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Editorial Team
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Asked: 2026-06-14T08:06:40+00:00

I have an iPhone app that needs to send data (it’s a vote) to

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I have an iPhone app that needs to send data (it’s a vote) to a mySQL server. But the user is only allowed to vote once a day and only once per user. I connect to the mySQL server by sending an HTTP request to a PHP script.

What I need is some sort of unique identifier of the iPhone the user is using. I think it’s OK if the user votes twice using two iPhones, so that isn’t a big concern: the purpose of the identifier is to identify each iPhone.

How can I get this? I would use [[UIDevice currentDevice] uniqueIdentifier] but I have read it is now deprecated. I have read about an open source library but it seems to have privacy leaks.

Can you guys think of any way to do this, either via XCode or via PHP? I would just keep the hasVoted BOOL in the app, but then the user can just uninstall it and make it reset…

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1 Answer

  1. Editorial Team

    You can use CFUUIDCreate to make a random, unique ID. Then save the ID. Do not use NSUserDefaults since it is deleted if the user reinstalls the app. I would save it in the keychain. This is not deleted unless the iPhone is wiped, and the user cannot modify the keychain.

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