gistfile1.m

- (id)valueForField:(NSString *)field
{
  if ([field isEqualToString:@"in_currency"]) {
    return [[_inCurrencyData objectAtIndex:[inCurrencyPicker selectedRowInComponent:0]] objectForKey:@"code"];
  } else if ([field isEqualToString:@"out_currency"]) {
    return [[_outCurrencyData objectAtIndex:[outCurrencyPicker selectedRowInComponent:0]] objectForKey:@"code"];
  } else if ([field isEqualToString:@"in_amount"]) {
    return [inAmount text];
  }
  return nil;
}