identifierForVendor changing between updates again?

Question

nailer OP

Created Jan ’17

Replies 4

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Hi!

I might have stumbled upon a little problem:

It seems like [[[UIDevice currentDevice] identifierForVendor] UUIDString] is returning different values after app update. I haven't confirmed it, but I have a hunch, as we've been using it as a secret for storing our session token, and a lot of users seem to be logged out after updating the app.

I know there has been a similar bug before, but I'm wondering whether or not this issue has just resurfaced recently.

Any hints would be greatly appreciated

EDIT:

I'm storing my data in NSUserDefaults, maybe this bug is kicking in?

https://forums.developer.apple.com/thread/71267?sr=stream&ru=2545

EDIT2:

The organisation recently changed names, via a support ticket sent to apple. Could this influence the generation of the identifierForVendor?

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Answer 1

PBK OP

Jan ’17

I vaguely recall something about how you can't rely on successfully accessing NSUserDefault before the App Delegate runs 'didFinishLaunchingWithOptions'.

You wrote:

>The organisation recently changed names

If that means your bundleID for the new app is different then yes, the identifierForVendor will change.

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Answer 2

KMT OP

Jan ’17

I'd lean towards that being the same bug as linked. Might want to file one and see what comes back.

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Answer 3

PBK OP

Jan ’17

And there was a brief period in time (May-July 2015) when an iOS was returning a different identifierForVendor - if your users updated during that period then they have a different identifierForVendor. See:

https://forums.developer.apple.com/message/62336#62336

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Answer 4

nailer OP

Jan ’17

We did not change the bundle-id (that would obviously break everything), but rather the display name of the organisation and how it's shown in the App Store.

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