在前臺接收Firebase通知但不是後臺

Question

我試過了所有提示，以便在後臺彈出提醒。我在應用程序打開或啓動時收到數據。因爲我收到通知，我假設它在我的AppDelegate代碼中，或者在我的.plist中可能有錯誤？我已經關注了Firebase通知中的一些標準教程，所有這些代碼都來自這些教程。

import UIKit 
import CoreData 
import Firebase 
import UserNotifications 
import FirebaseInstanceID 
import FirebaseMessaging 

@UIApplicationMain 
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate, MessagingDelegate { 
    var window: UIWindow? 
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { 
     FirebaseApp.configure() 
     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() 



     // Override point for customization after application launch. 

     NotificationCenter.default.addObserver(self, selector: #selector(self.tokenRefreshNotification(_:)), 
                 name: NSNotification.Name.InstanceIDTokenRefresh, object: nil) 

     return true 
    } 

    func application(application: UIApplication, 
        didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) { 
     Messaging.messaging().apnsToken = deviceToken 
    } 

    func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) { 
     print("refreshed token") 
    } 

    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. 

     // Messaging.messaging().disconnect() 
     // print("Disconnected from FCM.") 
    } 

    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. 
     connectToFcm() 
    } 

    func applicationWillTerminate(_ application: UIApplication) { 
     // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 
     // Saves changes in the application's managed object context before the application terminates. 
     self.saveContext() 
    } 

    // MARK: - Core Data stack 

    lazy var persistentContainer: NSPersistentContainer = { 
     /* 
     The persistent container for the application. This implementation 
     creates and returns a container, having loaded the store for the 
     application to it. This property is optional since there are legitimate 
     error conditions that could cause the creation of the store to fail. 
     */ 
     let container = NSPersistentContainer(name: "firetail") 
     container.loadPersistentStores(completionHandler: { (storeDescription, error) in 
      if let error = error as NSError? { 
       // Replace this implementation with code to handle the error appropriately. 
       // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. 

       /* 
       Typical reasons for an error here include: 
       * The parent directory does not exist, cannot be created, or disallows writing. 
       * The persistent store is not accessible, due to permissions or data protection when the device is locked. 
       * The device is out of space. 
       * The store could not be migrated to the current model version. 
       Check the error message to determine what the actual problem was. 
       */ 
       fatalError("Unresolved error \(error), \(error.userInfo)") 
      } 
     }) 
     return container 
    }() 

    // MARK: - Core Data Saving support 

    func saveContext() { 
     let context = persistentContainer.viewContext 
     if context.hasChanges { 
      do { 
       try context.save() 
      } catch { 
       // Replace this implementation with code to handle the error appropriately. 
       // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. 
       let nserror = error as NSError 
       fatalError("Unresolved error \(nserror), \(nserror.userInfo)") 
      } 
     } 
    } 
    @objc private func tokenRefreshNotification(_ notification: Notification) { 
     if let refreshedToken = InstanceID.instanceID().token() { 
      print("InstanceID token: \(refreshedToken)") 
     } 

     // Connect to FCM since connection may have failed when attempted before having a token. 
     connectToFcm() 
    } 

    func connectToFcm() { 
     // Won't connect since there is no token 
     guard InstanceID.instanceID().token() != nil else { 
      return 
     } 

     // Disconnect previous FCM connection if it exists. 
     Messaging.messaging().disconnect() 

     Messaging.messaging().connect { (error) in 
      if error != nil { 
       print("Unable to connect with FCM. \(error?.localizedDescription ?? "")") 
      } else { 
       print("Connected to FCM.") 
      } 
     } 
    } 

    public func application(received remoteMessage: MessagingRemoteMessage) { 

     print(remoteMessage.appData) 
    } 

} 

Answer 1

有幾件事情需要注意：

1. 模擬器無法收到推送通知。
2. 您必須在項目功能中啓用推送通知和後臺模式（遠程通知&後臺提取）。

嘗試添加幾行代碼到你的應用程序代理：

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) { 
     // Will not be called until you open your application from the remote notification (returns to foreground) 

     // Note: *with swizzling disabled you must let Messaging know about the message 
     // Messaging.messaging().appDidReceiveMessage(userInfo)` 

     // Print message ID. 
     if let messageId = userInfo["gcm.message_id"] { 
      print("Message Id: \(messageId)") 
     } 

     // Print full message. 
     print(userInfo) 
     Messaging.messaging().appDidReceiveMessage(userInfo) 
    } 

    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) { 
     // Will not be called until you open your application from the remote notification (returns to foreground) 

     // Note: *with swizzling disabled you must let Messaging know about the message 
     // Messaging.messaging().appDidReceiveMessage(userInfo) 

     // Print message id 
     if let messageId = userInfo["gcm.message_id"] { 
      print("Message Id: \(messageId)") 
     } 

     // Print full message. 
     print(userInfo) 
     Messaging.messaging().appDidReceiveMessage(userInfo) 

     completionHandler(UIBackgroundFetchResult.newData) 
    } 

我也注意到你映射你的APNS使用令牌消息（在didRegisterForRemoteNotificationsWithDeviceToken）：

Messaging.messaging().apnsToken = deviceToken 

我會嘗試你的運氣用以下代替它：

Messaging.messaging().setAPNSToken(deviceToken, type: MessagingAPNSTokenType.sandbox) 
     Messaging.messaging().setAPNSToken(deviceToken, type: MessagingAPNSTokenType.prod) 

祝你好運！

Answer 2

一定要通過Firebase以高優先級設置而不是標準/默認優先級發送消息。