Are values stored in NSUserDefaults removed when the app that put them there is uninstalled?

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No, it will not. I use NSUserDefaults in the exact same manner, and it will not stay after the app is deleted. You can verify this via Organizer if you need to.

It will however persist through updates. I have been using TestFlightApp for all of my beta testing, and the token (and other saved user default data) remains. Hope this helps.

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