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.
You can now start a Live Activity with a push notification beginning with iOS 17.2 (currently in beta).
Request a pushToStartToken and use that to send a specific payload to your app. This will start a live activity & grant some background run time allowing you to get the live activity set up, grab the update token, etc.