I am opening new viewcontroller like
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let view_controller1 = storyBoard.instantiateViewController(withIdentifier: "incident_view_id") as! IncidentViewController
let appDelegate = UIApplication.shared.delegate as! AppDelegate
//self.present(registerViewController, animated: true)
let navigationController = UINavigationController.init(rootViewController: view_controller1)
appDelegate.window?.rootViewController = navigationController
Which works fine,
Now when I press a button I need to close current view and go back previous view, I tired
self.navigationController?.popToRootViewController(animated: true)
But not works, I tried this too
self.view.window!.rootViewController?.dismiss(animated: true, completion: nil)
But same result.
You are presenting your ViewController in a wrong way. The following line tells the application to no matter what ViewControllers you have opened, just throw it out and assign the UINavigationController what you are creating, as the rootViewController. So the reason your code, the dismiss, is not working because there are no other ViewControllers behind your current one.
appDelegate.window?.rootViewController = navigationController // Wrong
This usually goes into the beginning of the applications, where you define with which UIViewController you want to start your application. I believe you are calling the first code chunk you posted from a UIViewController. So what you need to do instead of creating a new UINavigationController and assigning it to the rootViewController, you just use the UIViewControllers navigation controller to push the next UIViewController.
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let view_controller1 = storyBoard.instantiateViewController(withIdentifier: "incident_view_id") as! IncidentViewController
navigationController?.pushViewController(view_controller1, animated: true)
I am running an XCTest where I am trying to instantiate a UINavigationController as the initialViewController but it is giving me the following error:
Could not cast value of type 'ToDo.ItemListViewController'
(0x10cce7208) to 'UINavigationController' (0x10f93ced8)
The ItemListViewController is embedded within the Navigation Controller, and "Is Initial View Controller" is selected for the Navigation Controller. This is exactly how I'm instructed to do this by a tutorial... perhaps I have another setting interfering? Here is my code
func test_InitialViewController_IsItemListViewController() {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let navigationController =
storyboard.instantiateInitialViewController() as! UINavigationController
let rootViewController = navigationController.viewControllers[0]
XCTAssertTrue(rootViewController is ItemListViewController)
}
Screenshot for reference:
I want to create a Welcome & Guide page for an iOS app. I am using Swift 3. My problem is that when I try to show the Main.storyboard after finishing the Guide instructions, I get a black view instead of the Main.storyboard:
I use window?.rootViewController = ViewController()in AppDelegate.swift to switch a new ViewController which is linked with the Main.storyboard. But I get nothing except a black view.
If you have used storyboard then you will have to fetch your view controller as
let viewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "your_identifier_which_you_have_set_in_storyboard")
window?.rootViewController = viewController
If your viewController is embedded in UINavigationController then just make this change:
window?.rootViewController = UINavigationController(rootViewController: viewController)
try this one.
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "MainVC")
window?.rootViewController = UINavigationController(rootViewController: viewController)
I'm using following code to programmatically navigate to another ViewController. It works fine, but it some how hides the navigation bar. How do I fix this? (the navigation bar is created by embeding the ViewController in the navigation controller if that matters.)
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let nextViewController = storyBoard.instantiateViewControllerWithIdentifier("nextView") as NextViewController
self.presentViewController(nextViewController, animated:true, completion:nil)
Swift 5
The default modal presentation style is a card. This shows the previous view controller at the top and allows the user to swipe away the presented view controller.
To retain the old style you need to modify the view controller you will be presenting like this:
newViewController.modalPresentationStyle = .fullScreen
This is the same for both programmatically created and storyboard created controllers.
Swift 3
With a programmatically created Controller
If you want to navigate to Controller created Programmatically, then do this:
let newViewController = NewViewController()
self.navigationController?.pushViewController(newViewController, animated: true)
With a StoryBoard created Controller
If you want to navigate to Controller on StoryBoard with Identifier "newViewController", then do this:
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let newViewController = storyBoard.instantiateViewController(withIdentifier: "newViewController") as! NewViewController
self.present(newViewController, animated: true, completion: nil)
SWIFT 4.x
The Strings in double quotes always confuse me, so I think answer to this question needs some graphical presentation to clear this out.
For a banking app, I have a LoginViewController and a BalanceViewController. Each have their respective screens.
The app starts and shows the Login screen. When login is successful, app opens the Balance screen.
Here is how it looks:
The login success is handled like this:
let storyBoard: UIStoryboard = UIStoryboard(name: "Balance", bundle: nil)
let balanceViewController = storyBoard.instantiateViewController(withIdentifier: "balance") as! BalanceViewController
self.present(balanceViewController, animated: true, completion: nil)
As you can see, the storyboard ID 'balance' in small letters is what goes in the second line of the code, and this is the ID which is defined in the storyboard settings, as in the attached screenshot.
The term 'Balance' with capital 'B' is the name of the storyboard file, which is used in the first line of the code.
We know that using hard coded Strings in code is a very bad practice, but somehow in iOS development it has become a common practice, and Xcode doesn't even warn about them.
You should push the new viewcontroller by using current navigation controller, not present.
self.navigationController.pushViewController(nextViewController, animated: true)
According to #jaiswal Rajan in his answer. You can do a pushViewController like this:
let storyBoard: UIStoryboard = UIStoryboard(name: "NewBotStoryboard", bundle: nil)
let newViewController = storyBoard.instantiateViewController(withIdentifier: "NewViewController") as! NewViewController
self.navigationController?.pushViewController(newViewController, animated: true)
So If you present a view controller it will not show in navigation controller. It will just take complete screen. For this case you have to create another navigation controller and add your nextViewController as root for this and present this new navigationController.
Another way is to just push the view controller.
self.presentViewController(nextViewController, animated:true, completion:nil)
For more info check Apple documentation:-
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewController_Class/#//apple_ref/doc/uid/TP40006926-CH3-SW96
OperationQueue.main.addOperation {
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let newViewController = storyBoard.instantiateViewController(withIdentifier: "Storyboard ID") as! NewViewController
self.present(newViewController, animated: true, completion: nil)
}
It worked for me when I put the code inside of the OperationQueue.main.addOperation, that will execute in the main thread for me.
All other answers sounds good, I would like to cover my case, where I had to make an animated LaunchScreen, then after 3 to 4 seconds of animation the next task was to move to Home screen. I tried segues, but that created problem for destination view. So at the end I accessed AppDelegates's Window property and I assigned a new NavigationController screen to it,
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let homeVC = storyboard.instantiateViewController(withIdentifier: "HomePageViewController") as! HomePageViewController
//Below's navigationController is useful if u want NavigationController in the destination View
let navigationController = UINavigationController(rootViewController: homeVC)
appDelegate.window!.rootViewController = navigationController
If incase, u don't want navigationController in the destination view then just assign as,
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let homeVC = storyboard.instantiateViewController(withIdentifier: "HomePageViewController") as! HomePageViewController
appDelegate.window!.rootViewController = homeVC
The above code works well but if you want to navigate from an NSObject class, where you can not use self.present:
let storyBoard = UIStoryboard(name:"Main", bundle: nil)
if let conVC = storyBoard.instantiateViewController(withIdentifier: "SoundViewController") as? SoundViewController,
let navController = UIApplication.shared.keyWindow?.rootViewController as? UINavigationController {
navController.pushViewController(conVC, animated: true)
}
I have been trying to figure this out by myself, but couldn't.
I want to load a Tab Bar controller from my AppDelegate (After a successful Google Sign in to the application).
I read here how to load a ViewController from AppDelegate
Perform Segue from App Delegate swift
Code in the example:
// Access the storyboard and fetch an instance of the view controller
let storyboard = UIStoryboard(name: "Main", bundle: nil);
let viewController: MainViewController = storyboard.instantiateViewController(withIdentifier: "ViewController") as! MainViewController;
// Then push that view controller onto the navigation stack
let rootViewController = self.window!.rootViewController as! UINavigationController;
rootViewController.pushViewController(viewController, animated: true);
In this example, my TabBar needs both a name and identifier, from what I understood.
Can someone please explain this to me ? I can't find "identifier" on the Tab Bar Controller , only "Title".
Also, I don't have a navigation controller view in my app.
set storyboard ID here
and embed the firstViewController in IB in navigationController
let rootViewController = self.window!.rootViewController as! UINavigationController;
rootViewController.pushViewController(viewController, animated: true);
iOS 13 Update
From version. iOS 13,
The RootViewController will be initiated in scene function located at
SceneDelegate.swift instead of AppDelegate.swift file. which looks like this.
Example:
// Simple init
let mainSB: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let loggedInTabController = mainSB.instantiateViewController(identifier: "loggedInTabController")
self.window!.rootViewController = loggedInTabController