Background Service in iPhone

I wan to know that How can I implement background services in iPhone 4.0 or later so that even if I close my application it keeps on running in the background and keeps on updating my GUI Text etc

I am new in iPhone that i why i am posting that quest开发者_JS百科ion in that portal.

Please Help me with some code and guidelines.

Thanks a lot

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Well the iOS does not have background services. You can make you app run in background but only if it is a VOIP client, Audio player or will respond to location changes.