Device UUID not unique when user uninstall and re-install

Question

I have a system where each user allowed to install apps for two devices only. The issue is happened when user uninstall and reinstall again on the same device. So it will ge

Answer 1

This is the expected bevaiour. If you want to use same UUID you need to save it to the keyChain. I have done something simmiler in of my apps using KeyChainWrapper

So here is a sample chunk for you

let deviceId = UIDevice.currentDevice().identifierForVendor?.UUIDString ?? ""
// Saving Id in keyChain
KeychainWrapper.defaultKeychainWrapper().setString(deviceId, forKey: "CurrentDeviceId")

And then just get Id from keyChain everytime you want to use it.

let previousDeviceId = KeychainWrapper.defaultKeychainWrapper().stringForKey("CurrentDeviceId")