iPhone UUID change when App Updated?

Question

I use iphone UUID for checking user's device is unique.

I already know UUID will be changed when reinstall app.

But, I have a question. Then, when app updated, UUID for my app will be changed?

If UUID changed when app updated, where can I save UUID in iphone permanently(or same effect)?

score 1 · Answer 1 · answered Feb 05 '13 at 04:04

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Save out your created UUID into user preferences for the app, which should be backed up - if they restore the app from a backup you'll get back the UUID.

If you want to be even more sure you can get back the same UUID, save the generated UUID into the keychain - the keychain is kept intact even after you delete an app (not sure if that's guaranteed forever but it is the effect).

answered Feb 05 '13 at 04:04

Kendall Helmstetter Gelner

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#Kendall, Is UUID getting changed when app has been updated or device OS version has been upgraded? – Kirti Nikam Jun 29 '15 at 12:52
The stored keychain, and user preferences would both hang around during an upgrade of the app or iOS. – Kendall Helmstetter Gelner Jul 02 '15 at 05:45

bioffe · Answer 2 · 2013-08-25T13:56:16.647

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UDID doesn't change,but it's deprecated. Device ID might change. One can use MAC address if wifi is on, which is pretty much given.

edited Aug 25 '13 at 13:56

answered Feb 05 '13 at 04:09

bioffe

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UDID is deprecated, not UUID. https://developer.apple.com/library/ios/documentation/Foundation/Reference/NSUUID_Class/Reference/Reference.html – Woodstock Aug 24 '13 at 07:56
Question is about UUID – Gajendra K Chauhan Apr 29 '16 at 12:44
That's not what this question is about. The question is about UUID – Eugene Alexeev Mar 29 '17 at 09:46

iPhone UUID change when App Updated?

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