Even when using AutoLayout and UITableView.automaticDimension, it's not obvious how to make your table view resize a cell when its content changes without reloading the entire cell. I've had success with calling beginUpdates() and endUpdates() on the table view after the content changes. This gist simply extracts that into a delegate.

ResizingTableViewCellDelegate.swift

/*
This code demonstrates a way to get UITableViewCells to resize
after their content size has changed, without needing to reload
the cells.

Prerequisites:
- The table view must be set up to calculate its cell heights dynamically; i.e.
  tableView.rowHeight = UITableView.automaticDimension
  tableView.estimatedRowHeight = 100 // or some good estimate
- The cell must be laid out using auto layout. Remember to add the subviews to 
  the cell's contentView.
*/



protocol ResizingTableViewCellDelegate: class {
  func resizeTableViewCells()
}

extension UITableView: ResizingTableViewCellDelegate {
  func resizeTableViewCells() {
    self.beginUpdates()
    self.endUpdates()
  }
}

// How to use:

class MyTableViewCell: UITableViewCell {
  // In your tableView(:cellForRowAt:), after the cell
  // is dequeued, do `cell.delegate = tableView`
  weak var delegate: ResizingTableViewCellDelegate
  
  // Add your subviews and dynamic layout here...
  
  // Call this when the cell content or size changes.
  private func resize() {
    // Animate the layout change:
    UIView.animateWithDuration(0.3) {
     cell.contentView.layoutIfNeeded()
    }
    
    // Ask the delegate (i.e. the tableview) to resize the cell:
    self.delegate?.resizeTableViewCells()
  }
}