IOS 13 APNS didRegisterForRemoteNotificationsWithDeviceToken 未调用

Question

1. In capabilities, both Push Notification and Background Mode (Remote notification) is opened.

2. I check the value of UIApplication.shared.isRegisteredForRemoteNotifications in my homepage. The value is true

3. I use 4G/3G not wifi (will it influence the APNS call back?)

4. I use Xcode 11.1 (11A1027) and the device is Iphone 11

5. Both didRegisterForRemoteNotificationsWithDeviceToken and didFailToRegisterForRemoteNotificationsWithError not called

6. my code:

    fileprivate func registerPushService() { let center = UNUserNotificationCenter.current() center.delegate = self center.requestAuthorization(options: [.badge, .sound, .alert]) { (granted, error) in if (granted) { DispatchQueue.main.async { UIApplication.shared.registerForRemoteNotifications() } } }

registerPushService() is called on didFinishLaunchingWithOptions .

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Looks like if allowed wifi environment only...

Answer 1

Do you perhaps the .provisional option set?

requestAuthorization(options: [.provisional, .badge, .sound, .alert])

I had the behaviour you describe with this option. When I removed it, the registration went ahead and I got the token. I still haven't figured out how to force it to get a token with this option short of sending local notification first to prompt the user for acceptance of notifications.

Answer 2

I would actually move UIApplication.shared.registerForRemoteNotifications() outside of the requestAuthorization block. The confusing thing about this API is that calling registerForRemoteNotifications() and receiving a device token does not require user permission - requesting the different notification types (badge, sound, alert) is what actually triggers it. Also be sure to try this on a real device - not simulator. If I recall correctly, remote notifications do not work in simulator and the delegate callbacks will not be called.