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I've just read on a blog that the UDID will not survive iOS 5. I use it as an identifier combined to an app ID I generate myself. Without that UDID, I will just have the App Identifier but as it is stored in the userDefaukts for the moment, it is deleted if the app is uninstalled.

How may I do to keep it safe even if the app is deleted from the iPhone ? I have to achieve this to ensure that I have at least one stable identifier, even if it's not the sole one I use to identify the user.

Oliver
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Check this out, its designed specifically for this problem: https://github.com/gekitz/UIDevice-with-UniqueIdentifier-for-iOS-5

Sean Williamson
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  • if the user remove the app from the iPhone, update it from iTunes some days later and reinstall it, will the MAC-Adresse/Bundle identifier couple generate the same identifier than before ? – Oliver Oct 05 '11 at 16:24
  • Honestly I dont know. I DO know that a lot of developers are using this moving forward, so I am sure that the community can answer that for you. – Sean Williamson Oct 05 '11 at 16:44