在iOS上未收到远程推送通知

Question

I'm currently rewriting my app from Objective-C to Swift and working on notifications. For some reason Swift version of the app is not receiving any remote push notifications while Objective-C version does.

Here's the code I'm using to register for notifications in AppDelegate:

    UNUserNotificationCenter.current().delegate = self
    let options: UNAuthorizationOptions = [.badge, .alert, .sound]
    UNUserNotificationCenter.current().requestAuthorization(options: options, completionHandler: { granted, error in
        print("access granted: \(granted)")
    })
    application.registerForRemoteNotifications()

I assume that the app successfully registers because didRegisterForRemoteNotificationsWithDeviceToken method gets called. But when I try to send the test notification using the token I got from that method, I don't get actual notification on device.

Also none of these methods get called:

func pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, for type: PKPushType) {

}

func userNotificationCenter(_ center: UNUserNotificationCenter, openSettingsFor notification: UNNotification?) {

}

func userNotificationCenter(_ center: UNUserNotificationCenter,  willPresent notification: UNNotification, withCompletionHandler   completionHandler: @escaping (_ options:   UNNotificationPresentationOptions) -> Void) {

}

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

}

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {

}

func application(_ application: UIApplication, handleActionWithIdentifier identifier: String?, forRemoteNotification userInfo: [AnyHashable : Any], completionHandler: @escaping () -> Void) {

}

What am I doing wrong?

Answer 1

you say that you are not receiving so let's first make sure that those methods you mention before that are not being called are comming from here extension AppDelegate: UNUserNotificationCenterDelegate (By the way when you do implement the didReceive method make sure you call the completionHandler() at the end)

When you do this:

application.registerForRemoteNotifications()

Make sure to run it from the main thread , as it can be called if not specified from the background and that might fail. You can do so by doing

DispatchQueue.main.async { 
  UIApplication.shared.registerForRemoteNotifications()
}

I'll assume that you are getting the device token this way or something similar:

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        // 1. Convert device token to string
        let tokenParts = deviceToken.map { data -> String in
            return String(format: "%02.2hhx", data)
        }
        let token = tokenParts.joined()
        // 2. Print device token to use for PNs payloads
        print("Device Token: \(token)")
}

Finally implement this method to see if there are any errors while registering the device

func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        // 1. Print out error if PNs registration not successful
        print("Failed to register for remote notifications with error: \(error)")
 }

Oh by the way (just in case you have missed it) make sure you enabled in your project's target the push notification.

Answer 2

Make sure you have enabled Push notification in your project setting capabilities. How to enable: go to target: -> select project -> go to capabilities -> go to Push Notification. enable it there.

Another thing is the certificate. While development you should not Production certificates.