Ios – Can’t do ANYTHING with navigation bar

iosuinavigationbaruinavigationcontrolleruitabbarcontroller

I have this structure:

storyboard screenshot

When I want to add a ´UINavigationItem´ from the storyboard the navigation bar is "disabled", so I tried to add the right button programatically:

UIBarButtonItem *button = [[UIBarButtonItem alloc]
                           initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
                           target:self
                           action:@selector(showPickerView:)];
self.navigationItem.rightBarButtonItem = button;

But nothing happens. I renamed the navigation bar title from storyboard, but when I run the app the title is not set. I really don't know what is the source of the problem. There is just the back button that is appearing.
Thank you for your help.

Best Answer

Each item in the tab bar controller should have a navigation controller as the root controller (well, you don't need all of them to have a nav controller if you don't need them). What you currently have is a tab bar controller in the navigation controller (unless it's modal) so the view controllers contained in the tab bar controller can't see out to the navigation controller.

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Ios – iPhone hide Navigation Bar only on first page

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.

Objective-c – Adding UIBarButtonItem to UINav..Controller

navigationItem must not be set on the UINavigationController instance but on the view controller of the view which is displayed "inside" the navigation controller.

Setting self.navigationItem on your navigation controller would work if your controller was itself pushed into another navigation controller.

Best Answer

Related Solutions

Ios – iPhone hide Navigation Bar only on first page

Objective-c – Adding UIBarButtonItem to UINav..Controller

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