UITableViewController isn't pushing views onto the stack

I have a UITableViewController that has a UISearchbar in its header view. When the user searches, my UITableView populates with the results. I want to push a new view controller onto the stack when the user selects a result.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

    if (cell.accessoryType == UITableViewCellAccessoryNone) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;

        WatchlistSheetView* watchlistSheetView = [[WatchlistSheetView alloc] initWithNi开发者_如何转开发bName:@"WatchlistSheetView" bundle:nil];
        watchlistSheetView.symbol = cell.textLabel.text;
        [self.navigationController pushViewController:watchlistSheetView animated:YES];
        [watchlistSheetView release];

        //[self dismissModalViewControllerAnimated:YES];
    }     
}

The following doesn't push a view controller onto the stack. Nothing happens. How can I resolve?

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I guess that self.navigationController is nil, so that the message pushViewController is sent nowhere.

To fix this, you can create a UINavigationController in your application:didFinishLaunching and push your table view controller on to it as its root controller, along these lines:

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    UINavigationController* navigation = [[UINavigationController alloc] init];

   ....
   [navigation pushViewController:yourTableViewController animated:NO];
   ...
   [window addSubview:[navigation view]];
   [self.window makeKeyAndVisible];
}

or you could use initWithRootController to initialize the navigation view controller with your table view controller.

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It appears that you are calling self when referencing your navigation controller. Did you actually allocate a navigation controller and assign it to self?