添加千分符

 对于理财，借款类APP来说，没有比千分位格式化来显示某些数据更有说明力了，最近刚好用到这个东西，就说一下吧。

• (NSString *)thousandSeparatWith:(NSString *)string{
  if (string.length<=0 || [string isEqualToString:@"(null)"]) {//判断值是否存在
  return @"0.00";
  }else if (string.floatValue < 1000) {//如果小于1000则不需要添加千分符
  return string;
  }else{
  NSString *integerString = @"";
  NSString *decimalString = @"00";
  if ([string rangeOfString:@"."].location != NSNotFound) {
  //带小数的情况下需要根据小数点切分，然后再添加千分符
  integerString = [[string componentsSeparatedByString:@"."] firstObject];
  decimalString = [[string componentsSeparatedByString:@"."] lastObject];
  }else{
  integerString = [[string componentsSeparatedByString:@"."] firstObject];
  }
  NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
  [numberFormatter setPositiveFormat:@",###"];
  NSString * lastString = [NSString stringWithFormat:@"%@.%@",[numberFormatter stringFromNumber:[NSNumber numberWithDouble:integerString.doubleValue]],decimalString];

  return lastString;
  

  }
  return @"";
  }