Pushing and Popping View Controllers - iphone

Question

I have a navigation view controller which is a table view and then from the table view if i select a row it goes into detail view page. When i go to the detail view page i retrieve some information from the server and if the server does not respond then i get an alert view pop up which appears in front of my parent navigation view. now when press ok on the alert view and click on another row and it does go into my "didselectview" method but does not go to my detail view page. Would anyone know why? Code given below.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
//Navigation logic may go here. Create and push another view controller.
Item *selectedItem = (Item *)[self.fetchedObjectsArray objectAtIndex:indexPath.row];
NSString * urlString = [CONST_FEED_DISCRIPTION_URL stringByAppendingString:selectedItem.guid];
NSDate * dateString = selectedItem.date;
JsonViewController *jsonViewController = [[JsonViewController alloc] initWithURLString:urlString date:dateString];
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:#"Back"
style:UIBarButtonItemStyleBordered
target:nil
action:nil];
self.navigationItem.backBarButtonItem = backButton;
self.navigationController.navigationBar.tintColor = [UIColor colorWithHexString:CONST_NAVIGATIONBAR_COLOR];
[self.navigationController pushViewController:jsonViewController animated:YES];
[backButton release];
[jsonViewController release];
}
The first time around you get the alert view (which is an error message). After that nothing happens when u click on a row. but i know it goes into the method given below. would anyone know why? Does it have something to do with me pushing views? and not popping them?

Answer 1

Defer the push until the next runLoop, to let the tableView return:
dispatch_async(dispatch_get_main_queue(), ^ {
NSLog(#"Going to push...");
NSLog(#"...view Controller %#", jsonViewController);
[self.navigationController pushViewController:jsonViewController animated:YES];
[jsonViewController release];
NSLog(#"Just pushed %#", jsonViewController);
) );
Just to be clear, remove both these lines from the existing code:
[self.navigationController pushViewController:jsonViewController animated:YES];
[jsonViewController release];