NSMakeCollectable and ARC doesn't work

Question

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 *uui         


        

Answer 1

To have a single UUID across whole app, I think the best way to achieve that would be to have it run once in the whole application lifecycle.

static NSString *uuid;
- (NSString *)theCurrentDeviceUniqueIdentifier {

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        CFUUIDRef theUUID = CFUUIDCreate(kCFAllocatorDefault);
        if (theUUID) {
            uuid = CFBridgingRelease(CFUUIDCreateString(kCFAllocatorDefault, theUUID));
            CFRelease(theUUID);
        }
    });

    return uuid;
}