fetch & update UITableView cells from a collectionView cell click - ios

Question

Say, I have a ViewControllerA with a tableView, and that tableView has its header view created and loaded using xib method, and that headerView contains a .horizontal scroll direction collectionView, my question is how would I update the contents of my tableView on click initiated by the collectionView inside the headerView?
similar example is in the below picture:
say, I clicked the "Research" label on the UICollectionViewCell inside the Tableview's HeaderView and the tableView reloads data of "Research", and next I clicked the "Design" label, and the tableView reloads the itself and displays data for "Design".. something like that is possible? i am stuck here.. .

Answer 1

link the header UICollectionView to an outlet in the storyboard, then implement all the required delegate methods.
Add this delegate method:
class ViewController: UIViewController{
var categories = [String]()
var discoverData = [discoverModel]()
var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
}
}
extension ViewController: UICollectionViewDelegate, UICollectionViewDataSource{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
categories.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
//code to initialize cells of header collecionView
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let selectedCategory = categories[indexPath.row]
let cellToReload = discoverData.filter{return $0.serviceName == selectedCategory}[0]
guard let indexPathsOfCellToRealod = discoverData.firstIndex(of: cellToReload) else { return }
tableView.reloadRows(at: [IndexPath(index: indexPathsOfCellToRealod)], with: .automatic)
}
}
struct discoverModel: Equatable{
var image: UIImage
var serviceName: String
var name: String
var description: String
}
To make this work, just add the standard UITableView delegate methods to your ViewController