Open your storyboard. Click on the view controller corresponding to the view that you want to be the default view. Open the Attributes Inspector. Check the Is Initial View Controller check box in the View Controller section.
Starting from Xcode11, because of SceneDelegates, it's likely that you shouldn't do it inside AppDelegate
. Instead do it from SceneDelegate
. For more on that see this other answer
I used this thread to help me convert the objective C to swift, and its working perfectly.
Instantiate and Present a viewController in Swift
Swift 2 code:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewController = storyboard.instantiateViewControllerWithIdentifier("LoginSignupVC")
self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()
return true
}
Swift 3 code:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewController = storyboard.instantiateViewController(withIdentifier: "LoginSignupVC")
self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()
return true
}
Try this. For example:
You should use UINavigationController
as the initial view controller. Then, you can set any view controller as root from the storyboard.
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let navigationController = storyboard.instantiateInitialViewController() as UINavigationController
let rootViewController = storyboard.instantiateViewControllerWithIdentifier("VC") as UIViewController
navigationController.viewControllers = [rootViewController]
self.window?.rootViewController = navigationController
return true
}
See my storyboard screen.
For new Xcode 11.xxx and Swift 5.xx, where the target it set to iOS 13+.
For the new project structure, AppDelegate does not have to do anything regarding rootViewController.
A new class is there to handle window(UIWindowScene) class -> 'SceneDelegate' file.
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
window.rootViewController = // Your RootViewController in here
self.window = window
window.makeKeyAndVisible()
}
}
Swift 3, Swift 4:
Change first line to
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool
the rest is same.
Swift 5+:
Instantiate root view controller from storyboard:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// this line is important
self.window = UIWindow(frame: UIScreen.main.bounds)
// In project directory storyboard looks like Main.storyboard,
// you should use only part before ".storyboard" as its name,
// so in this example name is "Main".
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
// controller identifier sets up in storyboard utilities
// panel (on the right), it is called 'Storyboard ID'
let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewControllerIdentifier") as! YourViewController
self.window?.rootViewController = viewController
self.window?.makeKeyAndVisible()
return true
}
If you want to use UINavigationController
as root:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// this line is important
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewControllerIdentifier") as! YourViewController
let navigationController = UINavigationController.init(rootViewController: viewController)
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()
return true
}
Instantiate root view controller from xib:
It is almost the same, but instead of lines
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewControllerIdentifier") as! YourViewController
you'll have to write
let viewController = YourViewController(nibName: "YourViewController", bundle: nil)
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