How do I get the navigation bar in a UINavigationController to update its position when the status bar is hidden?

Question

I have a UINavigationController with a visible Navigation Bar. I have one particular UIViewController which I\'d like to hide the status bar when p

Answer 1

I found the solutions above didn't quite work when the view is in the middle of an animated presentation, so I deferred hiding the status bar as follows:

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    // doesn't work immediately because modal view has to finish loading
    dispatch_async(dispatch_get_main_queue(), ^(){
        [[UIApplication sharedApplication] setStatusBarHidden:YES];
        self.view.frame = [UIScreen mainScreen].applicationFrame;
    });
}

Answer 2

You should try resizing the frame of your UIViewControllers's view after you have hidden the StatusBar. The applicationFrame updates it's origin.y and size.height during the setStatusBarHidden:animated: method.

CGRect rect = [UIScreen mainScreen].applicationFrame;
self.view.frame = rect;

[self.view setNeedsLayout];

Answer 3

In your root view controller (where you want to show the status bar):

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    [[UIApplication sharedApplication] setStatusBarHidden:NO animated:YES];;
}

In the view controller you push on the stack (where you want to hide the status bar):

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];;
}

Edit:

I realize now you want to hide the status bar. Got them mixed up since you were showing/hiding the nav bar in the code you posted. My mistake. It's essentially the same code, anyway:

In your root view controller (where you want to show the status bar):

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    [[UIApplication sharedApplication] setStatusBarHidden:NO animated:YES];
}

In the view controller you push on the stack (where you want to hide the status bar):

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];
}

I just tested this with an existing project and it worked.

Answer 4

There are two ways that you can do what you are asking.

One is to manually move the navigation bar:

In viewWillAppear:

    [UIApplication sharedApplication].statusBarHidden = YES;
    self.view.frame = [UIScreen mainScreen].applicationFrame;
    CGRect frame = self.navigationController.navigationBar.frame;
    frame.origin.y = 0;
    self.navigationController.navigationBar.frame = frame;

In viewWillDisappear:

    [UIApplication sharedApplication].statusBarHidden = NO;
    CGRect frame = self.navigationController.navigationBar.frame;
    frame.origin.y = 20.0;
    self.navigationController.navigationBar.frame = frame;

Things will also be okay if you are willing to turn off the navigation bar as well, although I suspect that is not what you wanted:

    [UIApplication sharedApplication].statusBarHidden = YES;
    self.navigationController.navigationBarHidden = YES;