上一篇文章介紹了如何集成Flutter_Boost，本篇將詳細(xì)介紹flutter如何與原生進(jìn)行交互。

首先給出文章demo，具體代碼可作參考。

一：flutter_module項(xiàng)目使用FlutterBoost進(jìn)行路由配置

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

void main() {
  run App(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(),
      'flutterPage': (pageName, params, _) {
        print("flutterPage params:$params");
        return FlutterRouteWidget(params:params);
      },
    });
  }

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

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

這里首先在Widget builder中初始化了FlutterBoost，然后在initState方法中通過(guò)FlutterBoost為三個(gè)頁(yè)面注冊(cè)了路由，這里注冊(cè)的路由是原生與flutter通用的，這個(gè)后面可以體現(xiàn)。

二：在Flutter頁(yè)面路由中使用FlutterBoost跳轉(zhuǎn)

總結(jié)在Flutter中有以下幾種跳轉(zhuǎn)方式：
1.Flutter=>Flutter（使用Flutter自己的路由）

Navigator.push(context, MaterialPageRoute(builder: (_) => FirstRouteWidget()));

以下三種跳轉(zhuǎn)方式，都是通過(guò)FlutterBoost進(jìn)行跳轉(zhuǎn)，使用的是同一個(gè)方法，只是場(chǎng)景有所不同

FlutterBoost.singleton.open( String url,{Map<dynamic,dynamic> urlParams,Map<dynamic,dynamic> exts)

參數(shù)分別為：頁(yè)面名稱，通信傳參，擴(kuò)展參數(shù)。對(duì)應(yīng)相應(yīng)跳轉(zhuǎn)方式使用如下：
2.Flutter=>Flutter（使用原生的navigationController）
例：first頁(yè)面打開(kāi)路由名稱為second頁(yè)面，傳參為{"query": “aaa”}，擴(kuò)展參數(shù)中可以添加一些特殊數(shù)據(jù)，這里添加了{(lán)"animated": true}，在原生中會(huì)解析為帶動(dòng)畫跳轉(zhuǎn)

FlutterBoost.singleton.open( "second",urlParams: {"query": "aaa"}, exts: {"animated": true})

3.Flutter=>原生（push）
例：first頁(yè)面打開(kāi)原生NativeViewController頁(yè)面，拼接native將在原生項(xiàng)目中解析為跳轉(zhuǎn)原生頁(yè)面，拼接push表明跳轉(zhuǎn)方式。

FlutterBoost.singleton.open( "native_push_NativeViewController",urlParams: {"query": "aaa"}, exts: {"animated": true})

4.Flutter=>原生（present）
同上，使用present跳轉(zhuǎn)方式。

FlutterBoost.singleton.open( "native_present_NativeViewController",urlParams: {"query": "aaa"}, exts: {"animated": true})

另外，F(xiàn)lutter關(guān)閉或返回上級(jí)頁(yè)面使用的是close方法，分為兩種
1.關(guān)閉當(dāng)前頁(yè)面

FlutterBoost.singleton.closeCurrent(result: {}, exts: {});

2.通過(guò)id關(guān)閉指定頁(yè)面

FlutterBoost.singleton.close('id', result: {}, exts: {});

三：原生項(xiàng)目中配置路由通信

import Foundation

//實(shí)現(xiàn)FLBPlatform協(xié)議方法，flutter項(xiàng)目和原生項(xiàng)目使用FlutterBoost進(jìn)行的跳轉(zhuǎn)都會(huì)通過(guò)該類進(jìn)行處理
class PlatformRouterImp: NSObject, FLBPlatform {
    //處理打開(kāi)原生頁(yè)面邏輯
    func openNative(_ url: String, urlParams: [AnyHashable : Any], exts: [AnyHashable : Any], completion: @escaping (Bool) -> Void) {
        var animated = false
        if exts["animated"] != nil{
            animated = exts["animated"] as! Bool
        }
        //與flutter端約定跳轉(zhuǎn)原生的url為三段式結(jié)構(gòu)native_method_name
        let urlArr = url.components(separatedBy: "_")
        if urlArr.count == 3 {
            //通過(guò)類名找到相應(yīng)頁(yè)面
            let cls : AnyClass? = NSClassFromString("TestWithFlutter." + urlArr[2])
            //該項(xiàng)目中的vc都繼承于BaseViewController，加了一個(gè)params用來(lái)接收Flutter傳過(guò)來(lái)的參數(shù)，另有方案的話改為UIViewController即可。
            if let clsType = cls as? BaseViewController.Type {
                let targetVC = clsType.init()
                targetVC.params = urlParams
                if urlArr[1] == "push" {
                    self.navigationController().pushViewController(targetVC, animated: animated)
                    completion(true)
                } else if urlArr[1] == "present" {
                    let navVC = UINavigationController(rootViewController: targetVC)
                    self.navigationController().present(navVC, animated: animated) {
                        completion(true)
                    }
                }
            }
        }
    }
    //FlutterBoost的open方法會(huì)在這里進(jìn)行處理
    func open(_ url: String, urlParams: [AnyHashable : Any], exts: [AnyHashable : Any], completion: @escaping (Bool) -> Void) {
        if url.prefix(6) == "native" {//約定前面字符為native時(shí)跳轉(zhuǎn)原生頁(yè)面
            openNative(url, urlParams: urlParams, exts: exts, completion: completion)
        } else {//否則打開(kāi)Flutter頁(yè)面
            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)
        }
    }
    //FlutterBoost的present方法會(huì)在這里進(jìn)行處理，F(xiàn)lutter項(xiàng)目中不分present打開(kāi)方式，都會(huì)走open方法
    func present(_ url: String, urlParams: [AnyHashable : Any], exts: [AnyHashable : Any], completion: @escaping (Bool) -> Void) {
        //直接present出的navVC，會(huì)導(dǎo)致flutter路由中uniqueid混亂，有待研究
//        var animated = false
//        if exts["animated"] != nil{
//            animated = exts["animated"] as! Bool
//        }
        let vc = FLBFlutterViewContainer.init()
        vc.setName(url, params: urlParams)
        let navVC = UINavigationController(rootViewController: vc)
        navVC.modalPresentationStyle = .fullScreen
        let delegate = UIApplication.shared.delegate as! AppDelegate
        delegate.window?.rootViewController = navVC
//        navigationController().present(navVC, animated: animated) {
//            completion(true)
//        }
    }
    //FlutterBoost的close方法會(huì)在這里進(jìn)行處理
    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)
        }
    }
    //獲取應(yīng)用的navigationController，用來(lái)進(jìn)行跳轉(zhuǎn)
    func navigationController() -> UINavigationController {
        let delegate = UIApplication.shared.delegate as! AppDelegate
        let navigationController = delegate.window?.rootViewController as! UINavigationController
        return navigationController
    }
}

四：在AppDelegate中初始化FlutterBoost

import UIKit
import Flutter

@UIApplicationMain
class AppDelegate: FlutterAppDelegate {
    
    override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        let router = PlatformRouterImp.init();
        FlutterBoostPlugin.sharedInstance().startFlutter(with: router, onStart: { (engine) in
        });
        
        self.window = UIWindow.init(frame: UIScreen.main.bounds)
        let viewController = ViewController.init()
        let navi = UINavigationController.init(rootViewController: viewController)
        self.window.rootViewController = navi
        self.window.makeKeyAndVisible()
        
        return true
    }
    
}

五：原生使用FlutterBoost進(jìn)行跳轉(zhuǎn)

例：原生跳轉(zhuǎn)Flutter路由名為flutterPage的頁(yè)面

        FlutterBoostPlugin.open("flutterPage", urlParams:["query":"aaa"], exts: ["animated":true], onPageFinished: { (_ result:Any?) in
            print(String(format:"call me when page finished, and your result is:%@", result as! CVarArg));
        }) { (f:Bool) in
            print(String(format:"page is opened"));
        }