UINavigationController shows blank view - objective-c

Question

I am making a simple navigation based application that drills down one level and show a new xib file each time. When I drill down one level my screen shows up blank. I still have the navigation controller at the top with a back button but my view dosent load.
Here is my code
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
circle_area *subViewOneController = [[circle_area alloc] init];
UIViewController *tvc = subViewOneController;
if (indexPath.row == 0 && indexPath.section == 0) {
[[self navigationController] pushViewController:tvc animated:YES];
}
}
like I said this returns a blank screen.
My updated Code:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
circle_area *subViewOneController = [[circle_area alloc] init];
UIViewController *tvc = subViewOneController;
switch (indexPath.section) {
case 0:
switch (indexPath.row) {
case 0:
NSLog(#"section %i special button!", indexPath.section);
NSLog(#"row %i special button!", indexPath.row);
break;
default:
break;
}
break;
default:
break;
}
NSLog(#"section %i!", indexPath.section);
NSLog(#"row %i!", indexPath.row);
NSLog(tvc.view.recursiveDescription);
if (indexPath.row == 0 && indexPath.section == 0) {
[[self navigationController] pushViewController:subViewOneController animated:YES];
}
[tvc release];
}
Last time i left out the switches in the middle, it dosent look like they would effect anything , but i included them this time.

Answer 1

circle_area *subViewOneController = [[circle_area alloc] init];
In this line, you are creating an instance of the circle_area class and assigning it to the pointer called subViewOneController.
UIViewController *tvc = subViewOneController;
In this line, you are assigning that same instance to a pointer called tvc. This pointer is defined to point to an instance of the UIViewController class.
It's not clear what you are trying to do here. What is circle_area? Why the redundant assignment? Is circle_area a subclass of UIViewController? If it isn't, then that's the problem and you should have been warned about it by the compiler.
In addition, you have a memory leak. You allocate memory for this circle_area instance, but you don't release it.