How to identify a user on iOS?

Question

I am using LibGDX and for the Android version of my game I use the "Get Accounts" permission to identify a user by their Gmail address.

Is their a similar way to identify a user for iOS?

Answer 1

According to the App Store Guidelines, you shouldn't get user's personal data without obtaining the user's prior permission. The only identifier you can use anonymously is identifierForVendor:

UIDevice.currentDevice().identifierForVendor?.UUIDString

This identifier is common for all your apps on the user's device. If all the apps were deleted from the device, the identifier may change. More.