A UITabBarController is being pushed onto the stack:
let presenter = presentingViewController as! UINavigationController
let tabvc = UITabBarController()
tabvc.viewControllers = vcs
tabvc.customizableViewControllers = vcs
presenter.pushViewController(tabvc, animated: true)
Once presented the more tab button correctly shows, but the edit button to rearrange the tab bars does not. According to the docs on the MoreNavigationController:
The interface for the standard More item includes an Edit button that
allows the user to reconfigure the tab bar. By default, the user is
allowed to rearrange all items on the tab bar. If you do not want the
user to modify some items, though, you can remove the appropriate view
controllers from the array in the customizableViewControllers
property.
My guess is that the tab bar is not happy being in a navigation controller. Any ideas on bringing the edit button back?
You can have both a UINavigationController and a UITabBarController ; using Storyboard helps understand the issue better, any of these solutions will work:
Start out with a UITabBarController as initial view controller
Use presentViewController instead of pushViewController
Use a modal Storyboard segue to perform a modal presentation
Swap out the rootViewController dynamically
Initial View Controller Design
When the Tab Bar Controller is initial View Controller, the Edit button is displayed normally.
Pushed Design
Another Navigation Controller is initial View Controller, using one of 5 adaptive Action Segue:
Show
Custom
-> No Edit button, since it is in direct conflict with the parent UITableViewController.
Show Detail
Present Modally
Popover Presentation
-> Edit button displayed as expected.
Code
1. Program Modal
Using the exact code presented in the question, change the last line:
let presenter = presentingViewController as! UINavigationController
let tabvc = UITabBarController()
tabvc.viewControllers = vcs
tabvc.customizableViewControllers = vcs
presenter.presentViewController(tabvc, animated: true, completion: nil)
2. Storyboard Modal
keeping with the Storyboard theme, create a segue of the correct type, assign an identifier (i.e. presentModallySegue) and the 5 lines above become this single line:
self.performSegueWithIdentifier("presentModallySegue", sender: self)
3. root Swap
A more drastic solution involves swapping out the root view controller at the window level:
let tabvc = UITabBarController()
tabvc.viewControllers = vcs
tabvc.customizableViewControllers = vcs
self.view.window!.rootViewController = tabvc
Conclusion
Either change your design to adopt the Tab Bar Controller as the initial View Controller, or present the Tab Bar Controller modally.
The reason is that navigation bar of your presenter overlaps with the navigation bar of More section.
If you don't show the navigation bar for you navigation controller, you will be able to see the Edit button again when you tap on the More tab.
Related
I have a viewController that is embedded in a nav controller. This nav controller is then embedded in a tab bar controller.
I have another viewController that is not supposed to be accessible from the tabBarController. It should only be accessible from the first viewController using a button. From the secondViewController, I made a UIBarButtonItem to move back to the original view. From the first view to the second view and vice versa, I used a Storyboard reference to move to and from from the views.
However, when I move from the first view to the second view, the tab bar controller disappears (like it should). When I move back to the first view, the tab bar controller disappears and I cannot move between tabs anymore.
I tried including:
self.hidesBottomBarWhenPushed = false
on the first view and
self.hidesBottomBarWhenPushed = true
on the second view
and nothing seems to work. The tab bar controller disappears every time i move from the second view to the first view.
You are following a wrong hierarchy. You are actually using seagues to go back and forth. This creates a new instance every time you try to come back to the first controller.
Let's make it clear:
You need to follow the below approach:
1 You have two controllers A and B.
2 Use self.hidesBottomBarWhenPushed = true in viewDidLoad or viewWillAppear of controller A.
3 Controller A is embedded in a navigation controller which is further embedded in a UITabBarController.
Tapping a button in controller A, you need to push to controller B. So you can use segue for this or you can do it programatically like:
let controllerB = B()
A.navigationController?.pushViewController(controllerB, animated: true)
4 Go Back to Controller A on the tap UIBarButtonItem. So your code in the action of UIBarButtonItem should be something like:
self.navigationController?.popViewController(animated: true)
Remember you should not should segue to go back to the previous controller.
you should use
override func viewWillDisappear(_ animated: Bool) {
self.tabBarController?.tabBar.isHidden = false
}
in that controller where the back button is placed, I am using the exact scenario in one of the my app.
Ok, I have an issue that I cant understand trying to present a view controller (the same instance every time, just like other tab item VCs) from an overall tab bar controller VC. My tab bar controller VC has 3 view controllers that it is connected to via storyboard, so 3 tab bar items appear on the tab bar. When the selectedIndex is changed, these view controllers just appear right there below the subviews of the Tab Bar Controller VC.
These subviews that should always be on top are the nav bar at the top and tab bar at bottom:
And this is great for those 3 view controllers. Problem is I need to access 1 instance of ANOTHER view controller that is NOT shown in the tab bar buttons via a button in the nav bar here.
My problem is no matter how I present it, this VC always pops OVER the tab bar controller VC, covering the tab bar and nav bar.
here I make sure only 1 instance is made:
if podcastVC == nil {
//print("IT IS NIL")
let storyboard = UIStoryboard(name: "Main", bundle: nil)
podcastVC = storyboard.instantiateViewController(withIdentifier: "podcast") as! PodcastViewController
//*NOTE: have to set other vars too, this is temp
podcastVC.urlStr = currentTrackUrl!
podcastVC.originalUrl = currentTrackUrl!
AudioPlayerManager.shared.play(urlString: podcastVC.urlStr)
}
self.show(podcastVC, sender: self)
podcastVC.modalPresentationStyle = .currentContext
podcastVC.definesPresentationContext = false
[1]: https://i.stack.imgur.com/1d6MZ.png
as shown by Swift: How to return to the same instance of my UIViewController
How can I make that VC present in the same context as the tab bar items? I have tried setting the layer of the nav bar to a z position much higher (like 10) but nothing works. What is wrong?
Modal view :
Can works for all view controllers
Is over all other view and need to be pop programatically (adding a button back manually for example)
Push View :
Only works in navigation controllers
Add automatically a back button in the navigationController
you should push VC and it will keep tabbar and nav
you can change modal present style
I have one common tab bar view controller.And i have connected 3 other view controllers with navigation bar and i connect this 3 view controllers with the main tab bar view controller.So now i have 3 tab bar items with 3 view controller.
that is 1.Home 2. Cart 3. feedback
This is fine !!
And now my first view controller(That is my first tab bar view controller) have some table view data and with detail view controller.And in my detail view controller i have one button called "Go to cart".
So the actual flows is when user press Go to cart.It have to move to cart` view controller.Now its moving.
But the problem is .I was not able to see my tab bar items and other items .But if i go normal to each tab bar items its showing all tab bar items.
When i go from my Detail view button click to my Cart tab bar view controller..Then no tab bar items are showing down.
I did all this like demo prototype.Like i drag from button to cart tab bar view controller navigation bar.
But its not showing tab bar why.Please help me out.I don't have any single solution to solve this.I am using swift 2.2.
Thanks.
Updated :
So i need to code some thing like this Right?.But i don't know how to handle this code:
let barViewControllers = sender.destinationViewController as! UITabBarController
let nav = barViewControllers.viewControllers![1] as! UINavigationController
let destinationViewController = nav.topViewController as! CartVC
But i am getting crash in first line :
fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
Please help me out
Here is storyboard similar to yours.
Now remove segue from button "go to cart" which is similar to "show second tab" button in my storyboard
Instead provide action to it as follows,
#IBAction func showSecondTab(sender: AnyObject) {
let navController = self.tabBarController?.viewControllers![1] as! UINavigationController
///secondviewcontroller in your case is cart
let secondViewController = navController.viewControllers[0] as! SecondViewController
//set values you want to pass
//lets say I want to pass name to secondVC
secondViewController.name = "ABCD"
self.tabBarController?.selectedIndex = 1
}
you can print and check values in viewDidLoad of secondVC(CartVC).
I noticed in Whatsapp there are four tabs. If you disable the access to Contacts, the view in first tab, Favorites, will be replaced with the information view which will guide user to open the Settings.
I was trying to copy this function with following codes (in AppDelegate):
let gotoSettingsVC = UIApplication.sharedApplication().keyWindow?.rootViewController!.storyboard?.instantiateViewControllerWithIdentifier("gotoSettingsViewController") as! GotoSettingsViewController
let tabbarController = UIApplication.sharedApplication().keyWindow?.rootViewController! as! UITabBarController
gotoSettingsVC.tabBarItem = tabbarController.tabBar.selectedItem
tabbarController.viewControllers![tabbarController.selectedIndex] = gotoSettingsVC
The gotoSettingsVC can be shown correct but without Navigation Bar. How to show this View with a Navigation Bar like the normal View in tabbarController?
thank you for any help.
Embed the GotoSettingsViewController in a navigation controller, and set that as one of the tabBar controllers view controller.
I'm making an app for iOS based partly on storyboards and programmatically setup. The root view controller (1) is a has a scroll view. In it is two view controllers (2 and 3), and they have further navigation deeper into the app. I want it to be able to make the edge swipe from left to navigate back. When I make the first view controller and "Embed in Navigation Controller" through the Interface Builder, it dosn't enable the back swipe.
Maybe it's because I add view controller 2 and 3 to view controller 1 programmatically? But it dosn't work either if I embed view controller 3 in a navigation controller, eventhoug I have connected everything from there on via segues.
View controller 1, 3 and 5 have scrollviews embedded, maybe the swipe functions of the scrollview overrides the swipe back function?
The view controllers 2 and 3 are embedded in view controller 1 like this:
scrollView.addSubview(ViewControllerThree.view)
I havn't tried to make the navigation controller programmatically, if that posible.
Any ideas?
EDIT
I've tried doing it programmatically like this:
I add the following code to app delegate application_didFinishLaunchingWithOptions, and remove the navigation controller from my storyboard. But I have the same problem, it seems that when I seque away from view controller 2 or 3, I loose the navigation controller.
var storyboard = UIStoryboard(name: "Main", bundle: nil)
var viewController = storyboard.instantiateViewControllerWithIdentifier("New Landing Page")
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
var nav = UINavigationController(rootViewController: viewController)
self.window?.rootViewController = nav;
self.window?.makeKeyAndVisible();