Question 288995 in Xcode Question posted in
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Xcode – how to start a liveActivity from a remote notification • Swift

When implementing lock screen live activity widget for debugging purposes I had a button which runs startLiveActivity() function, app runs normaly widget appears totally functioning.

However I need this activity widget to appear whenever the app receives a remote push notification when the app is killed or in background, but it is appearing only when app is in foreground which doesn’t really help the case here.

class LiveActivityHelper: ObservableObject {
    
    static var shared = LiveActivityHelper()
    
    @Published var activity: Activity<Attributes>? = nil

    func startLiveActivity() {
        
        let state = Attributes.ContentState()
        
        activity = try? Activity<Attributes>.request(attributes: Attributes(), contentState: state, pushType: nil)

    }

I tried running the startLiveActivity() function from appDelegate’s didReceiveRemoteNotification:

func userNotificationCenter(_ center: UNUserNotificationCenter,
                                didReceive response: UNNotificationResponse) async {
        
        LiveActivityHelper.shared.startLiveActivity()
}

And from a notification extension I have:

class NotificationService: UNNotificationServiceExtension, UNUserNotificationCenterDelegate {

    var contentHandler: ((UNNotificationContent) -> Void)?
    var bestAttemptContent: UNMutableNotificationContent?

    override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {

    ...
    LiveActivityHelper.shared.startLiveActivity()

All these approaches lead to the same result, the widget appearing only when the app is opened.

Apple’s documentation included updating the widget from a remote notification but not how to start it using that approach.

Tags:

2

Answers


  1. 0

    A Live Activity can only be started while the app is in foreground, because its purpose is to track a user-initiated feature, based on documentation.

    Send your push notification, have your user open your app with it, then start the activity. Your desired flow is explicitly stated to be unsupported.

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  2. 0

    Using actionable notification type can help you by guiding user for tap and hold it to add:

    func userNotificationCenter(_ center: UNUserNotificationCenter,
       didReceive response: UNNotificationResponse,
       withCompletionHandler completionHandler: 
         @escaping () -> Void) {
       
   // Get the details from the original notification.
   let userInfo = response.notification.request.content.userInfo
        
   // Perform the task associated with the action.
   switch response.actionIdentifier {
   case "liveActivity":
      initiateLiveActivity(with: userInfo)
      break

   // Handle other actions…
   default:
      break
   }
    
   // Always call the completion handler when done.    
   completionHandler()
}

    For remote push notifications, you need to prepare valid payload for this. More details about actionable notification from Apple documentation.

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