I'm trying to convert my old project to ARC. I have a function which creates UUIDs, but apparently this is no longer supported when using ARC:

```
NSString *uuid = nil;
    CFUUIDRef theUUID = CFUUIDCreate(kCFAllocatorDefault);
    if (theUUID) {
        uuid = NSMakeCollectable(CFUUIDCreateString(kCFAllocatorDefault, theUUID));
        //[uuid autorelease];
        CFRelease(theUUID);
    }

```

I get the compiler error (when trying to convert): 'NSMakeCollectable' is unavailable: not available in automatic reference counting mode.

So my question is: how do I create UUIDs when using ARC? Is there another way which I should now use?