Autoresizing content size of table view

CustomTableView.swift

class RelatedItemsTableView: UITableView, UITableViewDelegate, UITableViewDataSource {
    var items = [Items]() {
        didSet{
            self.reloadData()
        }
    }
    
    var headerTitles = [String]() {
        didSet {
            self.reloadSections(IndexSet.init(arrayLiteral: 0), with: .automatic)
        }
    }
    
    override var intrinsicContentSize: CGSize {
        self.layoutIfNeeded()
        return self.contentSize
    }

    override var contentSize: CGSize {
        didSet{
            self.invalidateIntrinsicContentSize()
        }
    }

    override func reloadData() {
        super.reloadData()
        self.invalidateIntrinsicContentSize()
    }
    
    weak var relatedItemsDelegate: RelatedItemCellDelegate?

    
    override init(frame: CGRect, style: UITableView.Style) {
        super.init(frame: frame, style: .plain)
        setupView()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
    
    private func setupView(){
        self.delegate = self
        self.dataSource = self
        self.isScrollEnabled = false
        self.register(UINib.init(nibName: "RelatedItemsCell", bundle: nil), forCellReuseIdentifier: "RelatedItemsCell")
        self.backgroundColor = .clear
        self.separatorStyle = .none
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return items.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "RelatedItemsCell", for: indexPath) as! RelatedItemsCell
        let item = items[indexPath.row]
        cell.itemImage.image = UIImage.init(named: item.imageName)
        cell.itemName.text = item.name
        cell.itemOriginalPrice.attributedText = item.originalPrice.strikeThrough()
        cell.itemDiscountedPrice.text = item.discountedPrice
        cell.itemQuantity.setTitle(item.quantity, for: .normal)
        cell.relatedDelegate = self
        cell.itemQuantity.tag = indexPath.row

        return cell
    }
    
    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let stackView = UIStackView()
        stackView.axis = .horizontal
        stackView.spacing = 10
        stackView.alignment = .fill
        stackView.distribution = .fillEqually
        stackView.layoutMargins = UIEdgeInsets(top: 0, left: 8, bottom: 0, right: 20)
        stackView.isLayoutMarginsRelativeArrangement = true
        
        for (index,text) in headerTitles.enumerated() {
            let label = UILabel()
            stackView.addArrangedAutolayoutSubview(label)
            apply(label) {
                $0.text = text
                if index == 0 {
                    $0.textColor = kDarkTextColor
                    $0.textAlignment = .left
                } else {
                    $0.textColor = kHeadingTitleTextColor
                    $0.textAlignment = .right
                }
                $0.font = UIFont(name: kMuliBold, size: 15)
            }
        }
        
        return stackView
    }
    
    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 50
    }
}

ViewController.swift

let relatedItems = RelatedItemsTableView()
relatedItems.relatedItemsDelegate = self
relatedItems.headerTitles = ["Related Items"]
relatedItems.items = [.init(imageName: "mangoes",
                            name: "Seasoned Mangoes",
                            quantity: "500g",
                            originalPrice: "Rs.180",
                            discountedPrice: "149"),
                      .init(imageName: "oil_masala",
                            name: "Oil & Masala",
                            quantity: "500g",
                            originalPrice: "Rs.180",
                            discountedPrice: "149"),
                      .init(imageName: "chicken",
                            name: "Chicken",
                            quantity: "500g",
                            originalPrice: "Rs.180",
                            discountedPrice: "149"),
                      .init(imageName: "pedegree",
                            name: "Pedigree",
                            quantity: "500g",
                            originalPrice: "Rs.180",
                            discountedPrice: "149")
]
scrollContentView.addAutolayoutSubview(relatedItems)

NSLayoutConstraint.activate([
    relatedItems.topAnchor.constraint(equalTo: detailsView.bottomAnchor, constant: 20),
    relatedItems.leadingAnchor.constraint(equalTo: scrollContentView.leadingAnchor, constant: 12),
    relatedItems.trailingAnchor.constraint(equalTo: scrollContentView.trailingAnchor, constant: -12),
    relatedItems.bottomAnchor.constraint(equalTo: scrollContentView.bottomAnchor, constant: -20),
])