objective-c - NavigationBar 在 pushViewController 时不显示正确

Question

这个问题用图片很容易理解。我有一个 UINavigationController，允许用户在 View 之间切换。

第一个 View 包含一个搜索栏和一个表格 View ，如下所示:

第二个是显示单元格信息的基本 View

当我点击搜索栏时，导航 Controller 被隐藏，搜索栏现在位于顶部。

现在，如果我点击一个单元格，它会转到第二个 View ，但导航栏首先隐藏起来，如下所示:

然后，它会自动显示为:

我已经尝试了一些东西，比如在推送下一个 View Controller 之前显示导航栏，但它非常丑陋..有谁知道如何在第二个 View 上直接显示导航栏(比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];
    }
}

如果您还需要什么，尽管问，但我想这里都有。

Answer 1

尝试在每个 View Controller 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];

}