title: iPhone activity indicator being delayed?
body: <p>So when I click on a callout accessory in my mapView, nothing happens for several seconds because it is making a url request and parsing it, so I wanted to show the activity indicator so the user doesn't think it's frozen. Here's the code:</p>
  
  <pre><code>- (void)mapView:(MKMapView *)mv annotationView:(MKAnnotationView *)pin calloutAccessoryControlTapped:(UIControl *)control {
      // start activity indicator 
      [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
      NSLog(@"tapped");
  
      ArtPiece *artPiece = (ArtPiece *)pin.annotation;
  
      //when annotation is tapped switches page to the art description page
      artDescription *artD = [[artDescription alloc] initWithNibName:@"artDescription" bundle:nil];
      artD.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
      artD.startingLocation = mapView.userLocation.location.coordinate;
      artD.selectedArtPiece = artPiece;
      NSLog(@"0");
      [self presentModalViewController:artD animated:YES];
      NSLog(@"1");
  
      [artD loadArt:artPiece];
      NSLog(@"2");
      // stop activity indicator 
      //[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
  
      [artD release];
  }
  </code></pre>
  
  <p>Strangely (to me anyway, maybe I'm missing something obvious as I'm pretty inexperienced), the activity indicator does not show until after the method is done, and the modal view starts animating into view. I put the NSLogs in to see what was taking time. I had about a 2 second pause between "0" and "1" and another couple seconds between "1" and "2". Then the indicator finally showed, so I am sure it is waiting until the end of the method for some reason. Any ideas why?</p>