数值处理

  NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
    numberFormatter.numberStyle=NSNumberFormatterDecimalStyle;
    numberFormatter.minimumFractionDigits=2;
    numberFormatter.maximumFractionDigits=6;
    [numberFormatter setFormatterBehavior:NSNumberFormatterBehaviorDefault];
    NSString *formattedNumberString = [numberFormatter stringFromNumber:[NSNumber numberWithDouble:122344.4563111]];
    NSLog(@"formattedNumberString: %@", formattedNumberString);