CODEWITHSUNDEEP
iosswiftuuiduniqueidentifier
ABCreation
ABCreation

Reputation: 5

Different UUID in swift 2.2

Before Swift 2.2 the UUID value was the same every time I opened the app, now changes at every opening

I use this code:

UIDevice.currentDevice().identifierForVendor!.UUIDString

How can I do now to identify the user?

Upvotes: 0

Views: 1386

Answers (4)

Krivvenz
Krivvenz

Reputation: 4039

This actually seems to be a bug IMO. Everytime I run my app in the simulator it generates a new Vendor ID. You can probably get round it by storing the ID into NSUserDefaults on the first bootup then retrieving / comparing the value from NSUserDefaults instead of getting it from identifierForVendor. This will save a static vendor id in defaults but in theory the vendor id will still be changing every boot up.

Kind Regards,

Krivvenz.

Update: I can confirm I have installed multiple apps on the same simulator too but the vendor ID is still changing on every boot.

Update 2: - I have logged this as a bug with Apple - 26195931.

Upvotes: 1

nhgrif
nhgrif

Reputation: 62052

There are a couple of answers that explain why the UUID is resetting. There's one that offers a potential work around, but I'd consider it far from ideal. But I want to highlight something important about the way UUID's work that serves as a great workaround that has absolutely zero impact on the production OR debug version of your code base or compiled binary.

The value in this property remains the same while the app (or another app from the same vendor) is installed on the iOS device. The value changes when the user deletes all of that vendor’s apps from the device and subsequently reinstalls one or more of them.

All you have to do to prevent this value from changing while developing App-A is to simply install App-B from the same vendor (yourself) and keep it installed during the life time of App-A's development. This is literally as simple as starting a blank new iOS project and install the blank slate to your test device (using the same developer account & such), and then never uninstall it again during development.

App-B keeps a constant UUID for the vendor (yourself) so no matter how many times you delete and reinstall App-A, it will always keep the same UUID.

Upvotes: 4

Nilesh Patel
Nilesh Patel

Reputation: 6394

The value of this property is the same for apps that come from the same vendor running on the same device. A different value is returned for apps on the same device that come from different vendors, and for apps on different devices regardless of vendor.

The value in this property remains the same while the app (or another app from the same vendor) is installed on the iOS device. The value changes when the user deletes all of that vendor’s apps from the device and subsequently reinstalls one or more of them. The value can also change when installing test builds using Xcode or when installing an app on a device using ad-hoc distribution. Therefore, if your app stores the value of this property anywhere, you should gracefully handle situations where the identifier changes.

Refer this link for more info.

Upvotes: 0

Witterquick
Witterquick

Reputation: 6150

Every time you delete the app, the UUID may change. If you just close and open the app, it's should be the same. But if you delete the app (or install it again via xcode), it might change.

Upvotes: 4

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