带编号的NSNumber

Question

Maybe this is a silly answer but I'm pretty new on ios.. I have to show a number in an specific way in my app. Currently, I have numbers that I receive from a service in an NSString. But, eg if I have a number: 123456789, i need to show it in a label as 123.456.789 .. anyone knows if there is some way to do that?

Edit: add ios and iphone tags

Answer 1

Use NSNumberFormatter :

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
NSString *formattedOutput = [formatter stringFromNumber:[attributesDict objectForKey:NSFileSystemFreeSize]];
NSLog(@"System free space: %@", formattedOutput);

If your number comes in as a string first, you'll need to make a number out of it first which you can do using NSString 's intValue method:

http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/intValue

Answer 2

[NSString localizedStringWithFormat:@"%@", myNumber];

Answer 3

This Worked for me:

NSNumberFormatter *numFormatter = [NSNumberFormatter new];
[numFormatter setLocale:[NSLocale localeWithLocaleIdentifier:@"fr_US"]];
[numFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
[numFormatter setUsesGroupingSeparator:YES];
[numFormatter setGroupingSeparator:@","];
[numFormatter setGroupingSize:3];
NSString * newString =  [numFormatter stringFromNumber:[NSNumber numberWithDouble:43423423423242]];