objective-c file size formatter - objective-c

Question

Is there build in methods for formatting file sizes in Objective C? Or may be you could suggest me some library/source code/etc.?
What I mean is you have some file size that should be displayed something like this depending on given size:
1234 kb
1,2 mb
etc..
Thanks in advance

Answer 1

This one solves the problem quite elegantly:
[NSByteCountFormatter stringFromByteCount:countStyle:]
Example usage:
long long fileSize = 14378165;
NSString *displayFileSize = [NSByteCountFormatter stringFromByteCount:fileSize
countStyle:NSByteCountFormatterCountStyleFile];
NSLog(#"Display file size: %#", displayFileSize);
fileSize = 50291;
displayFileSize = [NSByteCountFormatter stringFromByteCount:fileSize
countStyle:NSByteCountFormatterCountStyleFile];
NSLog(#"Display file size: %#", displayFileSize);
Log output:
Display file size: 14.4 MB
Display file size: 50 KB
The output will be formatted properly according to the device's regional settings.
Available since iOS 6.0 and OS X 10.8.

Answer 2

Here's some code I found lying around. Not terribly efficient, and probably better attached to a category of NSNumberFormatter than NSNumber, and so on, but it seems to work
#interface NSNumber (FormatKibi)
- (NSString *)formatKibi;
#end
#implementation NSNumber (FormatKibi)
- (NSString *)formatKibi {
double value = [self doubleValue];
static const char suffixes[] = { 0, 'k', 'm', 'g', 't' };
int suffix = 0;
if (value <= 10000)
return [[NSString stringWithFormat:#"%5f", value]
substringToIndex:5];
while (value > 9999) {
value /= 1024.0;
++suffix;
if (suffix >= sizeof(suffixes)) return #"!!!!!";
}
return [[[NSString stringWithFormat:#"%4f", value]
substringToIndex:4]
stringByAppendingFormat:#"%c", suffixes[suffix]];
}
#end
I tested it with this:
int main(int argc, char *argv[]) {
for (int i = 1; i != argc; ++i) {
NSNumber *n = [NSNumber numberWithInteger:
[[NSString stringWithUTF8String:argv[i]]
integerValue]];
printf("%s ", [[n formatKibi] UTF8String]);
}
printf("\n");
return 0;
}
Then:
$ ./sizeformat 1 12 123 1234 12345 123456 1234567 12345678 1234567890 123456789012 12345678901234 1234567890123456 123456789012345678
1.000 12.00 123.0 1234. 12.0k 120.k 1205k 11.7m 1177m 114.g 11.2t 1122t !!!!!

Answer 3

Get the file size and then calculate whether it is in bytes or kb or mb
NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:URL error:&attributesError];
NSNumber *fileSizeNumber = [fileAttributes objectForKey:NSFileSize];
long long fileSize = [fileSizeNumber longLongValue];
Then conversion table
1 byte = 8 bits
1 KiB = 1,024 bytes
1 MiB = 1024 kb
1 GiB = 1024 mb
check this link