How to push view controller on a button tap in nested collection view cell swift

Question

I have a collection view inside a table view and a button in the collection view cell. I want to push another vc when that button is pressed.

I tried creating a delegate in the collection view cell, but the collection view cell has a cellforitem method in the table cell, so the delegate cannot be declared in the main view controller.

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    
    var tableView: UITableView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .black
        
        setUpTableView()
    }
    
    func setUpTableView() {
        let tableView = UITableView()
        
        view.addSubview(tableView)
        
        tableView.register(
            HomeRecommendStoreTableViewCell.self,
            forCellReuseIdentifier: HomeRecommendStoreTableViewCell.identifier
        )
        
        tableView.register(
            UITableViewCell.self,
            forCellReuseIdentifier: "cell"
        )
        
        tableView.delegate = self
        tableView.dataSource = self
        tableView.backgroundColor = .black
        
        tableView.showsVerticalScrollIndicator = false
        tableView.separatorStyle = .none
        tableView.contentInsetAdjustmentBehavior = .never
        
        self.tableView = tableView
        
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: HomePopularTableViewCell.identifier, for: indexPath) as? HomePopularTableViewCell else { return tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)}
        cell.selectionStyle = .none
        return cell
    }
}

class TableViewCell: UITableViewCell, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
    
    static let identifier = "HomeRecommendStoreTableViewCell"
    
    private var collectionView: UICollectionView!
    
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        contentView.backgroundColor = .black
        setUpCollectionView()
    }
    
    required init?(coder: NSCoder) {
        fatalError()
    }
    
    func setUpCollectionView() {
        let layout = UICollectionViewFlowLayout()
        
        let collectionView = UICollectionView(
            frame: .zero,
            collectionViewLayout: layout
        )
        
        layout.scrollDirection = .horizontal
        collectionView.register(
            HomeRecommendStoreCollectionViewCell.self,
            forCellWithReuseIdentifier: HomeRecommendStoreCollectionViewCell.identifier
        )
        collectionView.register(
            UICollectionViewCell.self,
            forCellWithReuseIdentifier: "cell"
        )
        
        collectionView.clipsToBounds = false
        collectionView.backgroundColor = .black
        collectionView.showsHorizontalScrollIndicator = false
        
        collectionView.delegate = self
        collectionView.dataSource = self
        
        contentView.addSubview(collectionView)
        
        collectionView.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(40)
            make.leading.equalToSuperview().offset(20)
            make.trailing.equalToSuperview()
            make.bottom.equalToSuperview().inset(80)
        }
        
        self.collectionView = collectionView
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 5
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        
        guard let cell = collectionView.dequeueReusableCell(
            withReuseIdentifier: HomeRecommendStoreCollectionViewCell.identifier, for: indexPath
        ) as? HomeRecommendStoreCollectionViewCell else {
            return collectionView.dequeueReusableCell(
                withReuseIdentifier: "cell", for: indexPath
            )
        }
        return cell
    }
}

class CollectionViewCell: UICollectionViewCell {
    static let identifier = "HomeRecommendStoreCollectionViewCell"
    
    private lazy var listButton: UIButton = {
        let button = UIButton()
        return button
    }()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setUp()
    }
    
    func setUp() {
        listButton.addTarget(self, action: #selector(onTap), for: .touchUpInside)
    }
    
    @objc func onTap() {
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

Answer 1

First you have to make a property in tableViewCell:

weak var parent:ViewController?

Then in viewController you have to use cell for row of tableView:

cell.parent = self

Then create same property in collectionViewCell:

weak var parent:ViewController?

And use collectionView func cell for item at:

cell.parent = parent

And use that parent inside your button func:

 @objc func onTap() {
    let destinationVC = NextViewController()
    parent?.navigationController.pushViewController(destinationVC,animated:true)
}