How to reload UIPageViewController to reload its views in Swift - ios

Question

I am using Page Controller embeded in Table VC. Table VC shows details of items and also contains collection view controller as embedded
one. So now when I select any Collection cell it should display the selected cell item details.
I am able to show everything for the new selected item but Page VC is not getting reloaded as per selected item images, it is still showing the last item images.
SO I'm stuck there. I am attaching the code for Page VC and Detail Table View
Please let me know the approach here to deal with it. Thanks in Advance.!!
//-----PAGE VC CODE------
import UIKit
import Firebase
protocol ProductImagesPageVCDelegate: class
{
func setupPageController(numberOfPages: Int)
func turnPageController(to index: Int)
}
class ProductImagesPageVC: UIPageViewController {
var product: Product!
weak var pageViewControllerDelegate: ProductImagesPageVCDelegate?
struct StoryBoard {
static let productImageVC = "ProductImageVC"
}
lazy var controllers: [UIViewController] = {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
var controllers = [UIViewController]()
if let imageLinks = self.product.imageLinks
{
for imageLink in imageLinks
{
let productImageVC = storyboard.instantiateViewController(withIdentifier: StoryBoard.productImageVC)
controllers.append(productImageVC)
}
}
self.pageViewControllerDelegate?.setupPageController(numberOfPages: controllers.count)
return controllers
}()
override func viewDidLoad() {
super.viewDidLoad()
// if #available(iOS 11.0, *) {
// contentInsetAdjustmentBehavior = .never
// } else {
// automaticallyAdjustsScrollViewInsets = false
// }
automaticallyAdjustsScrollViewInsets = false
dataSource = self
delegate = self
self.turnToPage(index: 0)
}
func turnToPage(index: Int)
{
let controller = controllers[index]
var direction = UIPageViewControllerNavigationDirection.forward
if let currentVC = viewControllers?.first
{
guard let currentIndex = controllers.index(of: currentVC) else {return}
if currentIndex > index
{
direction = .reverse
}
}
self.configuewDisplaying(viewController: controller)
setViewControllers([controller], direction: direction, animated: true, completion: nil)
}
func configuewDisplaying(viewController: UIViewController)
{
for (index, vc) in controllers.enumerated()
{
if viewController === vc {
if let productImageVC = viewController as? ProductImageVC
{
productImageVC.imageLink = self.product.imageLinks?[index]
self.pageViewControllerDelegate?.turnPageController(to: index)
}
}
}
}
}
extension ProductImagesPageVC: UIPageViewControllerDataSource
{
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
if let index = controllers.index(of: viewController)
{
if index < controllers.count - 1
{
return controllers[index + 1]
}
}
return controllers.first
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
if let index = controllers.index(of: viewController)
{
if index > 0
{
return controllers[index - 1]
}
}
return controllers.last
}
}
extension ProductImagesPageVC: UIPageViewControllerDelegate
{
func pageViewController(_ pageViewController: UIPageViewController, willTransitionTo pendingViewControllers: [UIViewController]) {
self.configuewDisplaying(viewController: pendingViewControllers.first as! ProductImageVC)
}
func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
if !completed
{
self.configuewDisplaying(viewController: previousViewControllers.first as! ProductImageVC)
}
}
}
//-----------Tabel VIEW Controllers-----
import UIKit
class ProductDetailTVC: UITableViewController {
#IBOutlet var productImagesHeaderView: ProductImagesHeaderView!
var product: Product!
var products: [Product]?
private var selectedProduct: Product?
struct Storyboard {
static let productDetailCell = "ProductDetailCell"
static let buyButtonCell = "BuyButtonCell"
static let showProductDetailCell = "ShowProductDetailCell"
static let suggestionTableCell = "SuggestionTableCell"
static let showImagesPageVC = "ShowProductImagesPageVC"
static let showProductDetail = "ShowProductDetail"
}
override func viewDidLoad() {
super.viewDidLoad()
title = product.name
fetchProducts()
tableView.estimatedRowHeight = tableView.rowHeight
tableView.rowHeight = UITableViewAutomaticDimension
}
func fetchProducts()
{
Product.fetchProducts { (products) in
self.products = products
if let index = self.products?.index(where: {$0 === self.product}) {
self.products?.remove(at: index)
}
self.tableView.reloadData()
}
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return 4
}
fileprivate func extractedFunc() -> UITableViewCell {
return UITableViewCell()
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0
{
let cell = tableView.dequeueReusableCell(withIdentifier: Storyboard.productDetailCell, for: indexPath) as! ProductDetailCell
cell.product = product
cell.selectionStyle = .none
return cell
} else if indexPath.row == 1
{
let cell = tableView.dequeueReusableCell(withIdentifier: Storyboard.buyButtonCell, for: indexPath) as! BuyButtonCell
cell.product = product
cell.selectionStyle = .none
return cell
} else if indexPath.row == 2
{
let cell = tableView.dequeueReusableCell(withIdentifier: Storyboard.showProductDetailCell, for: indexPath)
cell.selectionStyle = .none
return cell
}
else
{
let cell = tableView.dequeueReusableCell(withIdentifier: Storyboard.suggestionTableCell, for: indexPath) as! SuggestionTableCell
//cell.selectionStyle = .none
return cell
}
}
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
if indexPath.row == 3
{
return tableView.bounds.width + 68
}
else
{
return UITableViewAutomaticDimension
}
}
//Mark: - UITabeleViewDelegate
override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
if indexPath.row == 3
{
if let cell = cell as? SuggestionTableCell
{
cell.collectionView.delegate = self
cell.collectionView.dataSource = self
cell.collectionView.reloadData()
cell.collectionView.isScrollEnabled = false
}
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == Storyboard.showImagesPageVC
{
if let imagesPageVC = segue.destination as? ProductImagesPageVC
{
imagesPageVC.product = product
imagesPageVC.pageViewControllerDelegate = productImagesHeaderView
}
}
}
}
//MARK: - UICollectionViewDataSource
extension ProductDetailTVC : UICollectionViewDataSource
{
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 4
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "SuggestionCollectionViewCell", for: indexPath) as! SuggestionCollectionViewCell
guard let products = products else {return cell}
let randomProduct = Int(arc4random_uniform(UInt32(products.count)))
cell.product = products[randomProduct]
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
guard let selectedProduct = products?[indexPath.item] else {return}
self.selectedProduct = selectedProduct
self.product = selectedProduct
navigationItem.title = selectedProduct.name
self.tableView.reloadData()
collectionView.reloadData()
self.reloadInputViews()
}
}
//MARK: - UICollectionViewDelegate
extension ProductDetailTVC : UICollectionViewDelegate
{
}
//MARK: - UICOLLECTIONVIEWDELEGATEFLOWLAYOUT
extension ProductDetailTVC : UICollectionViewDelegateFlowLayout
{
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if let layout = collectionViewLayout as? UICollectionViewFlowLayout
{
layout.minimumLineSpacing = 5.0
layout.minimumInteritemSpacing = 2.5
let itemWidth = (collectionView.bounds.width - 5.0) / 2.0
return CGSize(width: itemWidth, height: itemWidth)
}
return CGSize.zero
}
}

Answer 1

I assume you want it to change when you update the product property?
You'll need to add a didSet to the property which updates the currently displayed view controller.