问题描述

我正在使用 FCM 服务器进行远程通知，它可以完美地发送和接收通知.

I'm using FCM server for remote notifications, it worked perfectly with sending and receiving notifications.

我的问题是当设备在后台时，这个函数 func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) 没有调用.

My problem is when the device is in the background, this function func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) doesn't called.

我尝试过的解决方案:

• 这个函数:

• This function:

userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void)

在用户点击通知时调用.否则不会触发.

is called when user tapped on the notification. Otherwise, it's not triggered.

• 将 "content-available": true, "priority": "high" 添加到有效负载中.另外，我尝试了这个值 "content-available": 1.

• Adding "content-available": true, "priority": "high" to the payload. Also, I tried this value "content-available": 1.

这是我的功能代码:

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

推荐答案

如果您使用 Postman 进行测试，请尝试将 "content-available": true 更改为 content_available":是的.content-available 会发送通知，但不会调用 didReceiveRemoteNotification.

If you are testing with Postman then try changing "content-available": true to "content_available" : true. content-available will send notification but it doesn't call didReceiveRemoteNotification.

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