Apple's documentation on UINavigationItem states the following:
The managing UINavigationController object uses the navigation items
of the topmost two view controllers to populate the navigation bar
with content.
Why the topmost two view controllers instead of just the topmost? Is it just so that when you pop the view controller, it fades one item out and another in?
I think it's because the title of the "Back" button is (by default) the navigation title of the view controller just underneath the top one.
Navigation title: Title of top view controller.
Back Button title: Title of previous view controller.
Related
I'm pretty new to iOS development and I'm having some trouble with navigation controller and a collection view as a Subview.
Ive started my project with a single view application and embedded in a Navigation controller (The Navigation controller root is my ViewController).
Inside my view controller i've added a Collection view with a custom cell (it doesn't take the whole screen).
when I run my application everything works fine.
when I tried to set the method
navigationController?.hidesBarsOnSwipe = true
nothing happens inside my Collection view even though I'm scrolling, but if I swipe within the View controller and not the Collection view the method works and the Navigation bar gets hidden just fine.
I want the method to work when I swipe inside the Collection view.
Thank...
If your collection view top is set to the top layout guide top then the view behind is has never scrolled, i.e. your view isn't scrolling so the navigation bar is not hiding.
Try setting your collection view top to the "Top Layout Guide.Top". Try changing this to "Superview.Top".
I'm setting up a Menu and Menu Items in Storyboard, and want one menu item to toggle between two states e.g. on/off, Celcius/Fahrenheit, etc.
However, control-dragging from a menu item to the interface controller doesn't let me create an outlet, but only has option to create an action. So although I can set up an action to toggle between two states, I'm not being able to change its title and image to show the current button state.
Is there a way to implement this correctly in WatchKit?
Yes, you can do it this way - whenever you want to toggle your state - clear menu items:
[self clearAllMenuItems];
and then set up new menu items:
[self addMenuItemWithImageNamed:#"myImage" title:#"action title" action:#selector(actionMethod)];
I have the navigationcontroller based viewcontroller and I overriding the root view controller navigation bar back button in to my custom segment control with different purpose. This navigation controller is placed one of the separate tab in the uitabbarcontroller. If this is used as the separate tab bar then no problem.
But if i use this navigationcontroller inside the more option in tabbarcontroller i am not able to come back to the more option list because of backbutton is overridden in my navigationcontroller.
My idea is add one back button only if my navigationcontroller is used more option tab otherwise i need to hidden the back button.
Please help me in this issue?
You can check if a view controller is in the 'more' section as follows:
BOOL isOnMoreNavigationController = [tabBarController.moreNavigationController.viewControllers containsObject:myViewController.navigationController];
From a UI consistency perspective it might be better to always show the back button in its standard position and move your custom buttons to some other place.
I have a navigation controller with a root view controller for which i have the customised titleView instead of normal title for the navigation item.
If i pushed a new controller in it , the default back button title is "back", Since i have used custome titleView.
I want it to be different. I tried by setting the title in backbaritem of the root view controller, but no use.
I can create a bar button item in my pushed controller and i can set it as leftbar item, But i want it like a normal back button. [Pointing towards backward]
Is it possible to set title for the back button , if i have a custom titleView ?
Is it possible to create a bar button item as like as default back button.[Pointing towards back , other than plain,border...etc] ?
Regards,
Balaji R.
I got it.
Even though i have custom titleView for my navigation item, I can still set the title for the same navigation item where it wont be taken for the title display in navigation item . but it will taken as the title of the back button when some other controllers are pushed into it.
So , Now i'm having both title [Used for back title display] and titleView [custom view] in the navigation item.
Thanks,
Balaji R.
I have a UINavigationController with toolbarHidden set to NO.
I have added UIBarButtonItems to navigationController.toolbar.
The toolbar is displayed, but the buttons are not...
What gives?
Ok so apparently I misunderstood the usage of the setItems method on navigationController.
To remedy this I set the toolbar items on each view controller that is pushed onto the navigation controller's stack.
I guess if I wanted to have one toolbar persist through all the views I could add a new toolbar to the view controller holding my navigation controller then simply invoke setItems on my navigation controller.
I digress.