CODEWITHSUNDEEP
objective-cnsstring
RexOnRoids
RexOnRoids

Reputation: 14040

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

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?

Upvotes: 72

Views: 52661

Answers (9)

Albert Renshaw
Albert Renshaw

Reputation: 17882

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;\
})()\
)

Upvotes: 0

Sandip Patel - SM
Sandip Patel - SM

Reputation: 3394

For Swift 4.0

let formatter = NumberFormatter()

formatter.numberStyle = .decimal

formatter.minimumFractionDigits = 2

formatter.maximumFractionDigits = 2

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

Upvotes: 0

Julfikar
Julfikar

Reputation: 1423

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]]];

Upvotes: 0

Nazir
Nazir

Reputation: 1975

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]];

Upvotes: 16

Raj iOS
Raj iOS

Reputation: 1057

Swift version 

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

By http://ios.eezytutorials.com

Upvotes: 1

yujean
yujean

Reputation: 795

Even easier:

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

coworker just taught me this today. #amazing

Upvotes: 18

Nik
Nik

Reputation: 5921

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.

Upvotes: 149

Barry Wark
Barry Wark

Reputation: 107754

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.

Upvotes: 80

Phil Calvin
Phil Calvin

Reputation: 5105

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.

Upvotes: 34

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