Question

I am trying to format a number, like this “123.123,00”. I am using an NSNumberFormatter.
The code is:

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setGroupingSize:3];
[numberFormatter setGroupingSeparator:@"."];
[numberFormatter setUsesGroupingSeparator:YES];
[numberFormatter setMaximumFractionDigits:12];

NSNumber *num = [NSNumber numberWithDouble:result];

NSString *formattedString = [numberFormatter stringFromNumber:num]; 

But it does not seem to work. It gives result like this “266.482107256796”. Any idea why the result is not “266.482,107,256,796”?

Answer 1

Grouping separator is used to separate digits in the integer part of a number and is not used in the fractional part. There’s no built-in way to achieve this effect. If you only support decimal numbers, you could manually parse the formatted string and insert a comma after each 3 characters, starting with the decimal separator.

NSMutableString *s = [NSMutableString stringWithString: formattedString];
NSUInteger decimalSeparatorLocation = [s rangeOfString: @"."].location;
if (decimalSeparatorLocation != NSNotFound) {
    for (NSUInteger i = decimalSeparatorLocation + 4; i + 1 < [s length]; i += 4)
        [s insertString: @"," atIndex: i];
}

Warning: this code is typed on an iPad (c).