如何在iOS (Swift4)后台通过流控模块获取推送通知

Question

如何在后台获取推送通知？我在Swift4 iOS 11中遇到了推送通知的问题，只有当应用程序打开时，FCM才能在后台检索通知。

这是我的代码：

AppDelegate.swift

    @UIApplicationMain
    class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate, MessagingDelegate {
        
        var window: UIWindow?
        static var DEVICE_ID = String()
        
        func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
            
            UIApplication.shared.statusBarStyle = .lightContent
            
            FirebaseApp.configure()
            
            if #available(iOS 10.0, *) {
                // For iOS 10 display notification (sent via APNS)
                UNUserNotificationCenter.current().delegate = self
                
                UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound], completionHandler: { (success, error) in
                    print(success)
                })
                
                Messaging.messaging().delegate = self
                
            } else {
                let settings: UIUserNotificationSettings =
                    UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
                application.registerUserNotificationSettings(settings)
            }
            
            application.registerForRemoteNotifications()
            
            return true
        }
        
        func connectToFcm() {
            Messaging.messaging().shouldEstablishDirectChannel = true
            
            if let token = InstanceID.instanceID().token() {
                AppDelegate.DEVICE_ID = token
                print("*********")
                print("Token Instance: \(token)")
                print("*********")
            }
        }
        
        func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
            
            completionHandler([.alert, .sound])
            
        }
        
        func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
            connectToFcm()
        }
        
        func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {
            
            guard let data: [String: Any] = remoteMessage.appData as? [String: Any] else {
                return
            }
            
            print(data)
            
         
        }
        
        func applicationDidBecomeActive(_ application: UIApplication) {
            UIApplication.shared.applicationIconBadgeNumber = 0
            connectToFcm()
        }
        
        func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
            
            
            completionHandler(.newData)
            
        }
        
        
    }

Example: image send push notification with postman

Answer 1

以下是AppDelegate.swift中的源代码：

import UIKit
import UserNotifications
import FirebaseCore
import FirebaseMessaging
import FirebaseInstanceID

struct DataNotif: Codable {
    var title: String?
    var body: String?

    private enum CodingKeys: String, CodingKey {
        case title
        case body
    }
}

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate, MessagingDelegate {

    var window: UIWindow?
    let gcmMessageIDKey = "message_id"

    static var DEVICE_ID = String()
    var msg_body = ""
    var msg_title = ""

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        UIApplication.shared.statusBarStyle = .lightContent

        FirebaseApp.configure()

        Messaging.messaging().delegate = self

        if #available(iOS 10.0, *) {
            // 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 })
        } else {
            let settings: UIUserNotificationSettings =
                UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
            application.registerUserNotificationSettings(settings)
        }

        application.registerForRemoteNotifications()

        return true
    }

    func connectToFcm() {
        Messaging.messaging().shouldEstablishDirectChannel = true
    }

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

        if let refreshedToken = InstanceID.instanceID().token() {
            AppDelegate.DEVICE_ID = refreshedToken
            print("*********")
            print("InstanceID token: \(refreshedToken)")
            print("*********")
        }else{
            print("Can't get token device")
        }

        connectToFcm()

    }

    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("Failed to register for remote notifications with error: \(error)")
    }

    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {

        print(userInfo)

        guard let data: [String: Any] = userInfo as? [String: Any] else {
            return
        }

        let listData = data["notification"] as! String
        let jsonData = listData.data(using: .utf8)
        do {
            let decoder = JSONDecoder()
            let dataJson = try decoder.decode(DataNotif.self, from: jsonData!)

            msg_body = dataJson.body!
            msg_title = dataJson.title!

            createNotification(title: msg_title, body: msg_body)

        }catch{
            print("error")
        }

        completionHandler(.newData)
    }

    // messaging
    func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {

        if let token = InstanceID.instanceID().token() {
            AppDelegate.DEVICE_ID = token
            print("*********")
            print("Token Instance: \(token)")
            print("*********")
        }

        connectToFcm()
    }

    func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {

        print("Received data message: \(remoteMessage.appData)")

        guard let data: [String: Any] = remoteMessage.appData as? [String: Any] else {
            return
        }

        print(data)

        let listData = data["notification"] as! String
        let jsonData = listData.data(using: .utf8)
        do {
            let decoder = JSONDecoder()
            let dataJson = try decoder.decode(DataNotif.self, from: jsonData!)

            msg_body = dataJson.body!
            msg_title = dataJson.title!

            createNotification(title: msg_title, body: msg_body)

        }catch{
            print("error")
        }

    }

    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

        completionHandler([.alert, .badge, .sound])
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        UIApplication.shared.applicationIconBadgeNumber = 0
        connectToFcm()
    }

    func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {

        if let vc = window?.rootViewController as? HomeController {
            vc.scheduleNotification()
        }

        completionHandler(.newData)

    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        Messaging.messaging().shouldEstablishDirectChannel = false
        print("Disconnect FCM")
    }

    func createNotification(title: String, body: String) {
        let content = UNMutableNotificationContent()
        content.title = NSString.localizedUserNotificationString(forKey: title, arguments: nil)
        content.body = NSString.localizedUserNotificationString(forKey: body, arguments: nil)
        content.sound = UNNotificationSound.default()
        content.badge = NSNumber(integerLiteral: UIApplication.shared.applicationIconBadgeNumber + 1)

        let request = UNNotificationRequest.init(identifier: "pushNotif", content: content, trigger: nil)

        let center = UNUserNotificationCenter.current()
        center.add(request)
    }

}

Answer 2

Firebase为推送通知提供后台和前台支持。您可以通过以下步骤轻松解决您的问题：

AppDelegate.swift导入firebase库中的

import Firebase
import FirebaseInstanceID
import FirebaseMessaging
import UserNotifications

每当应用程序启动注册推送通知服务时，请在您的didFinishLaunchingWithOptions中添加以下代码行

 func application(_ application: UIApplication,
                     didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        registerForPushNotifications(application: application)
        return true
    }

添加appDelegate的扩展方法以注册远程通知并从APNS获取设备令牌

       extension AppDelegate {
         func registerForPushNotifications(application: UIApplication) {
             if #available(iOS 10.0, *) {
                    // 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 })
                    // For iOS 10 data message (sent via FCM
                   Messaging.messaging().delegate = self
               } else {
                   let settings: UIUserNotificationSettings =
                    UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
                application.registerUserNotificationSettings(settings)
            }

            application.registerForRemoteNotifications()
        }
      func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let token = deviceToken.map { String(format: "%02.2hhx", $0) }.joined()
        let savedAPNSToken = UserDefaults.standard.object(forKey: "savedAPNSToken") as? String
        if savedAPNSToken != token {
            UserDefaults.standard.set(token, forKey: "savedAPNSToken")
            UserDefaults.standard.synchronize()
            Messaging.messaging().apnsToken = deviceToken
        }
    }

    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print(error.localizedDescription)
    }

    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                     fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        completionHandler(UIBackgroundFetchResult.newData)
    }
}

使用notificationCenter的以下方法在前台和后台状态处理通知:

// MARK: - UNUserNotificationCenterDelegate
@available(iOS 10, *)
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
        completionHandler([.alert])
    }


    /// Handle tap on the notification banner
    ///
    /// - Parameters:
    ///   - center: Notification Center
    ///   - response: Notification response
    func userNotificationCenter(_ center: UNUserNotificationCenter,
                                didReceive response: UNNotificationResponse,
                                withCompletionHandler completionHandler: @escaping () -> Void) {

        let userInfo = response.notification.request.content.userInfo
        completionHandler()
    }

防火墙令牌更新：

// MARK: - MessagingDelegate
extension AppDelegate : MessagingDelegate {
    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
        // Note: This callback is fired at each app startup and whenever a new token is generated.
        let savedFCMToken = UserDefaults.standard.object(forKey: "savedFCMToken") as? String
        if savedFCMToken != fcmToken {
            UserDefaults.standard.set(fcmToken, forKey: "savedFCMToken")
            UserDefaults.standard.synchronize()
            // Update FCMToken to server by doing API call...
        }
    }
}

Answer 3

我不能找出你的代码中的问题，但我发布了应该如何完成的步骤：

应用程序应用程序注册推送通知应用程序(_

1. ：UIApplication，didFinishLaunchingWithOptions launchOptions: UIApplicationLaunchOptionsKey: Any?) -> Bool {

FirebaseApp.configure() self.registerForPushNotifications(application)返回true }函数应用程序(_registerForPushNotifications: UIApplication){ Messaging.messaging().delegate = self if #available(iOS 10，*) {

让center = UNUserNotificationCenter.current() center.requestAuthorization(options:.badge，.alert，.sound) { (granted，error) in //根据授权开启或关闭功能。} center.delegate=self application.registerForRemoteNotifications() } else{ let application.registerForRemoteNotifications=UIUserNotificationSettings(类型：.alert，.badge，.sound，类别: nil) application.registerUserNotificationSettings(settings) application.registerForRemoteNotifications() } }

2.然后处理你的委托：

func application(_ application: UIApplication, 

    didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
            Messaging.messaging().apnsToken = deviceToken

        }

1. 处理您的Firebase消息传递委派:-

扩展消息: MessagingDelegate { func messaging(_ messaging: Messaging，didReceiveRegistrationToken fcmToken: String) {

let token = fcmToken //您可以将token发送到服务器，从服务器获取推送通知}

}

4.然后处理你的UNUserNotificationCenterDelegate：

   func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    // this is called when application is Foreground and push arrives we show alert, sound, here.
                completionHandler([.alert, .sound])

            }
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Swift.Void){
            let pushDictionary = response.notification.request.content.userInfo
         // handle your push here
        }