Whatever happens to iOS Application's data persistence when the App gets deleted?

Question

I want to keep some of the critical(and less memory consuming) data of my App(ex: licence key or user credentials), stored in the device. In normal scenario, when the user deletes the App from the device, all the data related to the particular App gets deleted.

But I would like to override this behavior, and store some important stuff inside the device's disk, so that it does not get deleted along with the App. How to do that? Any help is much appreciated.

Answer 1

you can always store the license key and user credentials in the ios keychain.. it will stay there even if you delete the app. You can use the SSKeyChain API to access the key chain. Keep in mind you can only trivial string info this way.

Answer 2

Hopefully for obvious reasons that isn't possible. (What if every app did that? They you'd delete every app on your device and still find that gigabytes of space were being taken up by "deleted" apps.)

No, if you want data to be saved even after deletion, you'd need to store it in "the cloud" somewhere.