I'm curious, in my experience you set the UINavigationItem and then set the title, bar buttons, etc. but UINavigationBar allows you to set an array of these items, why would you want to do this? What benefit would multiple bring?
It's very common when you have a UINavigationController and you push two or more view controllers onto the nav stack. This pushes multiple navigation items on to the nav bar. This is what allows the back button to be titled based on the previous view controller's title.
If you simply add a nav bar to a view then it is unlikely you would have more than one nav item on the nav bar.
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So I have a UITabBarController and it has three buttons on the bottom in my iOS app. I want to add another set of buttons at the top but not quite sure on how to do this. I tried adding a UINavigationBar and a navigation button, and adding a view in to it, adding just the buttons, ect.... but to no avail. It won't let me add anything to the UITabBarController. Is there a way to do this?
Thank you very much.
the simplest way to that is to creat 3 buttons side by side and set their frame the way they divide the top of screen to 3 equals. it means u can create a tab bar with buttons manually.
but there's another way. i think this answer would help u
Positioning UITabBar at the top
To use the navigation bar you need a navigation controller. Now depending on your needs your tab bar controller should be inside a navigation controller or the other way around. If you want to be able to navigate away from the tab bar controller (have a screen without the tab bar) you should embed your tab bar controller into a navigation controller. If you only need the navigation bar for some tabs of the tab bar controller or you still want the tab bar to be visible all the time you should embed all (or just the ones than need a navigation bar) your root view controllers for each tab in navigation controllers. Finally if you do not need the navigation behaviour you could just put a regular view in the view controller that needs the bar at the top and some buttons in it and make them look the way you want.
You can embed a view controller in a navigation controller in a storyboard by selecting the view controller and the going to Edit->Embed in->Navigation controller.
Select the Any Tabbar ViewController then above the Menu -> Editor -> Embed In -> Navigation Controller its select, if you get the Navigation Controller then if you add the Navigation Button at Top of the ViewController, example :
I am confused about the relationship of navigation controller and content view controllers. In storyboard, navigation bar is under the navigation controller, so I linked it to the NavigationController class and then customized the navigation bar in the viewDidLoad function. However, since different content views will have different navigation bar, like different bar buttons, how can I realize this? Just some basic ideas are good enough. My guess is that I need to specify specific bar buttons in specific content view controllers, but since the navigationBar property is in NavigationController class, how can I refer to it?
I want to hide the title of the navigation bar and make the bar only show some custom buttons (I know toolbar may match it better, but I have other reasons to adopt navigation bar). Please tell me how to hide the title in detail and swift language is preferred.
1) Every ViewController instance has a navigationController property, it' just an optional. To set the bar buttons, you'll want to use navigationItem. So to specify bar buttons you either do so in Interface builder per view controller, or just or do something like this in viewDidLoad
let navBarButton = UIBarButtonItem()...set up bar button
self.navigationItem?.leftBarButtonItem = navBarButton
2) Hiding the title is trivial:
self.navigationItem?.title = ""
I need some help figuring out the anatomy of my app.
What I need is a tab bar that also have a top navigation bar. And then each view controller within the tab bar will need to have buttons that can transition in new views within this tab. Does that make sense?
So my question is, how should I set this up. Should it be a main tabarviewcontroller and then each view has a separate nagivationcontroller? Or should it be a navigation controller that has the tab bar as a root. And then just use that navigation controller to do any transitions within the viewcontroller?
Thanks!
Your main view can be a UITabBarController, and you can add your UINavigationControllers to the tab bar viewControllers array. Each navigation controller will have a separate navigation bar and function independently. Clicking on a tab will switch to the appropriate navigation controller.
I have a requirement to implement an app that has a navigation bar like bar at the top of numerous screens.
It has an icon on the left, some text, and some buttons on the right thus these would map well to a navigation item's left bar button items, title view, and right bar button icons.
However on most of the screens the content of the bar remains the same - i.e. a back button and title change would only appear occasionally for some screens, and on others the navigation bar would be present but is not actually used for navigational purposes.
Is the best of implementing this to configure a UINavigationItem, if so as there are multiple screens and multiple view controllers is there anyway the same UINavigationItem can be shared? That way I can configure the UINavigationItem in the RVC and keep it there as different view controllers get pushed, replacing it where need be when a back button does actually need to appear?
If this isn't the best approach then what alternatives are there? I experimented with making my RVC a container view controller and adding the bar as a view of that, that works for the immediate child view controllers but not for grandchild view controllers (which would take up the entire screen and not the portion alloted to them by the container view).
The navigationItem in UIViewController is readonly, so you can't have a single shared UINavigationItem shared between view controllers. You could have a base view controller class that manages setting the navigation item that you derive all of your view controllers from. To keep your classes from getting too coupled you could have it update the contents of the navigationItem from a NSNotification. Then you can just post a notification when you need all of the navigation items to be updated.
In my iOS application I have a tab bar view with three views. I would like each of those views to have a "navigation" bar at the top. I would like the navigation bar to have a left bar button item which has the same functionality across all three views, and then a right bar button item which is unique to each view. How should I build this?
In each tab, put a UINavigationController. That's a separate one for each tab.
Set the root view controller of each navigation controller to a view controller that manages the content view you want to display.
You can set the left button item of each of the three navigation controllers to the same thing, and set the right button item to something different.