swift – SwiftUI iOS firebase push notifications – how precisely does didReceiveRemoteNotification work?

That is my AppDeligate:

class AppDelegate: NSObject, UIApplicationDelegate, UNUserNotificationCenterDelegate {
    
    let gcmMessageIDKey = "gcm.message_id"
    
    func software(_ software: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        
        FirebaseApp.configure()
        UNUserNotificationCenter.present().delegate = self
        
        UNUserNotificationCenter.present().requestAuthorization(choices: [.alert, .badge, .sound]) { (granted, error) in
        }
        
        software.registerForRemoteNotifications()
        Messaging.messaging().delegate = self

        return true
    }
    
    func software(_ software: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        if let messageID = userInfo[gcmMessageIDKey] {
            print("Message ID: (messageID)")
        }
        
        guard let aps = userInfo["aps"] as? [String: AnyObject] else {
            completionHandler(.failed)
            return
        }
        print("obtained one thing, aka the (aps)")

        print("11111111")
        print(userInfo)

        completionHandler(UIBackgroundFetchResult.newData)
    }
    
    // Obtain displayed notifications for iOS 10 gadgets.
    func userNotificationCenter(_ heart: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        
        let userInfo = notification.request.content material.userInfo

        // THIS ONE IS ONLY CALLED WHEN APP IS RUNNING
        print("2222222222")
        print(userInfo)

        //completionHandler([[.banner, .badge, .sound]])
        completionHandler([[.banner, .badge]])
    }

    func userNotificationCenter(_ heart: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
      
        // THIS ONE IS ONLY CALLED WHEN YOU TAP ON THE RECEIVED MESSAGE
        let userInfo = response.notification.request.content material.userInfo

        print("333333333333")
        print(userInfo)

        completionHandler()
    }
    
    func software(_ software: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("Unable to register for distant notifications: (error.localizedDescription)")
    }

    func software(_ software: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Knowledge) {
        Messaging.messaging().apnsToken = deviceToken
    }
}

What I’ve seen thus far:

willPresent will get referred to as when the App is presently working.

didReceive will get referred to as after I’m tapping on the acquired notification, regardless of if the App was already working or not.

My 1st query is:

Why is didReceiveRemoteNotification by no means referred to as?

I’ve learn someplace that it will get referred to as when the App is launch construct, however then my 2nd query:

How precisely will it behave, like willPresent or didReceive or in one other means?

And the third query: Will willPresent and didReceive nonetheless work the identical means in launch construct? If sure then can I simply delete didReceiveRemoteNotification or is it nonetheless wanted?

The event goal is ready to iOS 18