code: def field_at(index)
        data = self.class.instance_variable_get('@binding_data'.to_sym)
        data[index].tag = index + 1
        data[index]
      end
docs: +field_at+ retrieves the field at a given index.
  
   Usage:
  
       field = field_at(indexPath.row)
       label_view = subview(UILabel, :label_frame, text: field.label)