Navigation bar show hide

Question

I have an app with a navigation bar consisting of 2 bar buttons  I would like to hide and show this navigation bar when a user double taps the screen   Initially  the navigation bar should be hidden  When a user double taps the screen  the navigation bar should come up with an animation  like what can be seen in the iPhone s photo gallery   How can i do something this  Suggestions are always appreciated

User · Answer

This code will help you   UITapGestureRecognizer  tapGesture     UITapGestureRecognizer alloc   initWithTarget self action  selector showHideNavbar      self view addGestureRecognizer tapGesture    - void  showHideNavbar  id  sender        write code to show hide nav bar here     check if the Navigation Bar is shown if  self navigationController navigationBar hidden    NO       hide the Navigation Bar  self navigationController setNavigationBarHidden YES animated YES        if Navigation Bar is already hidden else if  self navigationController navigationBar hidden    YES       Show the Navigation Bar  self navigationController setNavigationBarHidden NO animated YES

User · Answer

In Swift try this  navigationController  isNavigationBarHidden   true    Hide navigationController  isNavigationBarHidden   false   Show  or navigationController  setNavigationBarHidden true  animated  true    Hide navigationController  setNavigationBarHidden false  animated  true    Show

User · Answer

In Swift 4 2 and Xcode 10  self navigationController  isNavigationBarHidden   true    Hide self navigationController  isNavigationBarHidden   false    Show   If you don t want to display Navigation bar only in 1st VC  but you want display in 2nd VC onword s  In your 1st VC write this code   override func viewWillAppear   animated  Bool        self navigationController  isNavigationBarHidden   true    Hide    override func viewWillDisappear   animated  Bool        self navigationController  isNavigationBarHidden   false    Show

User · Answer

Here is a very quick and simple solution   self navigationController hidesBarsOnTap   YES    This will work on single tap instead of double tap  Also it will change the behavior for the navigation controller even after pushing or popping the current view controller    You can always modify this behavior in your controller within the viewWillAppear  and viewWillDisappear  actions if you would like to set the behavior only for a single view controller    Here is the documentation

User · Answer

This isn t something that can fit into a few lines of code  but this is one approach that might work for you  To hide the navigation bar    self navigationController  setNavigationBarHidden YES animated YES    To show it    self navigationController  setNavigationBarHidden NO animated YES    Documentation for this method is available here  To listen for a  quot double click quot  or double-tap  subclass UIView and make an instance of that subclass your view controller s view property  In the view subclass  override its -touchesEnded withEvent  method and count how many touches you get in a duration of time  by measuring the time between two consecutive taps  perhaps with CACurrentMediaTime    Or test the result from  touch tapCount   If you get two taps  your subclassed view issues an NSNotification that your view controller has registered to listen for  When your view controller hears the notification  it fires a selector that either hides or shows the navigation bar using the aforementioned code  depending on the navigation bar s current visible state  accessed through reading the navigation bar s isHidden property  EDIT The part of my answer for handling tap events is probably useful back before iOS 3 1  The UIGestureRecognizer class is probably a better approach for handling double-taps  these days  EDIT 2 The Swift way to hide the navigation bar is  navigationController  setNavigationBarHidden true  animated  true   To show it  navigationController  setNavigationBarHidden false  animated  true

User · Answer

One way could be by unchecking Bar Visibility  Shows Navigation Bar  In Attribute Inspector Hope this help someone

User · Answer

First read the the section in the View Controller Programming Guide for iOS about  Adopting a Full-Screen Layout for Navigation Views  and the section about the same for Custom Views  If you are trying to do something like the Photos app then you are probably using a scroll view  Note the comment that Navigation bars automatically add a scroll content inset to your scroll view to account for the height of the navigation bar  and status bar  so you have to reset the contentInset property of your scroll view back to zero  UIEdgeInsetsZero  right after setting up the initial state of the navigationBar and before the view appears   Then if you have a single tap that toggles the navigationBar and or status bar to show or hide  you need to do two things in you toggling method  The first seems to be to save the scroll view s contentOffset property before changing the NavigationBar hidden property and restore your saved value to contentOffset right afterward  And second to again zero out the contentInset property to UIEdgeInsetsZero after changing the navigationBarHidden property  Also  if you are toggling the status bar  you need to change its state before you change the navigationBar s state

User · Answer

If you want to detect the status of navigation bar wether it is   hidden shown  You can simply use following code to detect -   if self navigationController  isNavigationBarHidden      print  Show navigation bar     else       print  hide navigation bar

User · Answer

To hide Navigation bar     self navigationController setNavigationBarHidden YES animated YES     To show Navigation bar     self navigationController setNavigationBarHidden NO animated YES

User · Answer

SWIFT CODE  This works fully for iOS 3 2 and later      override func viewDidAppear animated  Bool        super viewDidAppear animated       let tapGesture   UITapGestureRecognizer target  self  action   hideNavBarOntap  let tapGesture   UITapGestureRecognizer target  self  action   hideNavBarOntap       tapGesture delegate   self     self view addGestureRecognizer tapGesture    then write  func hideNavBarOntap         if self navigationController  navigationBar hidden    false            self navigationController  setNavigationBarHidden true  animated  true     hide nav bar is not hidden       else if self navigationController  navigationBar hidden    true            self navigationController  setNavigationBarHidden false  animated  true     show nav bar

User · Answer

hidesBarsOnTap on UINavigationController property come out to handle just this with iOS8 SDK  https   developer apple com library prerelease ios documentation UIKit Reference UINavigationController Class    apple ref occ instp UINavigationController hidesBarsOnTap

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