iphone XMPP App run background

Question

I created a chat application using XMPP framework..when I quit the app(enter background mode) I want to receive the chat message..and also need to display the icon badge...H

Answer 1

There are a limited number of programs that can run in the background without limit, these being VOIP programs, those that play music, and those that track the user's location. If you're not doing any of these legitimately then you're limited to ten minutes of background operation. Note that Apple will reject apps that try silly tricks like playing 'empty' sounds to keep the app live.

You can find info on running tasks in the background here: http://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html

Your other option I would guess is to have the chat program operate by contacting a server, and to have that server queue responses when a user is offline then deliver them when they next log on. Not being a net programmer myself I don't know how feasible this is, but I think it's the only way to do this indefinitely if you're only offering text chat. The better option would be to make your application VOIP enabled using the guide above.

EDIT As of the release of iOS 5.0, it is also possible to get apps registered as Newsstand applications to download information while backgrounded, plus a bunch of other funky features that are also Newsstand only.

-Ash