Open Radar

 
Area:
UserNotifications Framework

Summary:
We have a popular push notification SDK (OneSignal). Our SDK allows apps to attach images to their push notifications dynamically. To do this, we register buttons/etc. to a UNNotificationCategory in a Notification Service Extension.

This has worked perfectly since iOS 10. However, now in iOS 12, we are seeing occasional issues, especially for newly installed apps, where actions/attachments registered to a UNNotificationCategory don't show up on notifications. 

Steps to Reproduce:
1. Add a Notification Service Extension target to an app
2. In the Notification Service Extension in the `didReceiveNotificationRequest` method, create a `UNNotificationCategory` and add some actions to it, and register the new category using `UNUserNotificationCenter.current.setNotificationCategories([your_category])`
3. To make sure the notification uses this category, on the `UNMutableNotificationContent` instance, set the `categoryIdentifier` to be the same as the category created in step 2

Expected Results:
The notification should now have the buttons from step 2. 

Actual Results:
However in our testing (and for many app developers using our SDK), notifications often seem to ignore the category identifier and don't show the correct actions.


Version/Build: iOS 12.0.0