iphone: do a webservice request automatically

I need to do an automatic webservice reque开发者_Python百科st every second in my application to maintain my 3g connection. Anyone got any pointers on how to do this effectively?

Thanks!

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Have a look at Run Loops.

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The NSTimer class should be able to do what you need. There are lots of other questions on SO about connecting to a web service so I won't answer that bit here.