setting initial viewcontroller in swift [duplicate] - ios

Question

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Xcode 11 & iOS13, using UIKIT can't change background colour of UIViewController
(1 answer)
Closed 3 years ago.
im trying to set the initial view controller if a user has a token in his keychain.
when I try to set it in the appDelegate like this
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let accessToken: String? = KeychainWrapper.standard.string(forKey: "accessToken")
if accessToken != nil
{
// Take user to a home page
let mainStoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let homePage = mainStoryboard.instantiateViewController(withIdentifier: "home") as! ViewLoader
self.window.rootViewController = homePage
}
return true
}
but I get som errors saying "Value of type 'AppDelegate' has no member 'window'"
it tried to clean the project but without luck

Answer 1

Try this:
window = UIWindow(frame: UIScreen.main.bounds)
let mainStoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let homePage = mainStoryboard.instantiateViewController(withIdentifier: "home") as! ViewLoader
window?.rootViewController = homePage
window?.makeKeyAndVisible()
Init window first and add the function makeKeyAndVisible.

Answer 2

The reason of your error is you do not declare a variable window.
Adding following code in your AppDelegate class is a solution for error:
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let mainStoryboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let homePage = mainStoryboard.instantiateViewController(withIdentifier: "home")
self.window?.rootViewController = homePage
self.window?.makeKeyAndVisible()
return true
}
// ..... more code ...
}