iPhone hide Navigation Bar only on first page

Question

I have the code below that hides and shows the navigational bar   It is hidden when the first view loads and then hidden when the  children  get called   Trouble is that I cannot find the event action to trigger it to hide again when they get back to the root view      I have a  test  button on the root page that manually does the action but it is not pretty and I want it to be automatic   - void hideBar        self navController navigationBarHidden   YES    - void showBar               self navController navigationBarHidden   NO

User · Answer

One slight tweak I had to make on the other answers is to only unhide the bar in viewWillDisappear if the reason it is disappearing is due to a navigation item being pushed on it. This is because the view can disappear for other reasons.

So I only unhide the bar if this view is no longer the topmost view:

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

    [super viewWillDisappear:animated];
}

User · Answer

If what you want is to hide the navigation bar completely in the controller  a much cleaner solution is to  in the root controller  have something like    implementation MainViewController -  void viewDidLoad       self navigationController navigationBarHidden YES           extra code on view load       When you push a child view in the controller  the Navigation Bar will remain hidden  if you want to display it just in the child  you ll add the code for displaying it self navigationController navigationBarHidden NO   in the viewWillAppear callback  and similarly the code for hiding it on viewWillDisappear

User · Answer

After multiple trials here is how I got it working for what I wanted   This is what I was trying   - I have a view with a image  and I wanted to have the image go full screen   - I have a navigation controller with a tabBar too  So i need to hide that too   - Also  my main requirement was not just hiding  but having a fading effect too while showing and hiding   This is how I got it working    Step 1 - I have a image and user taps on that image once  I capture that gesture and push it into the new imageViewController  its in the imageViewController  I want to have full screen image   -  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        Step 2 - All these steps below are in the ImageViewController  Step 2 1 - In ViewDidLoad  show the navBar  -  void viewDidLoad    super viewDidLoad      Do any additional setup after loading the view from its nib  NSLog   viewDidLoad      self navigationController  setNavigationBarHidden NO animated YES       Step 2 2 - In viewDidAppear  set up a timer task with delay   I have it set for 1 sec delay   And after the delay  add fading effect  I am using alpha to use fading   -  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      step 2 3 - Under viewWillAppear  add singleTap gesture to the image and make the navBar translucent    -  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        Step 3 - Finally in viewWillDisappear  make sure to put all the stuff back   -  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

User · Answer

Swift 4   In the view controller you want to hide the navigation bar from   override func viewWillAppear   animated  Bool        self navigationController  setNavigationBarHidden true  animated  animated      super viewWillAppear animated     override func viewWillDisappear   animated  Bool        self navigationController  setNavigationBarHidden false  animated  animated      super viewWillDisappear animated

User · Answer

Another approach I found is to set a delegate for the NavigationController   navigationController delegate   self    and use 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       Easy way to customize the behavior for each ViewController all in one place

User · Answer

Hiding navigation bar only on first page can be achieved through storyboard as well  On storyboard  goto Navigation Controller Scene- Navigation Bar  And select  Hidden  property from the Attributes inspector  This will hide navigation bar starting from first viewcontroller until its made visible for the required viewcontroller    Navigation bar can be set back to visible in  ViewController s ViewWillAppear callback   - void viewWillAppear  BOOL animated         self navigationController setNavigationBarHidden YES animated animated        super viewWillAppear animated

User · Answer

In case anyone still having trouble with the fast backswipe cancelled bug as  fabb commented in the accepted answer   I manage to fix this by overriding viewDidLayoutSubviews  in addition to viewWillAppear viewWillDisappear as shown below   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      In my case  I notice that it is because the root view controller  where nav is hidden  and the pushed view controller  nav is shown  has different status bar styles  e g  dark and light   The moment you start the backswipe to pop the view controller  there will be additional status bar colour animation  If you release your finger in order to cancel the interactive pop  while the status bar animation is not finished  the navigation bar is forever gone   However  this bug doesn t occur if status bar styles of both view controllers are the same

User · Answer

The nicest solution I have found is to do the following in the first view controller  Objective-C -  void viewWillAppear  BOOL animated        self navigationController setNavigationBarHidden YES animated animated        super viewWillAppear animated      -  void viewWillDisappear  BOOL animated        self navigationController setNavigationBarHidden NO animated animated        super viewWillDisappear animated      Swift override func viewWillAppear   animated  Bool        self navigationController  setNavigationBarHidden true  animated  animated      super viewWillAppear animated     override func viewWillDisappear   animated  Bool        self navigationController  setNavigationBarHidden false  animated  animated      super viewWillDisappear animated      This will cause the navigation bar to animate in from the left  together with the next view  when you push the next UIViewController on the stack  and animate away to the left  together with the old view   when you press the back button on the UINavigationBar  Please note also that these are not delegate methods  you are overriding UIViewController s implementation of these methods  and according to the documentation you must call the super s implementation somewhere in your implementation

User · Answer

The currently accepted answer does not match the intended behavior described in the question  The question asks for the navigation bar to be hidden on the root view controller  but visible everywhere else  but the accepted answer hides the navigation bar on a particular view controller  What happens when another instance of the first view controller is pushed onto the stack  It will hide the navigation bar even though we are not looking at the root view controller   Instead   Chad M  s strategy of using the UINavigationControllerDelegate is a good one  and here is a more complete solution  Steps    Subclass UINavigationController Implement the -navigationController willShowViewController animated method to show or hide the navigation bar based on whether it is showing the root view controller Override the initialization methods to set the UINavigationController subclass as its own delegate   Complete code for this solution can be found in this Gist  Here s the navigationController willShowViewController animated implementation   -  void navigationController  UINavigationController   navigationController willShowViewController  UIViewController   viewController animated  BOOL animated          Hide navigation bar if root controller        if   viewController isEqual  self viewControllers firstObject               self setNavigationBarHidden YES animated animated         else            self setNavigationBarHidden NO animated animated

User · Answer

I would put the code in the viewWillAppear delegate on each view being shown   Like this where you need to hide it   -  void viewWillAppear  BOOL animated            yourObject hideBar       Like this where you need to show it   -  void viewWillAppear  BOOL animated            yourObject showBar

User · Answer

in Swift 3   override func viewWillAppear   animated  Bool        navigationController  navigationBar isHidden   true     super viewWillAppear animated      override func viewWillDisappear   animated  Bool        if  navigationController  topViewController    self            navigationController  navigationBar isHidden   false           super viewWillDisappear animated

User · Answer

By implement this code in your ViewController you can get this effect  Actually the trick is   hide the navigationBar when that Controller is launched   -  void viewWillAppear  BOOL animated        self navigationController setNavigationBarHidden YES animated YES        super viewWillAppear animated       and unhide the navigation bar when user leave that page  do this is viewWillDisappear   -  void viewWillDisappear  BOOL animated        self navigationController setNavigationBarHidden NO animated YES        super viewWillDisappear animated

User · Answer

The simplest implementation may be to just have each view controller specify whether its navigation bar is hidden or not in its viewWillAppear animated  method  The same approach works well for hiding showing the toolbar as well   -  void viewWillAppear  BOOL animated        self navigationController setToolbarHidden YES NO animated animated        super viewWillAppear animated

User · Answer

Give my credit to  chad-m  s answer   Here is the Swift version    Create a new file MyNavigationController swift     import UIKit  class MyNavigationController  UINavigationController  UINavigationControllerDelegate        override func viewDidLoad             super viewDidLoad               Do any additional setup after loading the view          self delegate   self            func navigationController   navigationController  UINavigationController  willShow viewController  UIViewController  animated  Bool            if viewController    self viewControllers first               self setNavigationBarHidden true  animated  animated            else               self setNavigationBarHidden false  animated  animated                        Set your UINavigationController s class in StoryBoard to MyNavigationController  That s it    Difference between chad-m s answer and mine    Inherit from UINavigationController  so you won t pollute your rootViewController  use self viewControllers first rather than homeViewController  so you won t do this 100 times for your 100 UINavigationControllers in 1 StoryBoard

[ios] iPhone hide Navigation Bar only on first page

Examples related to ios

Examples related to uinavigationcontroller

Examples related to hide