IOS AppDelegate Variable in controller or token - ios

Question

im totally {fresh/beginner} app developer please bear with me if im asking any stupid question.
I trying to show token on my story board when my app runs. if you check my code. i already created delegates variable var tokenVal = "" when i run the app i do not get any value on my story board although, its printing token in console.
2nd issue its showing warnings although its compiling and running.
here is my problem AppDelegate.swift code
import UIKit
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var tokenVal = ""
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
registerPushNotifications()
return true
}
func registerPushNotifications() {
DispatchQueue.main.async {
let settings = UIUserNotificationSettings(types: [.badge, .sound, .alert], categories: nil)
UIApplication.shared.registerUserNotificationSettings(settings)
}
}
func application(_ application: UIApplication, didRegister notificationSettings: UIUserNotificationSettings) {
if notificationSettings.types != UIUserNotificationType() {
application.registerForRemoteNotifications()
}
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
var token = ""
for i in 0..<deviceToken.count {
token = token + String(format: "%02.2hhx", arguments: [deviceToken[i]])
}
tokenVal = token
print(token)
}
func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: NSError) {
print("Registration failed!")
}
func applicationWillResignActive(_ application: UIApplication) {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
}
func applicationDidEnterBackground(_ application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
func applicationWillEnterForeground(_ application: UIApplication) {
// Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}
func applicationDidBecomeActive(_ application: UIApplication) {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
func applicationWillTerminate(_ application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
}
ViewController.swift Code
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var TokenLb: UILabel!
#IBOutlet weak var tokenVarVal: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let appDelegate = UIApplication.shared.delegate as! AppDelegate
//let aVariable = appDelegate.
let bVariable = appDelegate.tokenVal
tokenVarVal.text = bVariable
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

It's a simple matter of the order of operations. The app delegate's tokenVal is being set after the view controller's viewDidLoad runs.
(In general, using one class's property as a "drop" for another class to pick up a value later on is a clumsy strategy. If the other class needs this value, give the value to the other class.)