How can I set badge count of iOS app from its today extension?

Question

I'm looking for a way to update the badge count of iOS app icon from its iOS8 today extension. Today extension has a button and by touching that button, user can increase or decrease badge count of iOS app. Can anyone help me with this?

PS: I need to update the badge count without reopening the app even when the app is terminated.

Answer 1

As you already have created group, you can keep a file in the group folder and add a filewatcher in extension, update the file from app, and filewatcher will catch the change, and your work is done.