This sample project shows how to animate UITableView row height changes. The magic happens in ViewController.cellHeightDidChange.

• The contents of the UITableViewCells should have constraints tying them to the cell's top and bottom.
• Internally UITableView measures the intrinsic height of each cell, then assigns it a required (priority = 1000) height constraint. To avoid conflict warnings in UIB, avoid required (priority = 1000) static height constraints on the contents of table cells.
• When a cell has a good idea that its intrinsic height changed, it should call heightChangedClosure.