NavigationBar时,NavigationBar不显示正确的值

Question

用图片理解这个问题非常简单.我有一个UINavigationController,允许用户在视图之间切换.

第一个视图包含一个搜索栏和一个表格视图,如下所示:

第二个是显示有关单元格信息的基本视图

当我单击搜索栏时,导航控制器将被隐藏,搜索栏现在位于顶部.

现在,如果我单击一个单元格,它将转到第二个视图,但导航栏首先隐藏如下:

然后,它会自动显示如下:

我在推动下一个视图控制器之前尝试了一些像显示导航栏这样的东西,但它很难看.有谁知道如何直接在第二个视图上显示导航栏(如在联系人应用程序中)？

[更新]:代码

AppDelegate.m(我说的是navigationcontroller2)

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{    
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    FirstViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
    SecondViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];

    viewController1.managedObjectContext = [self managedObjectContext];
    viewController2.managedObjectContext = [self managedObjectContext];
    viewController1.viewController2 = viewController2;

    UINavigationController *navigationcontroller1 = [[UINavigationController alloc] initWithRootViewController:viewController1];
    [navigationcontroller1.navigationBar setTintColor:[UIColor lightGrayColor]];
    UINavigationController *navigationcontroller2 = [[UINavigationController alloc] initWithRootViewController:viewController2];
    [navigationcontroller2.navigationBar setTintColor:[UIColor lightGrayColor]];

    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:navigationcontroller1, navigationcontroller2, nil];

    self.window.rootViewController = self.tabBarController;
    [self.window makeKeyAndVisible];

    return YES;
}

FirstView.m

- (void) searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar {
    [self.navigationController setNavigationBarHidden:YES animated:YES];
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (!noResultsToDisplay) {
        PinDetailsViewController *pinDetailsViewController = [[PinDetailsViewController alloc] initWithNibName:@"PinDetailsViewController" bundle:nil];
        NSManagedObject *managedObject = [fetchedResultsController objectAtIndexPath:indexPath];
        Pin *pin = (Pin *) managedObject;

        [self.navigationItem setTitle:@"Pins"];
        [self.navigationController pushViewController:pinDetailsViewController animated:YES];
        [pinDetailsViewController updateWithPin:pin];
    }
}

如果您还需要其他任何东西,请问,但我认为这就是全部.

Answer 1

尝试在每个viewcontroller中使用此代码.

- (void) viewWillAppear:(BOOL)animated
{

    [self.navigationController setNavigationBarHidden:NO animated:animated];

}


- (void) viewWillDisappear:(BOOL)animated
{
    [self.navigationController setNavigationBarHidden:YES animated:animated];

}