ios - applicationReceivedRemoteMessage 只在前台执行

Question

我的项目使用 Firebase 通知作为其 APNs 服务，但我一直在使用 Firebase 控制台向我的设备发送通知作为测试，它们只在前台显示(通过控制台输出)。当应用程序处于后台或设备处于锁定屏幕时，设备不会收到任何通知。但是，当我备份打开应用程序时，控制台输出最终确实从 applicationReceivedRemoteMessage 方法到达。

func applicationReceivedRemoteMessage(_ remoteMessage: FIRMessagingRemoteMessage) {

        print("%@", remoteMessage.appData)
        print("QQQQQ")
    }

示例输出:

%@ [AnyHashable("notification"): {
    body = Hi;
    e = 1;
}, AnyHashable("from"): 492525072004, AnyHashable("collapse_key"): org.myApp]
QQQQQ

Answer 1

iOS 和数据消息存在问题。它说 here那个

On iOS, FCM stores the message and delivers it only when the app is in the foreground and has established a FCM connection.

所以必须有一个变通办法。类似于我的东西:

发送 2 个推送通知:

1) Normal to wake the users phone / initiate while the app is in background using this code:

{
  "to" : "/topics/yourTopicName",
  "notification" : {
    "priority" : "Normal",
    "body" : "Notification Body like: Hey! There something new in the app!",
    "title" : "Your App Title (for example)",
    "sound" : "Default",
    "icon" : "thisIsOptional"
  }
}

2) Data notification that will trigger when user opens the app

{
  "to" : "/topics/yourTopicName",
  "data" : {
      "yourData" : "1",
      "someMoreOfYourData" : "This is somehow the only workaround I've come up with."
  }
}

因此，在 - (void)applicationReceivedRemoteMessage:(FIRMessagingRemoteMessage *)remoteMessage 方法下处理您的数据:

- (void)applicationReceivedRemoteMessage:(FIRMessagingRemoteMessage *)remoteMessage {
// Print full message
NSLog(@"%@", remoteMessage.appData);
//
//*** ABOUT remoteMessage.appData ***//
// remoteMessage.appData is a Key:Value dictionary
// (data you sent with second/data notification)
// so it's up to you what will it be and how will the
// app respond when it comes to foreground.
}

我还会留下这段代码来触发应用程序内部的通知(创建本地通知)，因为你可以用它来创建一个静音横幅，也许，这样即使应用程序进入前台，用户也会再次收到通知:

NSDictionary *userInfo = remoteMessage.appData;    
UILocalNotification *localNotification = [[UILocalNotification alloc] init];
localNotification.userInfo = userInfo;
localNotification.soundName = UILocalNotificationDefaultSoundName;
localNotification.alertBody = userInfo[@"yourBodyKey"];
localNotification.alertTitle = userInfo[@"yourTitleKey"];
localNotification.fireDate = [NSDate date];
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];

它会在应用进入前台的那一秒触发通知。