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class BkgTableVC: UITableViewController {
    
    let bkgView = TVBkgView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.backgroundColor = .white
        
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "c")
        
        tableView.contentInset = UIEdgeInsets(top: 200, left: 0, bottom: 0, right: 0)
        
        tableView.backgroundView = bkgView
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 30
    }
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let c = tableView.dequeueReusableCell(withIdentifier: "c", for: indexPath)
        c.textLabel?.text = "\(indexPath)"
        return c
    }
    
}
 
class TVBkgView: UIView, UICollectionViewDataSource, UICollectionViewDelegate {
    
    let titleLabel: UILabel = {
        let v = UILabel()
        v.backgroundColor = .brown
        v.textColor = .yellow
        v.textAlignment = .center
        return v
    }()
    
    let infoLabel: UILabel = {
        let v = UILabel()
        v.backgroundColor = .brown
        v.textColor = .yellow
        v.textAlignment = .center
        return v
    }()
 
    var cView: UICollectionView!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        commonInit()
    }
    func commonInit() -> Void {
        backgroundColor = .orange
        
        let fl = UICollectionViewFlowLayout()
        fl.scrollDirection = .horizontal
        fl.itemSize = CGSize(width: 160, height: 80)
        
        cView = UICollectionView(frame: .zero, collectionViewLayout: fl)
        
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
        cView.translatesAutoresizingMaskIntoConstraints = false
        infoLabel.translatesAutoresizingMaskIntoConstraints = false
        
        addSubview(titleLabel)
        addSubview(cView)
        addSubview(infoLabel)
 
        NSLayoutConstraint.activate([
            
            titleLabel.topAnchor.constraint(equalTo: topAnchor, constant: 44.0),
            titleLabel.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 20.0),
            titleLabel.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -20.0),
            titleLabel.heightAnchor.constraint(equalToConstant: 28.0),
 
            cView.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 8.0),
            cView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 0.0),
            cView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: 0.0),
            cView.heightAnchor.constraint(equalToConstant: 88.0),
            
            infoLabel.topAnchor.constraint(equalTo: cView.bottomAnchor, constant: 8.0),
            infoLabel.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 20.0),
            infoLabel.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -20.0),
            infoLabel.heightAnchor.constraint(equalTo: titleLabel.heightAnchor),
            
        ])
        
        titleLabel.text = "Background View"
        infoLabel.text = "Info"
        
        cView.dataSource = self
        cView.delegate = self
        cView.register(TVBkgCell.self, forCellWithReuseIdentifier: "c")
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 30
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let c = collectionView.dequeueReusableCell(withReuseIdentifier: "c", for: indexPath) as! TVBkgCell
        c.label.text = "\(indexPath.item)"
        c.button.setTitle("Button \(indexPath.item)", for: [])
        c.callBack = { [weak self] str in
            guard let self = self else { return }
            self.infoLabel.text = "Tapped: \(str)"
        }
        return c
    }
 
}
 
class TVBkgCell: UICollectionViewCell {
    
    var callBack: ((String) -> ())?
    
    let label: UILabel = {
        let v = UILabel()
        v.backgroundColor = .yellow
        v.textAlignment = .center
        return v
    }()
    
    let button: UIButton = {
        let v = UIButton()
        v.backgroundColor = .red
        v.setTitleColor(.white, for: .normal)
        v.setTitleColor(.lightGray, for: .highlighted)
        return v
    }()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        commonInit()
    }
    func commonInit() -> Void {
        contentView.backgroundColor = .systemBlue
        
        label.translatesAutoresizingMaskIntoConstraints = false
        button.translatesAutoresizingMaskIntoConstraints = false
        contentView.addSubview(label)
        contentView.addSubview(button)
        let g = contentView.layoutMarginsGuide
        NSLayoutConstraint.activate([
            
            label.topAnchor.constraint(equalTo: g.topAnchor),
            label.leadingAnchor.constraint(equalTo: g.leadingAnchor),
            label.trailingAnchor.constraint(equalTo: g.trailingAnchor),
            
            button.topAnchor.constraint(greaterThanOrEqualTo: label.bottomAnchor, constant: 8.0),
            button.leadingAnchor.constraint(equalTo: g.leadingAnchor),
            button.trailingAnchor.constraint(equalTo: g.trailingAnchor),
            button.bottomAnchor.constraint(equalTo: g.bottomAnchor),
            
        ])
        
        button.addTarget(self, action: #selector(btnTap(_:)), for: .touchUpInside)
    }
    
    @objc func btnTap(_ sender: UIButton) {
        if let t = sender.currentTitle {
            callBack?(t)
        }
    }
    
}