Change icon on of an App in iOS 4 in run-time

Question

How can I change the icon of my App in iOS 4 at run-time the way the icon of the Calendar app changes based on the date today?

I want to publish a 4 digit number nu

Answer 1

The best you can do right now within the bounds of Apple-sanctioned APIs is to add a red badge with a number to the icon using the UIApplication applicationIconBadgeNumber property. Not sure if it's big enough to fit 4 digits though.

That's if you want to set it while the app is open. To update the badge in the background, you will need to either post a UILocalNotification (if you know ahead of time when and what the badge should say), or use push notifications.