ios - Programmatically check whether or not application was previously installed by user

Question

I want to check whether or not my application was previously installed on a particular device. Is there any programmatic way to do so?

Answer 1

You can use keychain. but when user reset his/her phone this value will be lost . I think there is no option is available to such case except you have to use iAd in your app. apple provide unique id for that that will remain constant after reinstall application.