1. FlutterBoost源码

• FlutterBoostApp->pop方法

  Future<bool> pop(
      {String? uniqueId, Object? result, bool onBackPressed = false}) async {
    BoostContainer? container;
    if (uniqueId != null) {
      container = _findContainerByUniqueId(uniqueId);
      if (container == null) {
        Logger.error('uniqueId=uniqueId not found');
        return false;
      }
      if (container != topContainer) {
        await _removeContainer(container);
        return true;
      }
    } else {
      container = topContainer;
    }
    // ---------------------追加部分-----------------------------------
    // 返回键再处理
    if(onBackPressed) {
      List<PopCallback> callbackList = Binding().observers();
      for(PopCallback callback in callbackList) {
        var params = await callback.call();
        if(result == null) {
          result = params;
        } else if(result is Map) {
          result = {...result,...params};
        }
        break;
        // print(">>>>>>>>>> callBackparams");
        // if(params is Map && params.containsKey("key") && params["key"] == container?.pageInfo?.pageName) {
        // }
      }
    }
    // --------------------------------------------------------

    final currentPage = topContainer?.topPage.pageInfo.uniqueId!;
    assert(currentPage != null);
    // .........
    return true;
  }

2. 额外新增类

typedef PopCallback = Future<Map<String,dynamic>> Function();

class Binding {
  final List<PopCallback> _observers = <PopCallback>[];

  void addObserver(PopCallback observer) => _observers.add(observer);

  bool removeObserver(PopCallback observer) => _observers.remove(observer);

  static final Binding _instance = Binding._internal();

  factory Binding() {
    return _instance;
  }

  Binding._internal();

  List<PopCallback> observers() => _observers;
}

import 'package:flutter/material.dart';

import 'binding.dart';

class BoostWillPopeScope extends StatefulWidget {
  final Widget child;
  final PopCallback? onWillPop;
  BoostWillPopeScope({required this.child,this.onWillPop,Key? key}) : super(key: key);

  @override
  State<BoostWillPopeScope> createState() => _BoostWillPopeScopeState();
}

class _BoostWillPopeScopeState extends State<BoostWillPopeScope>{
  @override
  void initState() {
    super.initState();
    if(widget.onWillPop != null) {
      Binding().addObserver(widget.onWillPop!);
    }
  }

  @override
  void dispose() {
    super.dispose();
    if(widget.onWillPop != null) {
      Binding().removeObserver(widget.onWillPop!);
    }
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    if (widget.onWillPop != null)
      Binding().removeObserver(widget.onWillPop!);
    if (widget.onWillPop != null)
      Binding().addObserver(widget.onWillPop!);

  }

  @override
  void didUpdateWidget(BoostWillPopeScope oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (widget.onWillPop != oldWidget.onWillPop) {
      if (oldWidget.onWillPop != null)
        Binding().removeObserver(oldWidget.onWillPop!);
      if (widget.onWillPop != null)
        Binding().addObserver(widget.onWillPop!);
    }
  }

  @override
  Widget build(BuildContext context) {
    return widget.child;
  }
}

3. export将BoostWillPopeScope暴露

flutter_boost.dart追加导包

4. 使用

同flutter sdk内的WillPopeScope

return BoostWillPopeScope(
    // 添加方法回调并返回需要的参数即可
    onWillPop: () async => {
      "key":RouterKeys.feedback_history
    },
    child: Scaffold(
        backgroundColor: CommonColors.backgroundColor,
        appBar: GpAppBar(
            elevation: 0,
            leadingColors: CommonColors.appbarIconBlackColor,
            title: Text("历史记录"),
        ),
        body: Text("")
    ),
);