看了很多文章，发现都是集成的老版本FlutterBoost，一些api已经变更，然后又去官网看demo，最终成功集成 FlutterBoost ^1.12.13。

Flutter各版本对应的FlutterBoost请参考 https://github.com/alibaba/flutter_boost/blob/master/README_CN.md

1.创建flutter项目，在终端iOS工程目录同级执行
flutter create -t module flutter_module

2.在pubspec.yaml里添加flutter_boost的依赖

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.3
  flutter_boost: ^1.12.13

3.终端运行：flutter packages get或在IDE里点击packages get

4.flutter项目的main.dart 代码是官方demo的

import 'package:flutter/material.dart';
import 'package:flutter_boost/flutter_boost.dart';
import 'simple_page_widgets.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  void initState() {
    super.initState();

    FlutterBoost.singleton.registerPageBuilders({
      'first': (pageName, params, _) => FirstRouteWidget(),
      'second': (pageName, params, _) => SecondRouteWidget(),
      'tab': (pageName, params, _) => TabRouteWidget(),
      'flutterFragment': (pageName, params, _) => FragmentRouteWidget(params),

      ///可以在native层通过 getContainerParams 来传递参数
      'flutterPage': (pageName, params, _) {
        print("flutterPage params:$params");

        return FlutterRouteWidget();
      },
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Flutter Boost example',
        builder: FlutterBoost.init(postPush: _onRoutePushed),
        home: Container());
  }

  void _onRoutePushed(
      String pageName, String uniqueId, Map params, Route route, Future _) {
  }
}

主要是 FlutterBoost.singleton.registerPageBuilders 和 FlutterBoost.init(postPush: _onRoutePushed)

其他demo页面的代码请去https://github.com/alibaba/flutter_boost example_swift中查看

5.回到iOS工程，添加flutter_boost
修改podfile，里面添加下面代码

target '*****' do
    ......
    use_frameworks!
    ......
    flutter_application_path = "../flutter_module"
    load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
    install_all_flutter_pods(flutter_application_path)
    ......
end

然后执行pod install

6.在AppDelegate.swift里让

import Flutter
import FlutterPluginRegistrant //看自己用不用
import flutter_boost

class AppDelegate: FlutterAppDelegate {
    ......
     override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        
        FlutterBoostPlugin.sharedInstance().startFlutter(with: FlutterRouter()) { (flutterEngine) in
            DDLogInfo("#######  flutterEngine  #########")
        }
    }
}

FlutterRouter是一个实现FLBPlatform协议的类：

class FlutterRouter : NSObject, FLBPlatform{
    //里面实现FLBPlatform协议的方法，具体代码可以参考官方demo自行修改
    func open(_ url: String, urlParams: [AnyHashable : Any], exts: [AnyHashable : Any], completion: @escaping (Bool) -> Void) {
        var animated = false;
        if exts["animated"] != nil{
            animated = exts["animated"] as! Bool;
        }
        let vc = FLBFlutterViewContainer.init();
        vc.setName(url, params: urlParams);
        self.navigationController().pushViewController(vc, animated: animated);
        completion(true);
    }

    func present(_ url: String, urlParams: [AnyHashable : Any], exts: [AnyHashable : Any], completion: @escaping (Bool) -> Void) {
        var animated = false;
        if exts["animated"] != nil{
            animated = exts["animated"] as! Bool;
        }
        let vc = FLBFlutterViewContainer.init();
        vc.setName(url, params: urlParams);
        navigationController().present(vc, animated: animated) {
            completion(true);
        };
    }
    
    func close(_ uid: String, result: [AnyHashable : Any], exts: [AnyHashable : Any], completion: @escaping (Bool) -> Void) {
        var animated = false;
        if exts["animated"] != nil{
            animated = exts["animated"] as! Bool;
        }
        let presentedVC = self.navigationController().presentedViewController;
        let vc = presentedVC as? FLBFlutterViewContainer;
        if vc?.uniqueIDString() == uid {
            vc?.dismiss(animated: animated, completion: {
                completion(true);
            });
        }else{
            self.navigationController().popViewController(animated: animated);
        }
    }
    
    func navigationController() -> UINavigationController {
        let delegate = UIApplication.shared.delegate as! AppDelegate
        let navigationController = delegate.window?.rootViewController as! UINavigationController
        return navigationController;
    }
}

在需要用到Flutter的地方调用FlutterBoostPlugin里的方法，会执行上面协议里的方法，最终实现跳转

FlutterBoostPlugin.open("first", urlParams: ["hello":"world"], exts: [:], onPageFinished: { (map) in
            
        }) { (finishde) in
        
 }

7.运行前需要先打包fluuer项目，可以在Build Phases里添加运行脚本

  "$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" build
  "$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" embed

在Target->Build Settings里添加自定义$FLUTTER_ROOT
FLUTTER_ROOT的值为FlutterSDK的目录路径

8.设置项目的Enable Bitcode 为 No
9.要添加libc++
10.运行iOS项目

步骤如果有遗漏，请大佬们提醒........