当应用程序在后台时处理 iOS 推送通知

Question

I have to handle push when the app in background / running. I'm using firebase and native push services. Setting up Capability - Background Fetch . I'm receiving push's all and I can open app taping on push view when the app in the background and handle push when the app is running. But I have to implement follow:

When app running.

Receive push, show alert, logout user. Works!

When app in background / closed. Open app from the push.

Handling this action in didReceiveRemoteNotification method. Works!

When app in background / closed. When open app from the app icon.

Handling this action in didReceiveRemoteNotification method. Doesn't work! .

How can I get push When app in background / closed . Save data (ex. badge count or push can in AppDelegate variable). And get this in applicationDidBecomeActive method?

Answer 1

to handle push notifications you need to implement two methods, one is called when the app is closed, and one is called when app is in foreground.

extension AppDelegate: UNUserNotificationCenterDelegate {
   /// Called when the app receive the notification in foreground
   /// - Parameter center: <#center description#>
   /// - Parameter notification: <#notification description#>
   /// - Parameter completionHandler: <#completionHandler description#>
   func userNotificationCenter(_ center: UNUserNotificationCenter,  willPresent notification: UNNotification, withCompletionHandler   completionHandler: @escaping (_ options:   UNNotificationPresentationOptions) -> Void) {
       let userInfo = notification.request.content.userInfo

       // Get aps object
       let aps = userInfo["aps"] as! [String : Any]
       // Do your stuff here

       // This line is NEEDED, otherwise push will not be fired
       completionHandler([.alert, .badge, .sound]) // Display notification depending on your needed
   }


   /// Detect when user tap on a push message when app is closed
   /// - Parameter center: <#center description#>
   /// - Parameter response: <#response description#>
   /// - Parameter completionHandler: <#completionHandler description#>
   func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

       let userInfo = response.notification.request.content.userInfo
       // Get aps object
       let aps = userInfo["aps"] as! [String : Any]
       // Do your stuff here

       // This line is NEEDED, otherwise push will not be fired
       completionHandler()
   }
}

And in your didFinishLaunchingWithOptions set your AppDelegate as delegate:

// Set AppDelegate as UNUserNotificationCenterDelegate
UNUserNotificationCenter.current().delegate = self

Hope this can help :-)