ios - 四舍五入字符串

/**
四舍五入字符串

@param round 小数位 eg: 2
@param numberString 数字 eg 0.125
@return 四舍五入之后的 eg: 0.13
*/

• (double )roundNumberStringWithRound:(NSInteger)round numberString:(NSString *)numberString{

  if (numberString == nil) {
  return 0;
  }
  NSDecimalNumberHandler *roundingBehavior = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain scale:round raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:NO];
  NSDecimalNumber *aDN = [[NSDecimalNumber alloc] initWithString:numberString];
  NSDecimalNumber *resultDN = [aDN decimalNumberByRoundingAccordingToBehavior:roundingBehavior];
  return resultDN.doubleValue;
  }