将 iOS 操作系统更新到较新版本后，设备令牌是否会更改？

Question

Few of my device have stopped receiving push notification after updating the device to newer iOS version. So, My question is, Does device token change after update iOS OS to newer version? and I need to update my device token on my server too.

Answer 1

Apple Documentation says that we should generate device token every time application launches.

  func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {}

This method get called everytime when application launches and here you need to send device token to server. So it doesn't matter if token changes or not. Apple Push notification server will be aware of new token and should send notification to right device .

And you should never use device token for some kind of device identification.

This is what original documentation says :

Important: Never cache device tokens in local storage. APNs issues a new token when the user restores a device from a backup, when the user installs your app on a new device, and when the user reinstalls the operating system. If you ask the system to provide the token each time, you're guaranteed to get an up-to-date token.