custom cell 

import UIKit

class CustomCell1: UITableViewCell {
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func configure() {
        print("Cell got configured")
    }
}

View Controller ：

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    let cellId = "cell"

    override func viewDidLoad() {
        super.viewDidLoad()
        setupTableView()
    }

    func setupTableView() {
        let table = UITableView()
        table.delegate = self
        table.dataSource = self
        view.addSubview(table)
        table.register(CustomCell1.self, forCellReuseIdentifier: cellId)
        table.translatesAutoresizingMaskIntoConstraints = false
        table.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        table.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        table.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        table.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 4
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        return 4
    }

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        switch section {
        case 0:
            return "Value 1 Cell Style | Section: /(section) - "
        default:
            return "Default cell header title"
        }
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        var cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
        switch indexPath.section {
        case 0:
            cell = UITableViewCell.init(style: .value1, reuseIdentifier: cellId) as! CustomCell1
            cell.configure(...) // This method isn't working
            cell.textLabel?.text = "Title Label /(indexPath.row) - "
            cell.detailTextLabel?.text = "Detail label"
        default:
            cell = UITableViewCell.init(style: .default, reuseIdentifier: cellId)
            cell.textLabel?.text = "Title Label /(indexPath.row) - "
            cell.detailTextLabel?.text = "Detail Label"
        }

        return cell
    }
}

后来我用了这种方法解决了问题:

其实使用dequeueReusableCell不是正确的方法，

使用不同的cell identifier 

例如

let cell1Id = "cell1"        
let defaultCellId = "defaultCell"

table.register(CustomCell1.self, forCellReuseIdentifier: cell1Id)
table.register(UITableViewCell.self, forCellReuseIdentifier: defaultCellId)

让dequeueReusableCell函数来创建和重用cell：

  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    switch indexPath.section {
    case 0:
        let cell = tableView.dequeueReusableCell(withIdentifier: cell1Id, for: indexPath) as! CustomCell1
        cell.configure()
        cell.textLabel?.text = "Title Label /(indexPath.row) - "
        cell.detailTextLabel?.text = "Detail label"
        return cell
    default:
        let cell = tableView.dequeueReusableCell(withIdentifier: defaultCellId, for: indexPath)
        cell.textLabel?.text = "Title Label /(indexPath.row) - "
        cell.detailTextLabel?.text = "Detail Label"
        return cell
    }
}