Programmatically get height of navigation bar

Question

I know that the presence of the more view controller  navigation bar  pushes down the UIView by its height   I also know that this height   44px   I have also discovered that this push down maintains the  self view  frame origin y   0   So how do I determine the height of this navigation bar  other than just setting it to a constant   Or  shorter version  how do I determine that my UIView is showing with the navigation bar on top     The light bulb started to come on  Unfortunately  I have not discovered a uniform way to correct the problem  as described below   I believe that my whole problem centers on my autoresizingMasks  And the reason I have concluded that is the same symptoms exist  with or without a UIWebView  And that symptom is that everything is peachy for Portrait  For Landscape  the bottom-most UIButton pops down behind the TabBar   For example  on one UIView  I have  from top to bottom   UIView     both springs set  default case  and no struts  UIScrollView - If I set the two springs  and clear everything else  like the UIView   then the UIButton intrudes on the object immediately above it  If I clear everything  then UIButton is OK  but the stuff at the very top hides behind the StatusBar Setting only the top strut  the UIButton pops down behind the Tab Bar   UILabel and UIImage next vertically     top strut set  flexible everywhere else  Just to complete the picture for the few that have a UIWebView   UIWebView - Struts  top  left  right Springs  both  UIButton     nothing set  i e   flexible everywhere  Although my light bulb is dim  there appears to be hope     Please bear with me because I needed more room than that provided for a short reply comment   Thanks for trying to understand what I am really fishing for     so here goes   1  Each UIViewController  a TabBar app  has a UIImage  some text and whatever on top  Another common denominator is a UIButton on the bottom  On some of the UIViewControllers I have a UIWebView above the UIButton   So  UIImage  text etc  UIWebView  on SOME  UIButton  Surrounding all the above is a UIScrollView   2  For those that have a UIWebView  its autoresizingMask looks like                                               ----                                  V The UIButton s mask has nothing set  i e   flexible everywhere  Within my -viewDidLoad  I call my -repositionSubViews within which I do the following   If there is no UIWebView  I do nothing except center the UIButton that I placed with IB   If I do have a UIWebView  then I determine its  content Height and set its frame to enclose the entire content   UIScrollView  scrollViewInsideWebView     webView  subviews  lastObject   webViewContentHeight   scrollViewInsideWebView contentSize height   webView  setFrame CGRectMake webViewOriginX  webViewOriginY                            sameWholeViewScrollerWidth  webViewContentHeight     Once I do that  then I programmatically push the UIButton down so that it ends up placed below the UIWebView   Everything works  until I rotate it from Portrait to Landscape   I call my -repositionSubViews within my -didRotateFromInterfaceOrientation   Why does the content height of my UIWebView not change with rotation    From Portrait to Landscape  the content width should expand and the content height should shrink  It does visually as it should  but not according to my NSLog   Anyway  with or without a UIWebView  the button I ve talked about moves below the TabBar when in Landscape mode but it will not scroll up to be seen  I see it behind the TabBar when I scroll  vigorously   but then it  falls back  behind the TabBar   Bottom line  this last is the reason I ve asked about the height of the TabBar and the NavigationBar because the TabBar plants itself at the bottom of the UIView and the NavigationBar pushes the UIView down   Now  I m going to add a comment or two here because they wouldn t have made sense earlier   With no UIWebView  I leave everything as is as seen by IB   With a UIWebView  I increase the UIWebView s frame height to its contentHeight and also adjust upward the height of the surrounding UIScrollView that surrounds all the sub-views   Well there you have it

User · Answer

I have used   let originY  CGFloat   self navigationController  navigationBar frame maxY   Working great if you want to get the navigation bar height AND its Y origin

User · Answer

iOS 14 For me  view window is null on iOS 14  extension UIViewController       var topBarHeight  CGFloat           var top   self navigationController  navigationBar frame height    0 0         if  available iOS 13 0                   top    UIApplication shared windows first  windowScene  statusBarManager  statusBarFrame height    0           else               top    UIApplication shared statusBarFrame height                   return top

User · Answer

Did you try this   let barHeight   self navigationController  navigationBar frame height    0

User · Answer

Handy Swift 4 extension  in case it s helpful to someone else  Works even if the current view controller does not display a navigation bar  import UIKit  extension UINavigationController     static public func navBarHeight   - gt  CGFloat       let nVc   UINavigationController rootViewController  UIViewController nibName  nil  bundle  nil       let navBarHeight   nVc navigationBar frame size height     return navBarHeight        Usage  UINavigationController navBarHeight

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Swift version   let navigationBarHeight  CGFloat   self navigationController  navigationBar frame height

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My application has a couple views that required a customized navigation bar in the UI for look  amp  feel  however without navigation controller  And the application is required to support iOS version prior to iOS 11  so the handy safe area layout guide could not be used  and I have to adjust the position and height of navigation bar programmatically   I attached the Navigation Bar to its superview directly  skipping the safe area layout guide as mentioned above  And the status bar height could be retrieved from UIApplication easily  but the default navigation bar height is really a pain-ass     It struck me for almost half a night  with a number of searching and testing  until I finally got the hint from another post  not working to me though   that you could actually get the height from UIView sizeThatFits    like this   -  void viewWillLayoutSubviews       self topBarHeightConstraint constant    UIApplication sharedApplication  statusBarFrame size height      self navBarHeightConstraint constant    self navigationBar sizeThatFits CGSizeZero  height        super viewWillLayoutSubviews           Finally  a perfect navigation bar looking exactly the same as the built-in one

User · Answer

If you want to get the navigationBar height only  it s simple   extension UIViewController     var navigationBarHeight  CGFloat          return self navigationController  navigationBar frame height    0 0          However  if you need the height of top notch of iPhone you don t need to get the navigationBar height and add to it the statusBar height  you can simply call safeAreaInsets that s why exist    self view safeAreaInsets top

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UIImage image    UIImage imageNamed   logo     float targetHeight   self navigationController navigationBar frame size height  float logoRatio   image size width   image size height  float targetWidth   targetHeight   logoRatio   UIImageView logoView     UIImageView alloc  initWithImage image      X or Y position can not be manipulated because autolayout handles positions     logoView setFrame CGRectMake  self navigationController navigationBar frame size width - targetWidth    2    self navigationController navigationBar frame size height - targetHeight    2   targetWidth  targetHeight     logoView setFrame CGRectMake 0  0  targetWidth  targetHeight    self navigationItem titleView   logoView      How much you pull out the strings and struts  with autolayout  your image will fill the width on navigation bar  So setting only height and content mode is enough   logoView setContentMode UIViewContentModeScaleAspectFit       Autolayout constraints also can not be manipulated since navigation bar has  immutable constraints self navigationItem titleView translatesAutoresizingMaskIntoConstraints   false   NSDictionary metricsArray       width   NSNumber numberWithFloat targetWidth    height   NSNumber numberWithFloat targetHeight    margin   NSNumber numberWithFloat 20    NSDictionary viewsArray       titleView  self navigationItem titleView     self navigationItem titleView addConstraints  NSLayoutConstraint constraintsWithVisualFormat    -  gt margin  -H  titleView width  -  gt margin  -   options NSLayoutFormatAlignAllCenterX metrics metricsArray views viewsArray     self navigationItem titleView addConstraints  NSLayoutConstraint constraintsWithVisualFormat   V  titleView height    options 0 metrics metricsArray views viewsArray     NSLog    f   self navigationItem titleView width         So all we actually need is  UIImage image    UIImage imageNamed   logo    UIImageView logoView     UIImageView alloc  initWithImage image   float targetHeight   self navigationController navigationBar frame size height   logoView setFrame CGRectMake 0  0  0  targetHeight     logoView setContentMode UIViewContentModeScaleAspectFit    self navigationItem titleView   logoView

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Swift 5 If you want to get the navigation bar height  use the maxY property that considers the safeArea size as well  like this   let height   navigationController  navigationBar frame maxY

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Here is the beginning of my response to your update      Why does the content height of my UIWebView not change with rotation     Could it be that because your auto resize doesn t have the autoresizingMask for all directions    Another suggestion before I come back for this  could you use a toolbar for your needs  It s a little simpler  will always be on the bottom  auto-rotates positions  You can hide show it at will etc  Kind of like this  http   cdn artoftheiphone com wp-content uploads 2009 01 yellow-pages-iphone-app-2 jpg  You may have looked at that option  but just throwing it out there    Another idea  could you possibly detect what orientation you are rotating from  and just place the button programmatically to adjust for the tab bar   This is possible with code

User · Answer

The light bulb started to come on   Unfortunately  I have not discovered a uniform way to correct the problem  as described below   I believe that my whole problem centers on my autoresizingMasks   And the reason I have concluded that is the same symptoms exist  with or without a UIWebView   And that symptom is that everything is peachy for Portrait   For Landscape  the bottom-most UIButton pops down behind the TabBar   For example  on one UIView  I have  from top to bottom   UIView     both springs set  default case  and no struts  UIScrollView - If I set the two springs  and clear everything else  like the UIView   then the UIButton intrudes on the object immediately above it  If I clear everything  then UIButton is OK  but the stuff at the very top hides behind the StatusBar Setting only the top strut  the UIButton pops down behind the Tab Bar   UILabel and UIImage next vertically     top strut set  flexible everywhere else  Just to complete the picture for the few that have a UIWebView   UIWebView - Struts  top  left  right Springs  both  UIButton     nothing set  i e   flexible everywhere  Although my light bulb is dim  there appears to be hope

User · Answer

Support iOS 13 and Below  extension UIViewController        var topbarHeight  CGFloat           if  available iOS 13 0                   return  view window  windowScene  statusBarManager  statusBarFrame height    0 0                     self navigationController  navigationBar frame height    0 0            else               let topBarHeight   UIApplication shared statusBarFrame size height                self navigationController  navigationBar frame height    0 0              return topBarHeight

User · Answer

Do something like this        NSLog   Navframe Height  f           self navigationController navigationBar frame size height     The swift version is located here    UPDATE  iOS 13  As the statusBarFrame was deprecated in iOS13 you can use this   extension UIViewController                    Height of status bar   navigation bar  if navigation bar exist               var topbarHeight  CGFloat           return  view window  windowScene  statusBarManager  statusBarFrame height    0 0                 self navigationController  navigationBar frame height    0 0

User · Answer

With iPhone-X  height of top bar  navigation bar   status bar  is changed  increased     Try this if you want exact height of top bar  both navigation bar   status bar    UPDATE  iOS 13  As the statusBarFrame was deprecated in iOS13 you can use this   extension UIViewController                    Height of status bar   navigation bar  if navigation bar exist               var topbarHeight  CGFloat           return  view window  windowScene  statusBarManager  statusBarFrame height    0 0                 self navigationController  navigationBar frame height    0 0              Objective-C  CGFloat topbarHeight     UIApplication sharedApplication  statusBarFrame size height           self navigationController navigationBar frame size height    0 0      Swift 4  let topBarHeight   UIApplication shared statusBarFrame size height            self navigationController  navigationBar frame height    0 0    For ease  try this UIViewController extension  extension UIViewController                    Height of status bar   navigation bar  if navigation bar exist               var topbarHeight  CGFloat           return UIApplication shared statusBarFrame size height                self navigationController  navigationBar frame height    0 0            Swift 3  let topBarHeight   UIApplication sharedApplication   statusBarFrame size height    self navigationController  navigationBar frame height    0 0

[ios] Programmatically get height of navigation bar

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