iOS push notification: how to detect if the user tapped on notification when the app is in background?

Question

There are a lot of stackoverflow threads regarding this topic, but I still didn\'t find a good solution.

If the app is not in the background, I can check launc

Answer 1

There are two Funcs to handle received PushNotification inside PushNotificationManager class:

class PushNotificationManager: NSObject, MessagingDelegate, UNUserNotificationCenterDelegate{

}

As I tested the first on trigger as soon as Notification arrived

@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    
    completionHandler(UNNotificationPresentationOptions.alert)
    
    //OnReceive Notification
    let userInfo = notification.request.content.userInfo
    for key in userInfo.keys {
         Constants.setPrint("\(key): \(userInfo[key])")
    }
    
    completionHandler([])
    
}

And second one when Tapped on Notification:

@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    
    //OnTap Notification
    let userInfo = response.notification.request.content.userInfo
    for key in userInfo.keys {
        Constants.setPrint("\(key): \(userInfo[key])")
    }
    
    completionHandler()
}

I also tested it with both ON and OFF states of Remote Notification(in Background Modes)