经过多次试验，这里是我如何让它为我想要的工作。 这就是我一直在尝试的。 -我有一个图像视图。我想把图片全屏显示。 -我有一个导航控制器与选项卡太。所以我也要把它藏起来。 此外，我的主要要求不仅仅是隐藏，而且在显示和隐藏时也要有淡出效果。

这就是我让它工作的方法。

步骤1 -我有一个图像和用户点击该图像一次。我捕捉那个手势并把它推到新的imageViewController中，它在imageViewController中，我想要全屏图像。

- (void)handleSingleTap:(UIGestureRecognizer *)gestureRecognizer {  
NSLog(@"Single tap");
ImageViewController *imageViewController =
[[ImageViewController alloc] initWithNibName:@"ImageViewController" bundle:nil];

godImageViewController.imgName  = // pass the image.
godImageViewController.hidesBottomBarWhenPushed=YES;// This is important to note. 

[self.navigationController pushViewController:godImageViewController animated:YES];
// If I remove the line below, then I get this error. [CALayer retain]: message sent to deallocated instance . 
// [godImageViewController release];
} 

步骤2 -下面所有这些步骤都在ImageViewController中

步骤2.1 -在ViewDidLoad中，显示导航栏

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
NSLog(@"viewDidLoad");
[[self navigationController] setNavigationBarHidden:NO animated:YES];
}

步骤2.2 -在viewDidAppear中，设置一个有延迟的定时器任务(我把它设置为1秒延迟)。并且在延迟之后，添加渐褪色效果。我用alpha来进行衰落。

- (void)viewDidAppear:(BOOL)animated
{
NSLog(@"viewDidAppear");

myTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self     selector:@selector(fadeScreen) userInfo:nil repeats:NO];
}

- (void)fadeScreen
{
[UIView beginAnimations:nil context:nil]; // begins animation block
[UIView setAnimationDuration:1.95];        // sets animation duration
self.navigationController.navigationBar.alpha = 0.0;       // Fades the alpha channel of   this view to "0.0" over the animationDuration of "0.75" seconds
[UIView commitAnimations];   // commits the animation block.  This Block is done.
}

步骤2.3 -在viewWillAppear下，添加singleTap手势到图像，并使导航栏半透明。

- (void) viewWillAppear:(BOOL)animated
{

NSLog(@"viewWillAppear");


NSString *path = [[NSBundle mainBundle] pathForResource:self.imgName ofType:@"png"];

UIImage *theImage = [UIImage imageWithContentsOfFile:path];

self.imgView.image = theImage;

// add tap gestures 
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];  
[self.imgView addGestureRecognizer:singleTap];  
[singleTap release];  

// to make the image go full screen
self.navigationController.navigationBar.translucent=YES;
}

- (void)handleTap:(UIGestureRecognizer *)gestureRecognizer 
{ 
 NSLog(@"Handle Single tap");
 [self finishedFading];
  // fade again. You can choose to skip this can add a bool, if you want to fade again when user taps again. 
 myTimer = [NSTimer scheduledTimerWithTimeInterval:5.0 target:self  selector:@selector(fadeScreen) userInfo:nil repeats:NO];
 }

第三步-最后在viewWillDisappear中，确保把所有的东西放回去

- (void)viewWillDisappear: (BOOL)animated 
{ 
self.hidesBottomBarWhenPushed = NO; 
self.navigationController.navigationBar.translucent=NO;

if (self.navigationController.topViewController != self)
{
    [self.navigationController setNavigationBarHidden:NO animated:animated];
}

[super viewWillDisappear:animated];
}

我将把代码放在viewWillAppear委托中显示每个视图:

就像你需要隐藏它的地方:

- (void)viewWillAppear:(BOOL)animated
{
        [yourObject hideBar];
}

就像这样，你需要展示它:

- (void)viewWillAppear:(BOOL)animated
{
        [yourObject showBar];
}

只在第一页隐藏导航栏也可以通过故事板实现。在故事板上，进入导航控制器场景->导航栏。从属性检查器中选择“Hidden”属性。这将从第一个视图控制器开始隐藏导航条，直到所需的视图控制器可见为止。

导航栏可以在ViewController的ViewWillAppear回调中设置为可见。

-(void)viewWillAppear:(BOOL)animated {

    [self.navigationController setNavigationBarHidden:YES animated:animated];
    [super viewWillAppear:animated];                                                  
}

我发现的另一种方法是为NavigationController设置一个委托:

navigationController.delegate = self;

然后使用setNavigationBarHidden in navigationController:willShowViewController:animated:

- (void)navigationController:(UINavigationController *)navigationController 
      willShowViewController:(UIViewController *)viewController 
                    animated:(BOOL)animated 
{   
    // Hide the nav bar if going home.
    BOOL hide = viewController != homeViewController;
    [navigationController setNavigationBarHidden:hide animated:animated];
}

在一个地方为每个ViewController定制行为的简单方法。

通过在你的ViewController中实现这个代码，你可以得到这个效果 实际上窍门是，当控制器被启动时隐藏navigationBar

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

并在用户离开该页面时取消隐藏导航栏，这是viewWillDisappear

- (void)viewWillDisappear:(BOOL)animated {
    [self.navigationController setNavigationBarHidden:NO animated:YES];
    [super viewWillDisappear:animated];
}

如果有人仍然对@fabb在接受的答案中评论的快速反滑取消错误有问题。

我设法通过覆盖viewDidLayoutSubviews来修复这个问题，除了viewWillAppear/viewWillDisappear，如下所示:

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

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

//*** This is required to fix navigation bar forever disappear on fast backswipe bug.
override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    self.navigationController?.setNavigationBarHidden(false, animated: false)
}

在我的例子中，我注意到这是因为根视图控制器(其中nav是隐藏的)和被推的视图控制器(nav是显示的)有不同的状态栏风格(例如暗和亮)。当你开始向后滑动以弹出视图控制器时，会有额外的状态栏颜色动画。如果你为了取消交互式弹出而松开手指，而状态栏动画还没有完成，导航栏就永远消失了!

但是，如果两个视图控制器的状态栏样式相同，则不会出现此错误。