This code fixes layout issues with UITableViews that contain cells dynamically sizing labels in them (when using UITableViewAutomaticDimension).

TableViewAutoDimCellHeightFix

  // To be placed in your UITableViewDelegate.
  //
  // This is doing what autolayout *should* be doing which using the constraints to determine cell
  // height as needed. Currently, even with correctly setting prefferedMaxLayoutWidth on
  // labels within cells, heights calculated correctly at all times.
  // If you use this you MUST call dequeueReusableCellWithIdentifier, NOT
  // dequeueReusableCellWithIdentifier:atIndexPath in your cellForRow:atIndexPath method.
  // Otherwise you will crash. Again - this is a HACK and not good iOS dev.
  func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    let contentView: UIView = tableView.dataSource!.tableView(tableView, cellForRowAtIndexPath: indexPath)
    contentView.updateConstraintsIfNeeded()
    contentView.layoutIfNeeded()
    return contentView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize).height
  }
  
  // To be placed in each cell containing labels with dynamic height
  override func layoutSubviews() {
        super.layoutSubviews()
        // Assuming 2 labels with dynamic height in my cell: myLabelA and myLabelB
        myLabelA.preferredMaxLayoutWidth = myLabelA.bounds.width
        myLabelB.preferredMaxLayoutWidth = myLabelB.bounds.width
    }