how do you refresh ABUnknownPersonViewController?

Question

My problem: I have a ABUnknownPersonViewController which needs to get an image from an online database. I have implemented an NSSession to download the image. The thread adds the image to the ABRecordRef then adds it to the ABUnknownPersonViewController. When the controller is pushed on the stack, it doesn't show the image...therfore sadness ensues.

NSString *imageUrl = dict[@"mug"];
__block NSURL  *url = [NSURL URLWithString:imageUrl];
__block NSData *urlData = nil;

NSURLSessionConfiguration *sessionConfig =
[NSURLSessionConfiguration defaultSessionConfiguration];


NSURLSession *session =
[NSURLSession sessionWithConfiguration:sessionConfig
                              delegate:self
                         delegateQueue:nil];
NSURLSessionDownloadTask *getImageTask =
[session downloadTaskWithURL:[NSURL URLWithString:imageUrl]

           completionHandler:^(NSURL *location,
                               NSURLResponse *response,
                               NSError *error) {

               urlData = [NSData dataWithContentsOfURL:url];

               dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                   newPerson = controller.displayedPerson;
                   ABPersonSetImageData(newPerson, (__bridge CFDataRef)(urlData), &anError);
                   controller.displayedPerson = newPerson;
                   if(urlData != nil) {
                       NSLog(@"I got here");
                       [self viewWillAppear:YES];
                       [[NSNotificationCenter defaultCenter] postNotificationName:@"com.razeware.imagegrabber.imageupdated" object:(__bridge id)(newPerson)];

                   }
               });
           }];
[getImageTask resume];

**Oddly enough, if I choose "Create New Contact" the image appears (So, the thread is working?). If I click cancel on iPhone then the image appears on the ABUnknownPersonViewController. So, it seems like the controller just needs to be refreshed. How?
I've tried [[self view] setNeedsDisplay]; //ain't working'

Help please!

Answer 1

I found a solution: ABRecordRef cannot be updated in a thread. It must be updated on the main thread.