从Tabbar控制器获取导航控制器

Question

我正在努力实现两件事：

1）在导航控制器中有一个标签栏控制器

2）根据所选的选项卡，某些导航按钮会发生变化，我想将一些视图推入导航控制器，同时保留在当前选定的选项卡中。

现在，我像这样按下导航控制器：

GenericAddViewController *vc = [[GenericAddViewController alloc]init];
UINavigationController *navigationController = [[UINavigationController alloc]initWithRootViewController:vc];
navigationController.modalPresentationStyle = UIModalPresentationFullScreen;
[self presentViewController:navigationController animated:YES completion: nil];

然后，在GenericAddViewController.m中，我有：

@interface GenericAddViewController ()
@property (strong, nonatomic) UITextField *titleTextField;
@property (nonatomic, strong) UITabBarController *tabBarController;

@end

@implementation GenericAddViewController

-(void)loadView
{
[super loadView];

TabOneController *tabOneController = [[TabOneController alloc]init];
tabOneController.title = @"Steps";

TabTwoController *tabTwoController = [[TabTwoController alloc]init];
tabTwoController.title = @"More Information";   

NSArray *controllers = [NSArray arrayWithObjects:tabOneController, tabTwoController, nil];

self.tabBarController = [[UITabBarController alloc]init];
self.tabBarController.view.frame = CGRectMake(0, 0, 768, 1004);
self.tabBarController.viewControllers = controllers;
self.tabBarController.delegate = self;

}

这很有效。唯一的问题是例如在TabOneController中，我不能做任何这些：

UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(isDone:)];
[self.navigationItem setRightBarButtonItem:doneButton animated:NO];

也不     [self.navigationController push ...]

不应该那么复杂吗？！

非常感谢！