How to add commas to number every 3 digits in Objective C?

Question

If I have a number int aNum = 2000000 how do I format this so that I can display it as the NSString 2,000,000?

score 149 · Answer 1 · edited Jun 26 '13 at 07:26

149

Use NSNumberFormatter.

Specifically:

NSNumberFormatter *formatter = [NSNumberFormatter new];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle]; // this line is important!

NSString *formatted = [formatter stringFromNumber:[NSNumber numberWithInteger:2000000]];

[formatter release];

By default NSNumberFormatter uses the current locale so the grouping separators are set to their correct values by default. The key thing is to remember to set a number style.

edited Jun 26 '13 at 07:26

Girish

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answered Dec 14 '11 at 06:13

Nik

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yes I had similar problem it wouldnt parse "200,000", even if I had set the locale to English UK, until I had set the style to NSNumberFormatterDecimalStyle. Think it would only understand the string "200000" – brian.clear Dec 04 '12 at 09:20
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@MCKapur why do you say new is old school? It does not make sense typing more to do the same, isn't it? – Julio Bailon Aug 20 '14 at 13:27
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@JulioBailon WOW this was like 2 years ago. Honestly don't remember why I said +new was old school. It isn't. I do however prefer +alloc-init for consistency, +new always felt like an unnecessary shortcut, and +alloc-init helped me keep good code practice. – MCKapur Aug 20 '14 at 14:44
What if I want both commas and the decimal places? – GeneCode Aug 26 '16 at 11:17

Barry Wark · Accepted Answer · 2013-01-25T02:58:34.083

80

Don't do your own number formatting. You will almost certainly not get all the edge cases right or correctly handle all possible locales. Use the NSNumberFormatter for formatting numeric data to a localized string representation.

You would use the NSNumberFormatter instance method -setGroupingSeparator: to set the grouping separator to @"," (or better yet [[NSLocale currentLocale] objectForKey:NSLocaleGroupingSeparator]; thanks @ntesler) and -setGroupingSize: to put a grouping separator every 3 digits.

edited Jan 25 '13 at 02:58

answered Feb 10 '10 at 01:39

Barry Wark

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Cool, am I all set after I -setGroupingSize: ? Or do I need to -setFormat: ? – RexOnRoids Feb 10 '10 at 01:47
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Better off localizing it with `[formatter setGroupingSeparator: [[NSLocale currentLocale] objectForKey:NSLocaleGroupingSeparator]];` – nathan Dec 11 '11 at 06:08
NSNumberformatter is not good enough, especially if you need to be prepared for international formats. – brainray Aug 28 '13 at 21:43
NSNumberFormatter doesn't handle NSDecimalNumber well enough. It loses precision. – Big Money Apr 26 '16 at 22:20
What could be proper solution if i want dot(.) instead of comma(,) ? – Birju Aug 21 '16 at 10:01

score 34 · Answer 3 · answered Sep 04 '12 at 17:51

There's a static method on NSNumberFormatter that does just what you need:

int aNum = 2000000;
NSString *display = [NSNumberFormatter localizedStringFromNumber:@(aNum)
                                                     numberStyle:NSNumberFormatterDecimalStyle];

This way is a little more succinct than creating a new NSNumberFormatter if you don't need to do any additional configuration of the formatter.

score 18 · Answer 4 · answered Jan 06 '15 at 19:03

18

Even easier:

NSNumber *someNumber = @(1234567890);
NSString *modelNumberString = [NSString localizedStringWithFormat:@"%@", someNumber];
NSLog(@"Number with commas: %@", modelNumberString);

coworker just taught me this today. #amazing

answered Jan 06 '15 at 19:03

yujean

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localizedStringWithFormat depends on your current locale and for different languages produces different separators. – Aliaksandr Bialiauski May 27 '16 at 05:40

Nazir · Answer 5 · 2016-08-23T09:41:29.117

Think some as i will get this post looking for sample. So if you are working with number make attention on next params:

setNumberStyle:NSNumberFormatterCurrencyStyle // if you are working with currency

It could be also

setNumberStyle:NSNumberFormatterDecimalStyle

All code is For ARC.

If you are working with Integer and need to get result such as 200,000

int value = 200000;
NSNumberFormatter * formatter = [NSNumberFormatter new];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
NSString * newString =  [formatter stringFromNumber:[NSNumber numberWithInteger:value]];

If you are working with Float and need to get result such as 200,000.00

float value = 200000;
NSNumberFormatter * formatter = [NSNumberFormatter new];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[formatter setMaximumFractionDigits:2]; // Set this if you need 2 digits
NSString * newString =  [formatter stringFromNumber:[NSNumber numberWithFloat:value]];

EDIT

To have ability to use different digital separators use NSLocale. Add to code where NSLocale is specified on Locale Identifier:

[formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"de_DE"]];

or use current local:

[formatter setLocale:[NSLocale currentLocale]];

simple way us to use `NSLocale` just add `[formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"de_DE"]];` to use different separator, depends on local digital style — Nazir, Aug 23 '16 at 09:33
How to display 5,234.00... i need to display 2 decimal numbers — Yalamandarao, Mar 02 '18 at 06:47
@Singapore use `setMaximumFractionDigits` to set up number digits you need — Nazir, Mar 06 '18 at 05:53

score 1 · Answer 6 · answered Nov 24 '15 at 10:09

1

Swift version

let formatter = NSNumberFormatter()
formatter.numberStyle = .DecimalStyle
formatter.maximumFractionDigits = decimalPlaces
let result = formatter.stringFromNumber(NSNumber(double: 8.0))

By http://ios.eezytutorials.com

answered Nov 24 '15 at 10:09

Raj iOS

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score 0 · Answer 7 · answered Aug 29 '17 at 03:23

An easy solution could be this. My answer is almost same like @Nazir's answer but with a small trick.

double current_balance = 2000000.00;

NSNumberFormatter * formatter = [NSNumberFormatter new];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
//[formatter setNumberStyle:NSNumberFormatterCurrencyStyle];  //if you want for currency with $ sign
[formatter setMinimumFractionDigits:2]; // Set this if you need 2 digits
[formatter setMaximumFractionDigits:2]; // Set this if you need 2 digits
NSString * currency_format =  [NSString stringWithFormat:@"%@", [formatter stringFromNumber:[NSNumber numberWithDouble:current_balance]]];

Sandip Patel - SM · Answer 8 · 2018-09-13T12:41:33.810

0

For Swift 4.0

let formatter = NumberFormatter()

formatter.numberStyle = .decimal

formatter.minimumFractionDigits = 2

formatter.maximumFractionDigits = 2

let result = formatter.string(from: NSNumber(value: 123456))

edited Sep 13 '18 at 12:41

answered Sep 13 '18 at 11:54

Sandip Patel - SM

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score 0 · Answer 9 · answered May 31 '20 at 06:42

For those who need to do it with strings of numbers and not just integers (I.e. Big Numbers) I made the following macro:

#define addCommas(__string) (\
(^NSString *(void){\
NSString *__numberString = __string;\
NSString *__integerPortion = __numberString;\
NSString *__decimalPortion = @"";\
if ([__string containsString:@"."]) {\
__integerPortion = [__numberString componentsSeparatedByString:@"."][0];\
__decimalPortion = st(@".%@", [__numberString componentsSeparatedByString:@"."][1]);\
}\
int __i = (int)__integerPortion.length-3;\
while (__i > 0) {\
__integerPortion = st(@"%@,%@", substringInRange(__integerPortion, 0, __i), substringInRange(__integerPortion, __i, (int)__integerPortion.length));\
__i -= 3;\
}\
__numberString = st(@"%@%@", __integerPortion, __decimalPortion);\
return __numberString;\
})()\
)

How to add commas to number every 3 digits in Objective C?

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