swift 5.02 ai assistant1 analytics1 app store submission1 apple health1 challenges1 chatgpt1 conversational ai1 customizable1 customizable design1 dynamic interactions1 fitness challenge1 friend comparison1 gpt-41 interactive chat1 ios 13 compatibility1 ios 171 ios app1 leaderboard1 message handling1 real-time chat1 real-time syncing1 step count1 step tracking1 streaming responses1 uikit1 user experience1 user interface1 walking trends1