I am presenting a UINavigationController programmatically like this:
let homeViewController = HomeViewController.loadFromNibNamed(nibNamed: "HomeViewController")
let homeNavigationViewController = UINavigationController(rootViewController: homeViewController!)
self.present(homeNavigationViewController, animated: true, completion: nil)
but then in HomeViewController there is a call for self.navigationController!.navigationBar where the navigationController is nil?
Try to print or use self.navigationController?.navigationBar in viewWillAppear().
I think navigationController will be optional.
Related
self.dismiss(animated: false) {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "ViewController") as! ViewController
self.navigationController?.pushViewController(vc, animated: false)
}
self.navigationController will only have a value if your ViewController is embedded in an UINavigationController otherwise it will be nil.
In your case it is nil, so your controller is dismissed successfully but ViewController is not pushed.
In your completion block use self.presentingViewController to push the object.
self.dismiss(animated: false) {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "ViewController") as! ViewController
self.presentingViewController?.navigationController?.pushViewController(vc, animated: false)
}
I am trying to present NavigationController and select second tab in the completion block. My code is:
let chatViewController = UITabBarController()
let navigationController = UINavigationController(rootViewController: chatViewController)
present(navigationController, animated: true, completion: {
self.visibleViewController = navigationController
self.visibleViewController?.tabBarController?.selectedIndex = 1
})
Second attempt:
let chatViewController = UITabBarController()
let navigationController = UINavigationController(rootViewController: chatViewController)
navigationController.tabBarController?.selectedIndex = 1
present(navigationController, animated: true, completion: {
self.visibleViewController = navigationController
})
In both cases tabBarController is nil. How can I switch to different tab?
You are trying to access UITabBarController of UINavigationController, but you need to access the very first controller from UINavigationController and from there you need to make your UITabBar selected like this way:
func showTabBarControllerr() {
let chatViewController = UITabBarController()
//Note: Make sure you have already added the Controllers in Tabbarcontroller
chatViewController.viewControllers = [DemoOne(), DemoTwo()]
let navigationController = UINavigationController(rootViewController: chatViewController)
present(navigationController, animated: true, completion: {
if let tabBarController = navigationController.viewControllers.first as? UITabBarController {
tabBarController.selectedIndex = 1
}
})
}
Let me know this helps or not!
Instead of calling
present(navigationController, animated: true, completion: { })
in viewDidLoad, try to call it in viewWillAppear or viewDidAppear
Try this (Swift 5):
Set an identifier to your UITabBarController in the Storyboard, something like MainTabBar
Into a function or IBAction, use this code:
let tbc = storyboard?.instantiateViewController(withIdentifier: "MainTabBar") as! UITabBarController
tbc.selectedIndex = 1 // This is the index of your controller
present(tbc, animated: false, completion: nil)
I'm running into this issue when I'm opening a new View Controller programmatically.
let controller = self.storyboard?.instantiateViewController(withIdentifier: "overViewScreen") as! OverviewViewController
controller.user = self.userObject
let navigationController = UINavigationController(rootViewController: controller)
self.present(navigationController, animated: true, completion: nil)
The structure of my project :
storyboard
On my storyboard the tab bar is shown onto the View Controller (with the table on the right), but when I run the app it looks like this :
enter image description here
I hope you guys can help me out!
Thank you.
You are presenting NavigationController without tab bar controller. You need to present TabBarController.
Give your TabBarController identifier and instantiate them just like you've done with controller
code from comment:
let tabVC = UIStoryboard(name: "NameOfYourStoryboard", bundle: Bundle.main).instantiateInitialViewController() as! UITabBarController
let navVc = tabVC.viewControllers.first as! UINavigationController
let vc = navVc.viewControllers.first as! OverviewViewController
vc.incorrectAuthorization = SettingsAuthorizationMethod.fingerprint
vc.user = self.userObject
present(navController, animated: true, completion: nil)
Ok, I managed to fix it like this :
let vc = self.storyboard?.instantiateViewController(withIdentifier: "TabBarController") as! TabBarController
vc.user = self.userObject
let nvc = UINavigationController(rootViewController: vc)
self.present(nvc, animated: true, completion: nil)
I made a seperate controller class "TabBarController", and added a property "user" to this class. In my "OverViewController" I can get the property as follows :
let tabBar: TabBarController = tabBarController as! TabBarController
user = tabBar.user
Thanks for the help!
I want to segue from AppDelegate to First View of UITabBarController.
I assigned StoryBoardID of UITabBarController as "HomePage".
and I tried below code:
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController: UITabBarController = storyboard.instantiateViewControllerWithIdentifier("HomePage") as! UITabBarController
let rootViewController = self.window!.rootViewController as! UINavigationController
rootViewController.pushViewController(viewController, animated: true)
It works but I gave BackBarButton on destination view which I don't want.
I want to segue Presently.
You need to set your viewControllers instead of pushViewController
rootViewController.viewControllers = [viewController]
Instead of
rootViewController.pushViewController(viewController, animated: true)
I have two ViewControllers -- one with storyboard and one without. Both of those view controllers have their own Navigation Bar at the top. Now when I use self.presentViewController(editorViewController, animated: true, completion: nil) my editorViewController comes up but without its Navigation bar.
Any ideas how to fix this?
I fixed the problem using the following code:
let editorViewController = IMGLYMainEditorViewController()
let navEditorViewController: UINavigationController = UINavigationController(rootViewController: editorViewController)
self.presentViewController(navEditorViewController, animated: true, completion: nil)
I just added the navEditorViewController as it made my navigation bar with its items to appear.
Try self.navigationController!.pushViewController(...)
Swift 5+
let destinationNavigationController = self.storyboard!.instantiateViewController(withIdentifier: "nav") as! UINavigationController
destinationNavigationController.modalPresentationStyle = .fullScreen
self.present(destinationNavigationController, animated: true, completion: nil)
Here your navigation bar replaces with new navigation bar.
So for everyone still curious about this problem, given that we already have existing UINavigationController other than the current one:
Swift 3
First, we need to find the UIViewController that we want to present:
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let destinationViewController = storyboard.instantiateViewController(withIdentifier: "DestinationViewController") as! DestinationViewController
Next, we're doing the same thing for UINavigationController:
let destinationNavigationController = storyboard.instantiateViewController(withIdentifier: "DestinationNavigationController") as! UINavigationController
Then, we want to bring the DestinationViewController to the top of our destination UINavigationController stack:
destinationNavigationController.pushViewController(destinationViewController, animated: true)
Finally, just present destination UINavigationController:
self.present(destinationNavigationController, animated: true, completion: nil)