Question

我在我的app委托中设置了UINavigationController，并用它来推送我的登录页面。一旦loggeI-in，被调用的视图将显示UITabBarController，并为每个选项卡分别提供UINavigationController。我的问题是，当我通过我的标签栏中的导航控制器推送视图时，它什么都不做。它根本不会推动观点。我不知道接下来要做什么使pushViewController工作。很感谢任何形式的帮助。感谢。

这是我的代码：

登录时将从rootView类

调用此函数

- (void) login
{
   UIViewController *_mainPageViewController = [[MainPageViewController alloc] initWithNibName:@"MainPageViewController" bundle:[NSBundle mainBundle]];
   [self.navigationController pushViewController:_mainPageViewController animated:YES];
}

MainPageViewController.class--

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
   if (self) {  
        [self setUpTabBar];
    }
    return self;
}

-(void)setUpTabBar { 

MeViewController *_meViewController = [[MeViewController alloc]init];
_meViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"me" 
                                                             image:[UIImage imageNamed:@"img1.png"] tag:1];
UINavigationController *firstNavController = [[UINavigationController alloc]initWithRootViewController:_meViewController];

TodoViewController *_todoViewController = [[TodoViewController alloc]init];
_meViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"me" 
                                                             image:[UIImage imageNamed:@"img2.png"] tag:1];
UINavigationController *secondNavController = [[UINavigationController alloc]initWithRootViewController:_meViewController];

mainBarController.viewControllers = [[NSArray alloc] initWithObjects: firstNavController, secondNavController, nil];
mainBarController.delegate = self;
mainBarController.selectedIndex=0;

[firstNavController release];
[_meViewController release];   
[secondNavController release];
[_exploreViewController release];

[[[UIApplication sharedApplication]keyWindow]addSubview:mainBarController.view];
}

MeViewController.class--它根本不会推送视图

- (IBAction)showMeInfo:(id)sender {
UIViewController *_meInfoViewController = [[MeInfoViewController alloc] initWithNibName:@"MeInfoViewController" bundle:[NSBundle mainBundle]];

[self.navigationController pushViewController:_meInfoViewController animated:YES];
}

Answer 1

我不确定我是否100％理解，但这里是 -

我假设MainPageViewController是UITabBarController的子类。如果是这种情况，则不需要mainBarController变量，因为此类中的选项卡栏控制器将为self。你会打电话给

self.viewControllers = [NSArray arrayWithObjects: firstNavController, secondNavController, nil];

另外，因为您要将MainPageViewController的实例推送到现有的UINavigationController实例，所以您不需要在MainPageViewController代码中添加任何子视图 - 例如代码行

[[[UIApplication sharedApplication]keyWindow]addSubview:mainBarController.view];

不是必需的，也不应该存在（UINavigationController会自动控制哪些视图可见等，具体取决于从导航堆栈中推送/弹出的视图控制器。）

UINavigationController不推送视图

1 个答案: