How often to authenticate iOS app in web service

Posted by jeraldov on Programmers See other posts from Programmers or by jeraldov
Published on 2013-10-04T00:29:59Z Indexed on 2013/10/22 16:02 UTC
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Filed under:

ios

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web-services

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authentication

I am trying to build an iOS app that connects to a PHP+MySQL web service. My question is how often should I check for user's authentication to get data from the web service. My app requires a login at start up, but I am wondering if how often should I check if he can still validly get data from the web service. Should I check for his username and password each time the user views a table view that get its data from the web service?

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