I know, there are a lot of similar threads but I'm still struggling to get this problem solved.
I want to instantiate a certain viewcontroller in AppDelegate (only if a user is not logged in). But even without an authentication check my code in app delegate to instantiate my login controller seems to be ignored:
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
let loginController = UIStoryboard(name: "Main", bundle: .main).instantiateViewController(withIdentifier: "loginController") as! LoginController
self.window!.rootViewController = loginController
self.window!.makeKeyAndVisible()
return true
}
}
No matter which view controller I instantiate in app delegate, the initial view controller set in storyboard appears when launching my app. (Note: if no view controller is set as initial in storyboard, the app is launching with a black screen).
What's my mistake?
Thanks a lot in advance
Alex
You can try this code in didFinishLaunchingWithOptions method --
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let initialVC: ViewController = mainStoryboard.instantiateViewController(withIdentifier: "ViewController") as! ViewController
let navigationController = UINavigationController(rootViewController: initialVC)
navigationController.isNavigationBarHidden = true
self.window?.rootViewController = navigationController self.window?.makeKeyAndVisible()
In a modern iOS app, the app delegate has no window. You can create one but it will be replaced. The visible window belongs to the scene delegate. You need to create the interface using scene delegate code.
Related
Now I am implementing onesignal notification, when user click on notification I want to open specific Viewcontroller.
Here is my code at AppDelegate
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let detailBrand = storyBoard.instantiateViewController(withIdentifier: "PagerOverviewControlerID") as! PagerOverviewControler
detailBrand.getValue = value
navigationController?.pushViewController(detailBrand, animated: true)
This code is working fine if I put it in any ViewController Class but inside AppDelegate it doesn't.
Please help!!!
Well, first you have to understand that the Appdelgate is not a UIViewController,
therefore you can't use pushViewController(detailBrand, animated: true) because you are not exactly in a UIVewController to be able to do so, But Instead you can initiate a UINavigatetionController set it as your root then push from it.
and your code should be something like this
let rootViewController = self.window!.rootViewController as! UINavigationController
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let profileViewController = mainStoryboard.instantiateViewController(withIdentifier: "PagerOverviewControlerID") as! PagerOverviewControler
rootViewController.pushViewController(profileViewController, animated: true)
Also keep in mind you should place it inside the didFinishLaunchWithOption method.
func application(_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool
I have created TableViewController by xib not on storyboard. I have view controller which loads by default. Now I want that TableViewController as root controller. Thanks in advance.
1 first register you xib in particular viewController in which you want to load.
by register.nibLod
2 then in AppDelegate in - didFinish method make your that particular viewController as rootviewcontroller.
You can do like this.
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
let navigationController: UINavigationController = UINavigationController(rootViewController: YourViewController()) //where YourViewController is name of viewController which you want to use as rootViewController
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()
return true
}
I am setting up a MainViewController holding multiple ViewControllers the following way:
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
let pageController = UIPageViewController(
transitionStyle: UIPageViewControllerTransitionStyle.scroll,
navigationOrientation: UIPageViewControllerNavigationOrientation.horizontal,
options: nil
)
let navigationController = MainViewController(rootViewController: pageController)
navigationController.view.backgroundColor = UIColor.white
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let leftView = storyboard.instantiateViewController(withIdentifier: "VC1")
let middleView = storyboard.instantiateViewController(withIdentifier: "VC2")
let rightView = storyboard.instantiateViewController(withIdentifier: "VC3")
navigationController.viewControllerArray = [leftView, middleView, rightView]
self.window!.rootViewController = navigationController
self.window!.makeKeyAndVisible()
return true
}
}
My MainViewController also has what is supposed to be a floating button. I have aded this in the storyboard (see picture below). The problem is that the button is not showing. How do i make it show?
I know that somehow this problem is related to the fact that I adding MainViewController in the AppDelegate, but I am not sure how that is hiding the buttons.
You aren't creating your MainViewController instance from the storyboard, you are just creating it with a call to its initialiser. This means that none of your storyboard elements will be loaded
You need something like:
let navigationController = storyboard.instantiateViewController(withIdentifier: "Main")
navigationController.viewControllers = [pageController]
Why when I create navigation controller with empty view controller I receive strange behaviour with navigation bar?
This is how I create navigation controller.
init(
window: UIWindow,
keystore: Keystore,
navigationController: UINavigationController = UINavigationController()
) {
self.navigationController = navigationController
self.keystore = keystore
super.init()
window.rootViewController = navigationController
window.makeKeyAndVisible()
}
Than I simply do :
func start() {
let x = UIViewController()
x.view.backgroundColor = UIColor.red
navigationController.setViewControllers([x], animated: true)
}
And I receive:
But in the next app launches all is fine.
This might be the case, because you set the NavigationController after the app has already started.
I would recommend to set the NavigationController in your AppDelegate.
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
let firstViewController = UIViewController()
let navigationController = UINavigationController(rootViewController: firstViewController)
window?.rootViewController = navigationController
window?.makeKeyAndVisible()
return true
}
}
Hi I have made a ViewController.
But I don't know how to add very first view right after an app is tapped.
I added below codes in ViewController.swift
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let controller = storyboard.instantiateViewController(withIdentifier: "FirstViewController")
self.present(controller, animated: true, completion: nil)
the FirstViewController appears after the app tapped and shows white background for about a second.
When you first launch your app, the LaunchScreen.storyboard is displayed, as a transition while your app is loading. You can customise this in Interface Builder.
check the option 'is initial view Controller' for that firstViewController from the storyboard.
You can set initial view controller programmatically or via storyboard
Method 1:programmatically--
Set storyboard-identifire for Viewcontroller in Main.storyboard file
like
After that set rootviewController in Appdelegate class.
import UIKit
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
let redViewController = mainStoryBoard.instantiateViewController(withIdentifier: "ViewController") as! ViewController
window?.rootViewController = redViewController
window?.makeKeyAndVisible()
return true
}
}
For setting up with navigation controller use UINavigationController -
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
let viewController = mainStoryBoard.instantiateViewController(withIdentifier: "viewController") as! viewController
let navigationController = UINavigationController(rootViewController: viewController)
window?.rootViewController = navigationController
window?.makeKeyAndVisible()
return true
}
Method 2:Via storyboard--
Go to respective storyboard & select Is Initial View Controller