didReceiveRemoteNotification 未在 iOS 的前台 firebase 云消息传递中调用

Question

我尝试在我的应用中实现 Firebase 云消息传递。

我使用以下代码注册通知

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)
}

当应用程序位于后台时，一切正常，但是当应用程序位于前台时，根本不调用didReceiveRemoteNotification。

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
// Print message ID.
print("please help")
if let messageID = userInfo[gcmMessageIDKey] {
print("Message ID: (messageID)")
}
// Print full message.
print(userInfo)
completionHandler(.newData)
}

有人知道这可能的错误吗？谢谢！

编辑：当应用程序处于前台时，我不需要看到通知显示，我只想处理来自通知的消息

Answer 1

iOS 10.x 有一个新功能，可以在前台处理推送通知，您应该实现这个函数：

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler(
[UNNotificationPresentationOptions.alert,
UNNotificationPresentationOptions.sound,
UNNotificationPresentationOptions.badge])
}

Answer 2

请实现以下方法在前台接收推送通知

对于 iOS10、Swift3：

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) 
{
completionHandler([.alert, .badge, .sound])
}

对于iOS10，Swift 2.3：

@available(iOS 10.0, *)
func userNotificationCenter(center: UNUserNotificationCenter, willPresentNotification notification: UNNotification, withCompletionHandler completionHandler: (UNNotificationPresentationOptions) -> Void)
{
//Handle the notification
completionHandler(
[UNNotificationPresentationOptions.Alert,
UNNotificationPresentationOptions.Sound,
UNNotificationPresentationOptions.Badge])
}

试试这个一次：

func application(application: UIApplication,  didReceiveRemoteNotification userInfo: [NSObject : AnyObject],  fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {
print("Recived: (userInfo)")
completionHandler(.NewData)
}

Answer 3

如果您使用 IOS 10 版的推送通知 Firebase。 请添加此代码。希望能帮你解决这个问题：

@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)")
}
// Print full message.
print(userInfo)
completionHandler([])
}
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 full message.
print(userInfo)
completionHandler()
}
}
extension AppDelegate : FIRMessagingDelegate {
// Receive data message on iOS 10 devices while app is in the foreground.
func applicationReceivedRemoteMessage(_ remoteMessage: FIRMessagingRemoteMessage) {
print(remoteMessage.appData)
}
}