I do have a event-registration system where users can register online in a web app as well as an iOS app. The events are synced with the local calendar on the iPhone.
Now what I would like to achieve is that whenever the user changes something in the web app that it will automatically update the devices calendar. I tried push and background fetch, but both does not work when the user force quits the app. Is there any way to at least periodically run some code in the app to do an update?