I have a view controller in a custom UINavigationController (I have only added a CAGradientLayer to the background). The view controller has a collection view with IGListKit in which a cell can present a view that I add as a subview to the navigation controller. Up until there everything works as expected but when I present a new modal view controller by tapping a UIBarButtonItem and close it with
self.dismiss(animated: true, completion: nil)
The navigation controller is suddenly empty and the root view controller that presented it is no longer in the view hierarchy. So I truly have no idea why adding the subviews to the navigation controller is causing this and how I can fix it. Thank you!
Related
I want to make a custom side bar by adding a new view to the view controller, the side bar will be in the yellow color background. I want my side bar also to overlap the navigation bar/item (green background color) in my view controller. but the navigation bar/item seems can't be overlapped by my side bar view, it seems only overlap the main view.
I tried to find the answer in stackoverflow, I find this Overlap navigation bar on ios 6 with other view, but the answer is on the Objective-C, I can't read Objective-C :(
What should I do to overlap navigation bar/item ? here is the screenshot of my view controller
I embed the navigation controller like this
There are plenty of implementations of slide-over or drawer containers.
What you need to do to get above the navigation bar is CONTAIN the navigation controller inside another view controller.
The stack would look like this.
MasterViewController
UINavigationController
RootViewController
Menu
See this one here:
Swift version of MMDrawerController
You can do this by changing your UIViewController hierarchy. For this you'll need three view controllers. First will contain everything, let's call it MasterViewController; second—your main content with navigation bar; and third—drawer.
In MasterViewController instantiate child view controllers and add them to your view controller hierarchy in viewDidLoad().
final class MasterViewController: UIViewController {
override func viewDidLoad() {
let drawerViewController = DrawerViewController()
let mainViewController = MainContentViewController()
let navigationController = UINavigationController(rootViewController: mainViewController)
addChildViewController(drawerViewController)
addChildViewController(navigationController)
view.addSubview(navigationController.view)
view.addSubview(drawerViewController.view)
}
}
Now you have navigationController.view that you can place or animate anywhere within view.
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
In my application, I hide tabbar by setting hidesBottomBarWhenPushed property of UIViewController. I'm not sure this behavior is designed or not, when I called popToRootViewController to pop all view controller stack, tabbar did not show properly if I pushed same view controller after. Even I tried to show tabbar by setting isHidden property after I called popToRootViewController but it didn't work neither. Weird part is, after tabbar disappeared, I pushed same view controller and I could see the tabbar when I tried to pop the view controller (not popToRootViewController) by using gesture to pop (swipe to pop). Though it disappeared when transition was completed.
FYI, this is step by step to produce this behavior.
init tabbar and navigation controllers on two tabs.
push view controller (hidesBottomBarWhenPushed is true) on one tab's navigation controller
pop all view controller from the navigation controller by calling popToRootViewController
4 change tab index by setting selectedIndex on tabbarController
push the same view controller
How does hidesBottomBarWhenPushed property work in detail to show/hide tabbar?
I'll talk about the problem in my app.
For every pages, I'll edit the self.navigationController?.navigationBar.isHidden and self.tabBarController?.tabBar.isHidden = false to guarantee the state of tabBar and navigationBar in the viewWillAppear.
Sample
// In this viewController, I'll show the navigation bar and hide tab bar
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.navigationBar.isHidden = false
self.tabBarController?.tabBar.isHidden = true
}
The navigationBar and tabBar can keep their state from last view controller when you push a new one or pop a old one. So it will let we set in every view controller to control and ensure its state as I wish.
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();
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.