how to detect if app is loosing focuse in react native
Copyimport { useFocusEffect } from '@react-navigation/native';
function Profile({ userId }) { const [user, setUser] = React.useState(null);
useFocusEffect( React.useCallback(() => { const unsubscribe = API.subscribe(userId, user => setUser(data));
return () => unsubscribe(); }, [userId]) );
return <ProfileContent user={user} />;}
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