如何从一个特定的视图控制器隐藏导航栏

我创建了两个启动屏幕iPhone应用程序。之后，将用户带到第一视图。我添加了一个UINavigationController。它工作得很好。

如何仅删除打开视图的导航栏？

主窗口

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    


self.splashScreen = [[SplashScreen alloc] 
                initWithNibName:@"SplashScreen" 
                bundle:nil];
if (self.pageController == nil) {
openingpage *page=[[openingpage alloc]initWithNibName:@"openingpage" bundle:[NSBundle mainBundle]];
    self.pageController = page;
    [page release];
}
[self.navigationController pushViewController:self.pageController animated:YES];

[window addSubview:splashScreen.view];

 [splashScreen displayScreen];
[self.window makeKeyAndVisible];

return YES;
 }

在视图控制器中尝试以下方法：

// swift
self.navigationController?.setNavigationBarHidden(true, animated: true)

// objective-c
[self.navigationController setNavigationBarHidden:YES animated:YES]; 

更多说明：

UINavigationController 有一个属性navigationBarHidden，可让您隐藏/显示整个导航控制器的导航栏。

让我们看下一个层次结构：

--UINavigationController
------UIViewController1
------UIViewController2
------UIViewController3

由于三个UIViewController都位于UINavigationController中，因此它们各自具有相同的导航栏。例如，您要隐藏UIViewController2的栏（实际上，哪一个都没关系），然后在UIViewController2中编写：

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:YES];   //it hides the bar
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self.navigationController setNavigationBarHidden:NO animated:YES]; // it shows the bar back
}

斯威夫特4：

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(true)
    navigationController?.setNavigationBarHidden(true, animated: true)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(true)
    navigationController?.setNavigationBarHidden(false, animated: false)
}

这为我工作：

斯威夫特4

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    navigationController?.setNavigationBarHidden(true, animated: false)
}

//reappears navigation bar on next page
override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    navigationController?.setNavigationBarHidden(false, animated: true)
}

在一行代码下面使用以下代码隐藏Swift3和Swift4中的导航栏

navigationController?.setNavigationBarHidden(true, animated: true)

显示导航栏

navigationController?.setNavigationBarHidden(false, animated: true)

最好记住它是否以前被隐藏了：

private var navigationBarWasHidden = false

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    // Save if it was hidden initially
    self.navigationBarWasHidden = self.navigationController?.isNavigationBarHidden ?? false
    // Hide the Navigation Bar
    self.navigationController?.setNavigationBarHidden(true, animated: animated)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    // Show the Navigation Bar
    self.navigationController?.setNavigationBarHidden(self.navigationBarWasHidden, animated: animated)
}

在c＃或Xamarin.IOS中，this.NavigationController.NavigationBar.Hidden = true;

模态显示打开视图，或者；

1. 不要将其添加到导航控制器
2. 在导航控制器之前展示它。
3. 加载完所有内容后，关闭打开的视图并显示导航控制器（均不包含动画）。

从此线程中举一个例子：如何在iPhone上显示启动屏幕更长的时间？

-(void)applicationDidFinishLaunching:(UIApplication *)application {
    [window addSubview:splashView];
    [NSThread detachNewThreadSelector:@selector(getInitialData:) 
                                 toTarget:self withObject:nil];
}

-(void)getInitialData:(id)obj {
    [NSThread sleepForTimeInterval:3.0]; // simulate waiting for server response
    [splashView removeFromSuperview];
    [window addSubview:tabBarController.view];
}