I mean, can I change the icon by calling setAlternateIconName when enter the home screen? Before changing the icon, shouldn't a pop-up notify the user of the icon change?

Thank you for comment. There is no problem with calling setAlternateIconName and success completion handler.  Review guidelines: https://developer.apple.com/app-store/review/guidelines/#after-you-submit 4.6 Alternate App Icons  When entering the home screen, I call setAlternateIconName.(No user consent, dynamic, automatic) However, it is not used dynamically or automatically in the last sentence. What do you think the last sentence means?