class TableViewReloadTestViewController: UIViewController {
	
	private lazy var tableView: UITableView = UITableView()
	
	override func viewDidLoad() {
		super.viewDidLoad()
		
		tableView.frame = view.frame
		view.addSubview(tableView)
		tableView.dataSource = self
		tableView.delegate = self
	}
	
}

extension TableViewReloadTestViewController: UITableViewDataSource, UITableViewDelegate {
	
	func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
		100
	}
	
	func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
		
		print("cellForItemAt \(indexPath)")

		let cell = UITableViewCell(style: .default, reuseIdentifier: nil)
		
		cell.textLabel?.text = "Row \(indexPath.row)"
		
		let redView = UIView()
		cell.contentView.addSubview(redView)
		redView.backgroundColor = .red.withAlphaComponent(0.1)
		redView.translatesAutoresizingMaskIntoConstraints = false
		cell.contentView.addConstraints([
			.init(item: redView, attribute: .left, relatedBy: .equal, toItem: cell.contentView, attribute: .left, multiplier: 1.0, constant: 8.0),
			.init(item: redView, attribute: .right, relatedBy: .equal, toItem: cell.contentView, attribute: .right, multiplier: 1.0, constant: -8.0),
			.init(item: redView, attribute: .top, relatedBy: .equal, toItem: cell.contentView, attribute: .top, multiplier: 1.0, constant: 8.0),
			.init(item: redView, attribute: .bottom, relatedBy: .equal, toItem: cell.contentView, attribute: .bottom, multiplier: 1.0, constant: -8.0)
		])
		let heightConstraint = NSLayoutConstraint(item: redView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 100.0)
		heightConstraint.priority = .defaultLow
		redView.addConstraint(heightConstraint)
		
		return cell
	}
	
	func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
		
		//let randomRow = (0..<tableView.numberOfRows(inSection: indexPath.section)).randomElement()!
		
		// let's reload the selected row (Visible row)
		let randomRow: Int = indexPath.row
		
		tableView.reloadRows(at: [IndexPath(row: randomRow, section: indexPath.section)], with: .automatic)
		
		print("Reloading at \(randomRow)")
	}
	
	func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
		// log the calls
		print("estimatedHeightForRowAt ", indexPath)
		return 10
	}
	
}