Show/hide navigationBar when view is pushed/popped in iOS 8

Question

Hi fellow developers,

I'm suprised that I didn't find any information on that particular use case for iOS 8. Let me explain, I have a navigation controller stack, the first view has it's navigationBar hidden, when the user clicks on a cell a new view is pushed and I need the navigation bar shown on this view to go back (obviously). On iOS 7 it was just a matter of adding this line in viewWillAppear :

 [self.navigationController setNavigationBarHidden:NO animated:YES]; 

And it works like a charm. But as of iOS 8 I'm struggling to have the same behavior. For now I managed to do the same by using :

- (void)viewDidLayoutSubviews {     [super viewDidLayoutSubviews];     if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0"))         [self.navigationController setNavigationBarHidden:NO animated:NO]; } - (void)viewDidLoad {      [super viewDidLoad];      if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")) {          self.automaticallyAdjustsScrollViewInsets = NO;          self.edgesForExtendedLayout = UIRectEdgeNone;          self.collectionView.contentInset = UIEdgeInsetsMake(self.navigationController.navigationBar.frame.size.height, 0, 0, 0); }    } 

And changing the contentInset of my collectionsView / tableviews whatever I need to display. It'll work, but it's a real pain in the * (sometimes the content inset isn't necessary if the user comes from a new viewcontroller).

For context the project was first developed to handle iOS 6 and 7, so no storyboard, all is done programmatically. I ported the app to a more modern codebase and made it universal.

Am I missing something ? Is there a better way to handle that in iOS 7/8 ?

Answer 1

You want to hide it in viewWillAppear and show it again in viewWillDisappear

override func viewWillAppear(_ animated: Bool) {     super.viewWillAppear(animated)     navigationController?.navigationBar.isHidden = true }  override func viewWillDisappear(_ animated: Bool) {     super.viewWillDisappear(animated)     navigationController?.navigationBar.isHidden = false }