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Я внедрил push-уведомления в свое приложение SwiftUI, и, похоже, все работает нормально. Как вы знаете, нет AppDelegate, но мы все равно можем использовать @UIApplicationDelegateAdaptor .

Однако мне не нравится этот подход, и мне интересно, есть ли способ реализовать это без AppDelegate?

 class AppDelegate: NSObject, UIApplicationDelegate {
    private var gcmMessageIDKey = "gcmMessageIDKey"
    
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        Messaging.messaging().delegate = self
        
        // For iOS 10 display notification (sent via APNS)
        UNUserNotificationCenter.current().delegate = self
        
        let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
        UNUserNotificationCenter.current().requestAuthorization(options: authOptions, completionHandler: {_, _ in })
        
        application.registerForRemoteNotifications()
        
        return true
    }
    
    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
        // If you are receiving a notification message while your app is in the background,
        // this callback will not be fired till the user taps on the notification launching the application.
        // TODO: Handle data of notification
        
        // With swizzling disabled you must let Messaging know about the message, for Analytics
        // Messaging.messaging().appDidReceiveMessage(userInfo)
        
        // Print message ID.
        if let messageID = userInfo[gcmMessageIDKey] {
            print("Message ID: (messageID)")
        }
        
        // Print full message.
        print(userInfo)
    }
    
    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                     fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        // If you are receiving a notification message while your app is in the background,
        // this callback will not be fired till the user taps on the notification launching the application.
        // TODO: Handle data of notification
        
        // With swizzling disabled you must let Messaging know about the message, for Analytics
        // Messaging.messaging().appDidReceiveMessage(userInfo)
        
        // Print message ID.
        if let messageID = userInfo[gcmMessageIDKey] {
            print("Message ID: (messageID)")
        }
        
        // Print full message.
        print(userInfo)
        
        completionHandler(UIBackgroundFetchResult.newData)
    }
    
}

extension AppDelegate : UNUserNotificationCenterDelegate {
    
    // Receive displayed notifications for iOS 10 devices.
    func userNotificationCenter(_ center: UNUserNotificationCenter,
                                willPresent notification: UNNotification,
                                withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        let userInfo = notification.request.content.userInfo
        
        // With swizzling disabled you must let Messaging know about the message, for Analytics
        // Messaging.messaging().appDidReceiveMessage(userInfo)
        
        // Print message ID.
        if let messageID = userInfo[gcmMessageIDKey] {
            print("Message ID: (messageID)")
        }
        
        // Print full message.
        print(userInfo)
        
        // Change this to your preferred presentation option
        completionHandler([[.banner, .sound]])
    }
    
    func userNotificationCenter(_ center: UNUserNotificationCenter,
                                didReceive response: UNNotificationResponse,
                                withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo
        // Print message ID.
        if let messageID = userInfo[gcmMessageIDKey] {
            print("Message ID: (messageID)")
        }
        
        // With swizzling disabled you must let Messaging know about the message, for Analytics
        // Messaging.messaging().appDidReceiveMessage(userInfo)
        
        // Print full message.
        print(userInfo)
        
        completionHandler()
    }
}

extension AppDelegate: MessagingDelegate {
    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String?) {
        print("Firebase registration token: (String(describing: fcmToken))")
        
        let dataDict:[String: String] = ["token": fcmToken ?? ""]
        NotificationCenter.default.post(name: Notification.Name("FCMToken"), object: nil, userInfo: dataDict)
        // TODO: If necessary send token to application server.
        // Note: This callback is fired at each app startup and whenever a new token is generated.
        
        // Add a new document in collection "cities"
        
        guard let registrationToken = fcmToken else { return }
        guard let uid = Auth.auth().currentUser?.uid else { return }
        
        let db = Firestore.firestore()
        
        db.collection("users").document(uid).updateData(["registrationToken": registrationToken]) { err in
            if let err = err {
                print("Error writing document: (err)")
            }
        }
    }
}
 

Эта ссылка отвечает на ваш вопрос? Цитирование:

Вы можете использовать @UIApplicationDelegateAdaptor для предоставления AppDelegate :

 class AppDelegate: NSObject, UIApplicationDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        return true
    }
}
@main struct SampleApp: App {
    @UIApplicationDelegateAdaptor private var appDelegate: AppDelegate
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}
 

Я только нахожусь на стадии исследования того, как это сделать, так что вы, вероятно, впереди меня. Но похоже, что, как может подразумевать название, @UIApplicationDelegateAdaptor позволяет использовать AppDelegate, созданный в приведенном выше коде.

Эта другая ссылка, возможно, объясняет это лучше. Похоже, это очень похоже на использование UIKit внутри SwiftUI.