Use Autolayout to dynamically size UITableViewCells

gistfile1.m

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
  return [self heightForBasicCellAtIndexPath:indexPath];
}
 
- (CGFloat)heightForBasicCellAtIndexPath:(NSIndexPath *)indexPath {
  static RWBasicCell *sizingCell = nil;
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    sizingCell = [self.tableView dequeueReusableCellWithIdentifier:RWBasicCellIdentifier];
  });
 
  [self configureBasicCell:sizingCell atIndexPath:indexPath];
  return [self calculateHeightForConfiguredSizingCell:sizingCell];
}
 
- (CGFloat)calculateHeightForConfiguredSizingCell:(UITableViewCell *)sizingCell {
  [sizingCell setNeedsLayout];
  [sizingCell layoutIfNeeded];
 
  CGSize size = [sizingCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
  return size.height;
}