UITableView inside UICollectionView -> [error] unexpectedly found nil while unwrapping tableView - ios

Question

I have a UITableView inside each cell of a UICollectionView.
I referenced the table view to a FeedCell class, which is a class for each cell in the collection view. However, I got an error saying
fatal error: unexpectedly found nil while unwrapping an Optional value
when trying to access the tableView object in the FeedCell class. I triple checked that I referenced the table view from the storyboard correctly, so I'm assuming there's something else that's causing it to be nil, but I'm not sure what it is. Does anyone have a clue about how to fix this?
This is my VC where both the collection view and the table view lies.
class HomeViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate,UICollectionViewDelegateFlowLayout, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var collectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
navigationController?.navigationBar.isTranslucent = false
collectionView.register(FeedCell.self, forCellWithReuseIdentifier: "FeedCell")
}
// for feedcell and its collection view
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return images.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "FeedCell", for: indexPath) as! FeedCell
cell.backgroundColor = backgrounds[indexPath.row]
return cell
}
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
guard let collectionViewCell = cell as? FeedCell else { return }
collectionViewCell.setTableViewDataSourceDelegate(dataSourceDelegate: self, forRow: indexPath.row)
}
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: view.frame.width, height: view.frame.height)
}
// conform to tableview protocol for hometable
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return images[tableView.tag].count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "HomeCell", for: indexPath)
cell.imageView?.image = images[tableView.tag][indexPath.item]
return cell
}
override func viewWillAppear(_ animated: Bool) {
self.navigationController?.setNavigationBarHidden(true, animated: animated)
super.viewWillAppear(animated)
}
override func viewWillDisappear(_ animated: Bool) {
self.navigationController?.setNavigationBarHidden(false, animated: animated)
super.viewWillDisappear(animated)
}
}
And here's a cell of the collection view where I reference the table view.
class FeedCell: BaseCollectionViewCell{
#IBOutlet weak var tableView: UITableView!
override func setupViews() {
super.setupViews()
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 4
}
}
extension FeedCell {
func setTableViewDataSourceDelegate
<D: UITableViewDataSource & UITableViewDelegate>
(dataSourceDelegate: D, forRow row: Int) {
# ERROR!
tableView.delegate = dataSourceDelegate
tableView.dataSource = dataSourceDelegate
tableView.tag = row
tableView.reloadData()
}
}

Answer 1

On this line:
(dataSourceDelegate: D, forRow row: Int)
You cast it as the variable: D
Use this instead:
tableView.dataSource = D
tableView.delegate = D