UUID and unique file names on iOS

NSString+UUID.h

@interface NSString(UUID)

+ (NSString *)stringWithUUID;

+ (NSString *)stringWithUniquePath;

@end

NSString+UUID.m

#import "NSString+UUID.h"

@implementation NSString(UUID)

+ (NSString *)stringWithUUID {

    CFUUIDRef theUUID = CFUUIDCreate(NULL);
    CFStringRef string = CFUUIDCreateString(NULL, theUUID);
    CFRelease(theUUID);
    return [(NSString *)string autorelease];
}

+ (NSString *)stringWithUniquePath {
    NSString *unique = [NSString stringWithUUID];
    return [NSTemporaryDirectory() stringByAppendingPathComponent: unique];
}

@end