将控制器推入堆栈时，不会显示后退按钮

Question

I created iOS application from Navigation-based application template.
This snippet is from RootViewController.m:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
  DotoViewController *detailViewController = [[DotoViewController alloc] 
                             initWithNibName:@"DotoViewController" bundle:nil];
  NSManagedObject *selectedObject = [[self fetchedResultsController] 
                             objectAtIndexPath:indexPath];

  detailViewController.dotoObj = selectedObject;
  [self.navigationController pushViewController:detailViewController animated:YES];
  [detailViewController release];   
}

DotoViewController is a subclass of UIViewController and has an accompanying NIB file.

Upong clicking on a row, DotoViewController is getting displayed but without the back button to RootViewController on the left side.

What I'm missing?

Answer 1

Perhaps your root view controller has an empty title? The view controller's title is used as the title for the back button, so if you have an empty string there, this can cause the back button to disappear. If it's nil, it should display the standard "Back" though.