UITableViewCell with automatic height using autolayout

autoHeightTableViewCell.swift

/*
Ensure the cell has complete constraints from top to bottom, i.e all the subviews of the cell's contentView should have unambigous constraints from top to bottom.
*/

/* For UITableViews with Prototype cells */

// in viewDidLoad
self.tableView.rowHeight = UITableViewAutomaticDimension
self.tableView.estimatedRowHeight = 150 // an arbitrary number for estimation

/* For UITableViews with Static cells (Those typically created in IB) */

// in viewDidLoad
self.tableView.rowHeight = UITableViewAutomaticDimension
self.tableView.estimatedRowHeight = 150 // an arbitrary number for estimation

// in tableView delegate
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return UITableViewAutomaticDimension
}