title: NSNumberFormatter display brackets on negative values
body: <p>I want the formatter to show -£4.00 as -£4.00 but it keeps displaying it as (£4.00), why is this ?</p>
  
  <p>This Function below turns strings "00000014" into "£00.14" it should turn negative values too. But the number formatter seems to add brackets. </p>
  
  <p>Code is below:</p>
  
  <pre><code>+(NSString *)pfsCurrencyAmountString:(NSString *)amount CurrencyCodeAsString:(NSString   *)code{
  
  if (amount == nil) {
      return nil;
  }
  
  int amountLength = [amount length];
  NSMutableString *amountMutable = [NSMutableString stringWithString:amount];
  
  if (amountLength &gt; 2) {
      [amountMutable insertString:@"." atIndex:amountLength - 2];
  }
  
  NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
  
  NSNumberFormatter *currencyStyle = [[NSNumberFormatter alloc] init];
  [currencyStyle setFormatterBehavior:NSNumberFormatterBehavior10_4];
  [currencyStyle setNumberStyle:@"NSNumberFormatterCurrencyStyle"];
  [currencyStyle setLocale:locale];
  [currencyStyle setCurrencyCode:code];
  
  NSNumber * balance = [currencyStyle numberFromString:amountMutable];
  [currencyStyle setNumberStyle:NSNumberFormatterCurrencyStyle];
  
  return [currencyStyle stringFromNumber:balance];
  }
  </code></pre>