App lost control over local notifications after being updated from App Store

Question

I have an app with local notification at the App Store.

In the last 4 version updates to my app, there were customers who experienced something strange - the app lost control over previous notifications, they kept getting all notification scheduled before the update, even though they should've been canceled by [[UIApplication sharedApplication] cancelAllLocalNotifications]!

While communicating with these customers, I told them to turn off reminders, something that performs cancelAllLocalNotifications, but they claim to keep getting reminders.

Also, reinstalling the app doesn't get rid of the old notifications! It's as if iOS thinks this is a different app.

It doesn't happen to most of my customers, only to rare few - but still, it happens every update!

How can it be?

Update

3 years later and it's still happening.

Every update some customers keep receiving local notifications, but the app can't see those, nor can control them.

Can anyone solve this or prove it is a bug of iOS?

Answer 1

Did you check How does UIApplication cancelAllLocalNotifications work between app updates? It doesn't have definitive answers, but maybe it would be useful.

Try to find out what's so special about the customer that experience this:

• Is it always the same customers who experience this behavior?
• Which iOS version they use?
• How are they using you app differently? Have a lot of notification scheduled?
• How are they making the update? (over-the-air, sync, etc.)