I want the user to select one option out of the given options but this alert should come only during the first launch…
any ideas on this?
Presumably you also want to remember what they chose, so store that somewhere and use a check for its presence to indicate whether this is the “first launch”. Depending on how seriously you want to police “first launch”, you can either use local storage (easier to deal with, but less reliable because it can get wiped from underneath you) or sqlite (heavier, but more reliable).