPageControll()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func createPageViewController() {
// Instantiate the PageViewController
let pageController = self.storyboard?.instantiateViewController(withIdentifier: "PageViewController") as! UIPageViewController
pageController.dataSource = self
pageController.delegate = self
if images.count > 0{
let firstController = getContentViewController(withIndex: 0)!
let contentControllers = [firstController]
pageController.setViewControllers(contentControllers, direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)
}
pageViewController = pageController
self.addChildViewController(pageViewController!)
//self.view.addSubview(pageViewController!.view)
self.view.insertSubview(pageViewController!.view, at: 0)
pageViewController!.didMove(toParentViewController: self)
}
//Setup Pagination Icons and count
func presentationCount(for pageViewController: UIPageViewController) -> Int {
return images.count
}
func presentationIndex(for pageViewController: UIPageViewController) -> Int {
return 0
}
func setupPageControll(){
let apperance = UIPageControl.appearance()
apperance.pageIndicatorTintColor = UIColor.gray
apperance.currentPageIndicatorTintColor = UIColor.white
apperance.backgroundColor = UIColor.clear
}
func currentControllerIndex() -> Int{
let pageItemController = self.currentConroller()
if let controller = pageItemController as? ContentViewController {
return controller.itemIndex
}
return -1
}
///////////////////////////////////////////////
func currentConroller() -> UIViewController?{
if (self.pageViewController?.viewControllers?.count)! > 0{
return self.pageViewController?.viewControllers![0]
}
return nil
}
func getContentViewController(withIndex index: Int) -> ContentViewController? {
if index < images.count{
let contentVC = self.storyboard?.instantiateViewController(withIdentifier: "ContentViewController") as! ContentViewController
contentVC.itemIndex = index
contentVC.imageName = images[index]
return contentVC
}
return nil
}
}
extension PageViewController: UIPageViewControllerDataSource, UIPageViewControllerDelegate {
func pageViewController(_ pageViewController: UIPageViewController, willTransitionTo pendingViewControllers: [UIViewController]) {
pendingIndex = (pendingViewControllers.first as! ContentViewController).itemIndex
}
func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
if completed {
let currentIndex = pendingIndex
if let index = currentIndex {
self.PageControl.currentPage = index
}
}
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
let contentVC = viewController as! ContentViewController
if contentVC.itemIndex > 0 {
return getContentViewController(withIndex: contentVC.itemIndex - 1)
}
return nil
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
let contentVC = viewController as! ContentViewController
if contentVC.itemIndex + 1 < images.count {
return getContentViewController(withIndex: contentVC.itemIndex + 1)
}
return nil
}
}

Answer 1

Select your PageViewController on story board and set. Spine Location none to Mid. Also Check double sided.
Modify your code as below. (Changes done on your own code)
import UIKit
class PageViewController: UIViewController {
#IBOutlet weak var PageControl: UIPageControl!
var pageViewController: UIPageViewController?
var images = ["01","02","03","04"]
var pendingIndex: Int?
override func viewDidLoad() {
super.viewDidLoad()
createPageViewController()
setupPageControll()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func createPageViewController() {
let pageController = self.storyboard?.instantiateViewController(withIdentifier: "PageViewController") as! UIPageViewController
pageController.isDoubleSided = true
pageController.dataSource = self
pageController.delegate = self
if images.count > 1{
let firstController = getContentViewController(withIndex: 0)!
let secondController = getContentViewController(withIndex: 1)!
let contentControllers = [firstController,secondController]
pageController.setViewControllers(contentControllers, direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)
}
pageViewController = pageController
self.addChildViewController(pageViewController!)
self.view.insertSubview(pageViewController!.view, at: 0)
pageViewController!.didMove(toParentViewController: self)
}
//Setup Pagination Icons and count
func presentationCount(for pageViewController: UIPageViewController) -> Int {
return images.count
}
func presentationIndex(for pageViewController: UIPageViewController) -> Int {
return 0
}
func setupPageControll(){
let apperance = UIPageControl.appearance()
apperance.pageIndicatorTintColor = UIColor.gray
apperance.currentPageIndicatorTintColor = UIColor.white
apperance.backgroundColor = UIColor.clear
}
func currentControllerIndex() -> Int{
let pageItemController = self.currentConroller()
if let controller = pageItemController as? ContentView {
return controller.itemIndex
}
return -1
}
///////////////////////////////////////////////
func currentConroller() -> UIViewController?{
if (self.pageViewController?.viewControllers?.count)! > 0{
return self.pageViewController?.viewControllers![0]
}
return nil
}
func getContentViewController(withIndex index: Int) -> ContentView? {
if index < images.count{
let contentVC = self.storyboard?.instantiateViewController(withIdentifier: "ContentViewController") as! ContentView
contentVC.itemIndex = index
//contentVC.imageName.image = self.images[index]
return contentVC
}
return nil
}
}
extension PageViewController: UIPageViewControllerDataSource, UIPageViewControllerDelegate {
func pageViewController(_ pageViewController: UIPageViewController, willTransitionTo pendingViewControllers: [UIViewController]) {
pendingIndex = (pendingViewControllers.first as! ContentView).itemIndex
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
let contentVC = viewController as! ContentView
if contentVC.itemIndex > 0 {
return getContentViewController(withIndex: contentVC.itemIndex - 1)
}
return nil
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
let contentVC = viewController as! ContentView
if contentVC.itemIndex + 1 < images.count {
return getContentViewController(withIndex: contentVC.itemIndex + 1)
}
return nil
}
}
Github Full Project.