How to reload Section in UICollection view - swift

Question

So i'm trying to implement a searchbar to search over different categories. After looking online a bit, I took a tutorial for UITableView and adapted it to my UICollectionView.
The searching works fine, as I am able to print the search results which go into the filteredCategories array.
Where I am having trouble is reloading the UICollectionView using the new filteredCategories array. I tried collectionView.reloadData() as well as collectionView.reloadSections(NSIndexSet(index: 1) as IndexSet) but with no success.
It seems as if the values are passed only once when the section is being built, and that I cannot change it.
Here is my code:
import UIKit
class ViewController: UIViewController {
var collectionView: UICollectionView!
let categories: [String] = ["Technology", "Science", "Entertainment", "Business", "Health", "Sports"]
var filteredCategories: [String] = ["none"]
var count = 0
var filteredCount = 6
var ready: [String] = ["none"]
var readyCount = 0
func filterIt() {
if isFiltering {
ready = filteredCategories
readyCount = filteredCategories.count
} else {
ready = categories
readyCount = categories.count
}
print("second", ready)
}
lazy var sections: [Section] = [
TitleSection(title: "NewsStand"),
// SearchSection(),
BasicGridSection(categories: ready, count: readyCount)
]
lazy var collectionViewLayout: UICollectionViewLayout = {
var sections = self.sections
let layout = UICollectionViewCompositionalLayout { (sectionIndex, environment) -> NSCollectionLayoutSection? in
return sections[sectionIndex].layoutSection()
}
return layout
}()
let searchController = UISearchController(searchResultsController: nil)
var isSearchBarEmpty: Bool {
return searchController.searchBar.text?.isEmpty ?? true
}
func filterContentForSearchText(_ searchText: String) {
filteredCategories = categories.filter { (category: String) -> Bool in
print("filtered", filteredCategories)
return category.lowercased().contains(searchText.lowercased())
}
filterIt()
collectionView.reloadData()
setupCollectionView()
collectionView.reloadSections(NSIndexSet(index: 1) as IndexSet)
}
var isFiltering: Bool {
return searchController.isActive && !isSearchBarEmpty
}
override func viewDidLoad() {
super.viewDidLoad()
self.title = "Compositional Layout"
self.view.backgroundColor = UIColor.white
self.title = "NewsStand"
setupCollectionView()
filterIt()
// 1
searchController.searchResultsUpdater = self
// 2
searchController.obscuresBackgroundDuringPresentation = false
// 3
searchController.searchBar.placeholder = "Search"
// 4
navigationItem.searchController = searchController
// 5
definesPresentationContext = true
}
func setupCollectionView() {
collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: collectionViewLayout)
collectionView.dataSource = self
collectionView.delegate = self
collectionView.backgroundColor = UIColor.white
collectionView.register(UINib(nibName: "TitleCell", bundle: .main), forCellWithReuseIdentifier: TitleCell.identifier)
collectionView.register(UINib(nibName: "GridCell", bundle: .main), forCellWithReuseIdentifier: GridCell.identifier)
collectionView.register(UINib(nibName: "SearchCell", bundle: .main), forCellWithReuseIdentifier: SearchCell.identifier)
self.view.addSubview(collectionView)
collectionView.reloadData()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
collectionView.reloadData()
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
collectionView.reloadData()
}
}
extension ViewController: UICollectionViewDataSource {
func numberOfSections(in collectionView: UICollectionView) -> Int {
sections.count
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
sections[section].numberOfItems
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
sections[indexPath.section].configureCell(collectionView: collectionView, indexPath: indexPath)
}
}
extension ViewController: UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
guard let articlesView = storyboard?.instantiateViewController(withIdentifier: "articleViewController") as? ArticleViewController else {
print("error")
return
}
// set the post id for the comments
articlesView.set(index: indexPath.item)
// present(articlesView, animated: true, completion: nil)
self.navigationController!.pushViewController(articlesView, animated: true)
}
}
extension ViewController: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
let searchBar = searchController.searchBar
filterContentForSearchText(searchBar.text!)
}
}
and Section:
struct BasicGridSection: Section {
// TODO: create a constant for the title of the header of type String
var categories: [String]
var numberOfItems: Int
// TODO: create an initializer to set the title
init(categories: [String], count: Int) {
self.categories = categories
self.numberOfItems = count
}
func layoutSection() -> NSCollectionLayoutSection? {
let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(0.1), heightDimension: .fractionalHeight(0.8))
let item = NSCollectionLayoutItem(layoutSize: itemSize)
let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .fractionalHeight(0.4))
let group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize, subitem: item, count: 2)
let section = NSCollectionLayoutSection(group: group)
return section
}
func configureCell(collectionView: UICollectionView, indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: String(describing: GridCell.self), for: indexPath) as? GridCell
cell!.set(label:categories[indexPath.row])
return cell!
}
}
Thanks!