class MultilineLabelCell: UITableViewCell {
	let label = UILabel()
	
	override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
		super.init(style: style, reuseIdentifier: reuseIdentifier)
		commonInit()
	}
	required init?(coder: NSCoder) {
		super.init(coder: coder)
		commonInit()
	}
	private func commonInit() {
		label.translatesAutoresizingMaskIntoConstraints = false
		contentView.addSubview(label)
		let g = contentView.layoutMarginsGuide
		NSLayoutConstraint.activate([
			label.topAnchor.constraint(equalTo: g.topAnchor),
			label.leadingAnchor.constraint(equalTo: g.leadingAnchor),
			label.trailingAnchor.constraint(equalTo: g.trailingAnchor),
			label.bottomAnchor.constraint(equalTo: g.bottomAnchor),
		])
		label.numberOfLines = 0
		// so we can see the framing
		label.backgroundColor = .yellow
	}
	
}

class ReloadRowsTestVC: UIViewController, UITableViewDelegate, UITableViewDataSource {
	
	var myData: [String] = []
	var reloadCount: Int = 0
	
	let tableView = UITableView()
	
	override func viewDidLoad() {
		super.viewDidLoad()
		
		// some sample data
		for i in 1..<50 {
			let nLines = i % 4
			var s: String = "Row: \(i-1)\nLine 1"
			for n in 0..<nLines {
				s += "\nLine \(n+2)"
			}
			myData.append(s)
		}
		myData[4] += "\nReload Count: 0"

		var cfg = UIButton.Configuration.filled()
		cfg.title = "Reload row 4"

		let btn = UIButton(configuration: cfg, primaryAction: UIAction() { _ in
			self.reloadCount += 1
			self.myData[4] += "\nRow 4 - Reload Count: \(self.reloadCount)"
			print("Reload Count:", self.reloadCount)
			self.tableView.reloadRows(at: [IndexPath(row: 4, section: 0)], with: .none)
		})

		btn.translatesAutoresizingMaskIntoConstraints = false
		view.addSubview(btn)
		
		tableView.translatesAutoresizingMaskIntoConstraints = false
		view.addSubview(tableView)
		
		let g = view.safeAreaLayoutGuide
		NSLayoutConstraint.activate([
			
			btn.topAnchor.constraint(equalTo: g.topAnchor, constant: 20.0),
			btn.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 40.0),
			btn.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -40.0),
			
			tableView.topAnchor.constraint(equalTo: btn.bottomAnchor, constant: 20.0),
			tableView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 20.0),
			tableView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -20.0),
			tableView.bottomAnchor.constraint(equalTo: g.bottomAnchor, constant: -20.0),
			
		])
		
		tableView.register(MultilineLabelCell.self, forCellReuseIdentifier: "c")
		tableView.dataSource = self
		tableView.delegate = self

	}
	
	func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
		return myData.count
	}
	func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
		print("cellForRowAt:", indexPath)
		let c = tableView.dequeueReusableCell(withIdentifier: "c", for: indexPath) as! MultilineLabelCell
		c.label.text = myData[indexPath.row]
		return c
	}
	
}