Slow UI update, add Spinner

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I've created an iPad App which internally load a large amount of media, which can freeze the UI for a few seconds (especially on older iPads). I'm exploring async and adding a spinner, but it I haven't been able to identify the right spot for spinner to start prior to new ViewController opening. Any help is appreaciated.

 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

[activityIndicatorObject startAnimating];

dispatch_queue_t downloadQueue = dispatch_queue_create("downloader", NULL);
dispatch_async(downloadQueue, ^{

    understandingViewController *destViewController = segue.destinationViewController;
    destViewController.itemNumber = num1;
    destViewController.selectedItem = num1;

    dispatch_async(dispatch_get_main_queue(), ^{
        [activityIndicatorObject stopAnimating];
    });

});

}

asked 25 secs ago

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