如何从一个特定的视图控制器中隐藏导航栏

Question

我创建了一个两个启动屏幕的 iPhone 应用程序。之后用户被带到第一个视图。我添加了一个 UINavigationController。它工作得很好。

如何单独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;
 }

Answer 1

在视图控制器中试试这个方法：

// 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，它允许你隐藏/显示整个导航控制器的导航栏。

让我们看看下一个层次结构：

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

三个 UIViewController 中的每一个都具有相同的导航栏，因为它们位于 UINavigationController 中。比如你想隐藏 UIViewController2 的 bar（其实在哪一个都没有关系），然后在你的 UIViewController2 中写：

- (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
}

Answer 2

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)
}

Answer 3

这对我有用：

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)
}

Answer 4

在 Swift3 和 Swift4 中使用下面一行代码隐藏导航栏

navigationController?.setNavigationBarHidden(true, animated: true)

显示导航栏

navigationController?.setNavigationBarHidden(false, animated: true)

Answer 5

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

Answer 6

如果之前被隐藏，最好记住：

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)
}

Answer 7

您可以尝试像这样直接将导航栏隐藏到相关的 UIViewController

override func viewWillAppear(_ animated: Bool) {
    self.navigationController?.navigationBar.isHidden = true
    super.viewWillAppear(animated)
}

override func viewWillDisappear(_ animated: Bool) {
    self.navigationController?.navigationBar.isHidden = false
    super.viewWillDisappear(animated)
}

Answer 8

模态显示打开视图，或；

1. 不要将它添加到您的导航控制器中
2. 将其呈现在导航控制器之前。
3. 加载所有内容后，关闭打开视图并显示导航控制器（均无动画）。

---

以这个帖子为例：How can I display a splash screen for longer on an iPhone?

-(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];
}