Swift & Push Notification : application(_:didReceiveRemoteNotification:fetchCompletionHandler:) does not get called

Question

I'm configuring push notification is swift. But I noticed that the method below doesn't get called for some reason. Could you tell me why? Are there any necessary setups I should have done? Thank you

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        print("Received data message: \(userInfo)")
        
        let name = Notification.Name(rawValue: K.Event.pushRequest)
        
        completionHandler(.newData)
    }

Answer 1

need post

NotificationCenter.default.post(name:object:)

//AppDelegate
func application(_ application: UIApplication,
                 didReceiveRemoteNotification userInfo: [AnyHashable:Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    print("Received data message: \(userInfo)")

    let name = Notification.Name(rawValue: K.Event.pushRequest)
    NotificationCenter.default.post(name: name, object: nil) //or your object

    completionHandler(.newData)
}

also, you need to addObserver in UIViewController

addObserver(_:selector:name:object:)

//your viewController
override func viewDidLoad() {
    super.viewDidLoad()
    
    let name = Notification.Name(rawValue: K.Event.pushRequest)
    NotificationCenter.default.addObserver(self,
                                           selector: #selector(handleNotification),
                                           name: name, 
                                           object: nil) //or your object
}

@objc func handleNotification(_ notification: Notification) {
    print("notification")
}