为什么flutter AppBar的automaticImplyLeading属性没有效果？

Question

In main.dart file, I set appBar Theme as follows.

AppBarTheme(
  color: AppColors.colorWhite,
  elevation: 0,
  iconTheme: IconThemeData(
    color: AppColors.colorBlack
  ),
  centerTitle: false,
),

And then, the result of this appBarTheme is shown as following image.

But, some pages show a back button and some pages do not.

Showing a back button page's code is this.

return AppBar(
  title: KoreanText(
  TextValues.myPageAppBarText,
    style: TextStyle().pageTitle,
  ),
);

And, not showing page's code is this.

return AppBar(
  title: KoreanText(
    controller.formatCurrentDate(),
    style: TextStyle().pageTitle,
  ),
  actions: [
    _buildAppBarActions(),
  ],
);

In addition, the automaticallyImplyLeading attribute in all Screen's AppBar did not work at all.

Could you tell me which part of code is wrong in mine...?

---

Edit 1

I am using GetX Library for state management.

And, only bottom navigation's child screen does not have a back button.

A parent page with bottom navigation bar is a main page, child one is a home page.

The main page and home page is not a relation of child routing, but the main page has a home page inside it.

In upper case, the home page's back button is not showing.

Answer 1

Back button is not showing when navigating using bottom navigation bar because it doesn't push new screens on your navigation stack contrary to when using Get.to() or Get.toNamed() or Navigator.push() . The back icon/button is only implied when there's more than on item on your navigation stack.