flutter : favorite button not change color when pressed

Question

When I press it, my button doesn't change color Does not change color when pressed

return Padding(
                          padding: const EdgeInsets.only(right: 8),
                          child: CircleAvatar(
                            backgroundColor: Colors.red,
                            child: IconButton(
                                onPressed: () =>
                                    snapshot.data.docs.length == 0
                                        ? addToFavorite()
                                        : print("Already Added"),
                                icon: snapshot.data.docs.length == 0
                                    ? Icon(
                                        Icons.favorite_outline,
                                        color: Colors.white,
                                      )
                                    : Icon(
                                        Icons.favorite,
                                        color: Colors.white,
                                      )),
                          ),
                        );

Answer 1

Do you have a call to setState() in your addToFavorite() method?

If not, you must call this function when the IconButton is pressed to update your icon by reevaluating your conditions