/// 路由觀察者
final routeObserver = RouteObserver<PageRoute>();

/// MaterialApp
Widget buildMaterialApp(BuildContext context) {
  // 這里直接在 MaterialApp 對(duì)象進(jìn)行全局注冊(cè)，其他模式也有，例如 CupertinoApp、WidgetsAp、Navigator
  return GetMaterialApp(
      title: 'Flutter Demo',
      // 注冊(cè)
      navigatorObservers: [routeObserver],
    );
    ...
    ...
    ...
  }
}

import 'package:flutter/material.dart';
import 'package:base_project/utils/public.dart';

@immutable
class BaseStatefulController extends StatefulWidget {

  const BaseStatefulController({super.key});

  @override
  State<BaseStatefulController> createState() => BaseStatefulControllerState();
}

class BaseStatefulControllerState extends State<BaseStatefulController> with RouteAware {

  /// 啟用路由觀察者
  bool enableRouteObserver = false;

  @override
  void initState() {
    super.initState();
    // 等待加載
    WidgetsBinding.instance.addPostFrameCallback((_) {
      // 初始化上下文完成
      initStateContext();
    });
  }

  /// 初始化上下文完成，可以在這里做一些需要上下文的初始化操作
  void initStateContext () {
    // 注冊(cè)路由監(jiān)聽(tīng)
    if (enableRouteObserver) {
      final route = ModalRoute.of(context);
      if (route is PageRoute) {
        routeObserver.subscribe(this, route);
      }
    }
  }

  @override
  void dispose() {
    // 取消路由監(jiān)聽(tīng)
    routeObserver.unsubscribe(this);
    super.dispose();
  }

  @override
  void didPush() {
    print("頁(yè)面被 push 到棧頂，頁(yè)面可見(jiàn)");
  }
  @override
  void didPop() {
    print("頁(yè)面被 pop，頁(yè)面銷毀");
  }
  @override
  void didPushNext() {
    print("有新頁(yè)面 push 進(jìn)來(lái)，當(dāng)前頁(yè)面進(jìn)入不可見(jiàn)狀態(tài)");
  }
  @override
  void didPopNext() {
    print("上一個(gè)頁(yè)面被 pop，當(dāng)前頁(yè)面重新可見(jiàn)");
  }

  @override
  Widget build(BuildContext context) {
    return Container();
  }
}