我查看了我能找到的每个帖子并反复阅读Firebase文档，但我找不到错误。我的应用程序在前台接收FCM数据消息，因此没有问题。但是，当应用程序在后台运行时，不会收到任何数据。一旦应用程序打开，它甚至不显示。 消息优先级设置为“高”，“content-available”设置为true。我应该收到一堆身份证。 这是我的AppDelegate代码（主要来自FCM示例代码）：
//
// AppDelegate.swift
//
import UIKit
import UserNotifications
import Firebase
import FirebaseInstanceID
import FirebaseMessaging
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
let gcmMessageIDKey = "gcm.message_id"
func application(_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
if UserDefaults.standard.bool(forKey: "launched_before") == false {
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Settings", bundle: nil)
let initialViewController = storyboard.instantiateViewController(withIdentifier: "welcomeViewController") as! WelcomeViewController
self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()
} else {
// Register for remote notifications. This shows a permission dialog on first run, to
// show the dialog at a more appropriate time move this registration accordingly.
// [START register_for_notifications]
if #available(iOS 10.0, *) {
// For iOS 10 display notification (sent via APNS)
UNUserNotificationCenter.current().delegate = self
// For iOS 10 data message (sent via FCM)
FIRMessaging.messaging().remoteMessageDelegate = self
} else {
let settings: UIUserNotificationSettings =
UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
application.registerUserNotificationSettings(settings)
}
application.registerForRemoteNotifications()
// [END register_for_notifications]
FIRApp.configure()
// Add observer for InstanceID token refresh callback.
NotificationCenter.default.addObserver(self,
selector: #selector(self.tokenRefreshNotification),
name: .firInstanceIDTokenRefresh,
object: nil)
}
return true
}
// [START receive_message]
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
// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
print("Message ID: \(messageID)")
}
// Print full message.
print(userInfo)
print("METHOD 2")
completionHandler(.newData)
}
// [END receive_message]
// [START refresh_token]
func tokenRefreshNotification(_ notification: Notification) {
if let refreshedToken = FIRInstanceID.instanceID().token() {
print("InstanceID token: \(refreshedToken)")
}
// Connect to FCM since connection may have failed when attempted before having a token.
connectToFcm()
}
// [END refresh_token]
// [START connect_to_fcm]
func connectToFcm() {
// Won't connect since there is no token
guard FIRInstanceID.instanceID().token() != nil else {
return;
}
// Disconnect previous FCM connection if it exists.
FIRMessaging.messaging().disconnect()
FIRMessaging.messaging().connect { (error) in
if error != nil {
print("Unable to connect with FCM. \(error)")
} else {
print("Connected to FCM.")
}
}
}
// [END connect_to_fcm]
func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
print("Unable to register for remote notifications: \(error.localizedDescription)")
}
// This function is added here only for debugging purposes, and can be removed if swizzling is enabled.
// If swizzling is disabled then this function must be implemented so that the APNs token can be paired to
// the InstanceID token.
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
print("APNs token retrieved: \(deviceToken)")
// With swizzling disabled you must set the APNs token here.
FIRInstanceID.instanceID().setAPNSToken(deviceToken, type: FIRInstanceIDAPNSTokenType.unknown)
FIRMessaging.messaging().subscribe(toTopic: "/topics/substitutions")
FIRMessaging.messaging().subscribe(toTopic: "/topics/debug")
}
// [START connect_on_active]
func applicationDidBecomeActive(_ application: UIApplication) {
connectToFcm()
}
// [END connect_on_active]
// [START disconnect_from_fcm]
func applicationDidEnterBackground(_ application: UIApplication) {
FIRMessaging.messaging().disconnect()
print("Disconnected from FCM.")
}
// [END disconnect_from_fcm]
func evaluateRecievedData (remoteMessage: FIRMessagingRemoteMessage) {
// Evaluate the data...
}
}
// [START ios_10_message_handling]
@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
// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
print("Message ID: \(messageID)")
}
// Change this to your preferred presentation option
completionHandler(.alert)
}
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)")
}
print("USER HAS PRESSED BANNER")
// Do some stuff...
completionHandler()
}
}
// [END ios_10_message_handling]
// [START ios_10_data_message_handling]
extension AppDelegate : FIRMessagingDelegate {
// Receive data message on iOS 10 devices while app is in the foreground.
func applicationReceivedRemoteMessage(_ remoteMessage: FIRMessagingRemoteMessage) {
print(remoteMessage.appData)
self.evaluateRecievedData(remoteMessage: remoteMessage)
print("RECIEVED MESSAGE (FOREGROUND)")
}
}
// [END ios_10_data_message_handling]
我已激活推送通知和后台模式：Info.plist中的“远程通知”。理想情况下，我想在后台处理数据，并向用户发送通知，如果它涉及到它们。
发送的数据如下所示：
{
"to": "\/topics\/substitutions",
"priority": "high",
"content_available": true,
"data": {
"debug": true,
"new_ids": [
7914,
7915,
7916,
7917,
7918
],
"updated_ids": [
]
}
}
如果有人知道解决这个问题的方法，我会非常感激。
答案 0 :(得分：1)
您必须添加notification有效负载才能在后台接收通知。
{
"to": "\/topics\/substitutions",
"priority": "high",
"content_available": true,
"data": {
"debug": true,
"new_ids": [
7914,
7915,
7916,
7917,
7918
],
"notification":{
"title":"Sample Title",
"body":"sample body!"
}
"updated_ids": [
]
}
}