相关疑难解决方法(0)

我有以下代码,为模态视图添加导航控制器.导航栏和视图都显示正常,但右键不显示.我究竟做错了什么？

    UpgradesViewController* upgradesViewController = [[UpgradesViewController alloc] initWithNibName:@"UpgradesView" bundle:nil];
    upgradesViewController.title = @"Upgrades";

    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:upgradesViewController];
    navController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    navController.navigationBar.barStyle = UIBarStyleBlack;
    UIBarButtonItem* doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Show" style:UIBarButtonItemStylePlain target: self  action:nil];
    navController.navigationItem.rightBarButtonItem = doneButton;
    [self presentModalViewController:navController animated:YES];

    [navController release];
    [upgradesViewController release];