Late Swift starter – AppDelegate

1. Configure startup items

(Swift3.0)

1. Create a non-NavigationController root view

var window: UIWindow?
var viewController: UIViewController?

func application(_ application: UIApplication.didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        self.window = UIWindow.init(frame: UIScreen.main.bounds)
        let vc = ViewController(a)self.viewController = vc
        self.window?.rootViewController = self.viewController
        self.window?.makeKeyAndVisible()
        return true
    }
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2. Include navigationController root view creation

Method 1

var window: UIWindow?
var viewController: UINavigationController?

func application(_ application: UIApplication.didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        self.window = UIWindow.init(frame: UIScreen.main.bounds)
        let vc = ViewController(a)self.viewController = UINavigationController.init(rootViewController: vc)
        self.window?.rootViewController = self.viewController
        self.window?.makeKeyAndVisible()
        return true
}
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Method 2 (swift, 4.0)

In the AppDelegate. Swift

window = UIWindow(frame: UIScreen.main.bounds)
let rootVC = ViewController(a)let navrootVC = UINavigationController(rootViewController: rootVC)
window?.rootViewController = navrootVC
window?.makeKeyAndVisible()
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SceneDelegate. Swift

guard let winScene = (scene as? UIWindowScene) else { return }
        
let rootvc = ViewController(a)let rootNav = UINavigationController(rootViewController: rootvc)
 
let win = UIWindow(windowScene: winScene)
win.rootViewController = rootNav
win.makeKeyAndVisible()
window = win
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3. Use storyboard to jump controller code in the AppDelegate

@icelovery func application(application: UIApplication.didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
	self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
	let storyboard = UIStoryboard(name: "Main", bundle: nil)
	let viewController = storyboard.instantiateViewControllerWithIdentifier("Storybord name")
	self.window?.rootViewController = viewController
	self.window?.makeKeyAndVisible()
	return true
}
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