I have a tableView to feature searches. The second row (indexPath.row = 1) has a UICollectionView inside to display elements horizontally.

As these UICollectionView cells will be users, I want to detect clicks on them, which I cannot achieve. I guess there might be something I don't cover since the collectionView is inside a row of a UITableView. I attach an image where the red squares are the collectionView cells inside a row of a table.

Inside my tableView I have:

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    
    if indexPath.section == 0 {
        if indexPath.row == 0 {
            let cell = tableView.dequeueReusableCell(withIdentifier: reuseIdentifier, for: indexPath) as! RecentUserCell
            return cell
        } else {
            let cell = tableView.dequeueReusableCell(withIdentifier: recentTextReuseIdentifier, for: indexPath) as! RecentTextCell
            cell.viewModel = RecentTextCellViewModel(recentText: recentSearchedText[indexPath.row - 1])
            cell.selectionStyle = .none
            return cell
        }
    } else {
        let cell = tableView.dequeueReusableCell(withIdentifier: reuseIdentifier, for: indexPath) as! RecentUserCell
        return cell
    }
}

And the RecentUserCell, has a collectionView inside. The last method, didSelectItemAt, is not getting called, which means I cannot access to a particular user

private let identifier = "collectionCell"

class RecentUserCell: UITableViewCell {
    
    //MARK: - Properties
    private var users = [User]()
        
    public let collectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .horizontal
        let collectionView = UICollectionView(frame: CGRect(), collectionViewLayout: layout)
        return collectionView
    }()
    
    //MARK: - Lifecycle
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        fetchUsers()
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.isUserInteractionEnabled = true
        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: identifier)
        collectionView.showsHorizontalScrollIndicator = false
        addSubview(collectionView)
        collectionView.anchor(top: topAnchor, left: leftAnchor, bottom: bottomAnchor, right: rightAnchor)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    //MARK: - API
    func fetchUsers() {
        UserService.fetchUsers { users in
            self.users = users
            self.collectionView.reloadData()
        }
    }
}

//MARK: - UICollectionViewDataSource

extension RecentUserCell: UICollectionViewDataSource {
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return users.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: identifier, for: indexPath) //as! UserCollectionViewCell
        //cell.delegate = self
        cell.backgroundColor = .red
        //cell.viewModel = UserCellViewModel(user: users[indexPath.row])
        return cell
    }
}

//MARK: - UICollectionViewDelegateFlowLayout

extension RecentUserCell: UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: 70, height: 80)
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        print("Selected item at \(indexPath.row)")
    }
}

Anyone has an idea of how I can get this method called or what strategy I could use to detect clicks on this UICollectionViewCells?

CodePudding user response：

Your issue is related to adding subviews directly to UITableViewCell and not using contentView. You can read more about UITableViewCell internals here