iOS集成Flutter及交互

1、新建项目。注意！！！将我们项目 BitCode 选项设置为 NO ， Flutter 目前还不支持。
2、cd到工程目录下
3、创建一个Flutter项目模块，执行：

flutter create -t module flutter_module

4、运行flutter_module，才会生成framework，显示隐藏文件拷贝 App.framework和engine 到iOS工程目录 Flutter文件夹下

image.png

5、将Flutter模块以pod的方式加入到项目中

flutter_application_path = '../flutter_module'
eval(File.read(File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')), binding)

6、添加App.framework 和flutter.framework到

Link Binary With Libraries (3 items).png

运行如果出现dyld: Library not loaded: @rpath/Flutter.framework/Flutter……错误

image.png

7、controller中调用

FlutterViewController *vc = [[FlutterViewController alloc] init];
 [self presentViewController:vc animated:YES completion:nil];

8、打包时报错

IPA processing failed

2020-02-10 070818 +0000 warning Configuration issue platform iPhoneSimulator.platform doesn't have any non-simulator SDKs; ig.png

因为项目中使用的SDK包含x86_64架构，iOS13苹果取消了32位系统的支持

cd到framework下，执行

lipo -remove x86_64 Flutter -o Flutter

#############################################################

接下来就是iOS和Flutter的交互问题了，和Android、Flutter交互一样需要依靠MethodChannel和EventChannel
iOS代码：

    FlutterViewController *vc = [[FlutterViewController alloc] init];
    //显示哪个页面
    [vc setInitialRoute:@"secondApp"];
    [self.navigationController pushViewController:vc animated:YES];
    
   //和flutter中保持一致
    NSString *channelName = @"POP_VC";
    NSString *eventName = @"EVENT_VC";
    //ios给flutter传参
    FlutterEventChannel *eventChannel = [FlutterEventChannel eventChannelWithName:eventName binaryMessenger:vc];
    [eventChannel setStreamHandler:self];
    
    
    //flutter给ios传参数
    FlutterMethodChannel *methodChannel = [FlutterMethodChannel methodChannelWithName:channelName binaryMessenger:vc];
    [methodChannel setMethodCallHandler:^(FlutterMethodCall * _Nonnull call, FlutterResult  _Nonnull result) {
        if ([call.method isEqualToString:@"iospushtovc"]) {
            //iospushtovc  
        }else if ([call.method isEqualToString:@"pushiosnewvc"]) {
            //pushiosnewvc
        }
    }];

#pragma mark - FlutterStreamHandler
//Flutter端开始监听这个channel时的回调，第二个参数 EventSink是用来传数据的载体。
- (FlutterError *)onListenWithArguments:(id)arguments eventSink:(FlutterEventSink)events {
    self.eventSink = events;
    self.eventSink(@"传值给flutter：参数111");
    return nil;
}
// flutter不再接收
-(FlutterError *)onCancelWithArguments:(id)arguments{
    self.eventSink = nil;
    return nil;
}

Flutter代码：

void main() => runApp(_widgetForRoute(window.defaultRouteName));

///根据iOS调用时传入的参数判断显示哪个Widget
Widget _widgetForRoute(String routeStr) {
  switch(routeStr) {
    case 'firstApp':
      return MyApp();
      break;
    case 'secondApp':
      return secondRoute();
      break;
    default:
      return tabbar();
  }
}

新建一个工具类

class FlutterPlugin {
  static const methodChannel = const MethodChannel('POP_VC');
  static const eventChannel = const EventChannel('EVENT_VC');
  //告诉ios，需要跳转到下一页了。ios自己跳,并传给ios一个字符串
  static Future<void> backIosToVc() async{
    await methodChannel.invokeMethod('iospushtovc', '这是flutter传递的字符串');
  }
  static Future<void> pushIOSToVc() async{
    await methodChannel.invokeMethod('pushiosnewvc', '这是flutter传递的字符串');
  }
  //传给ios一个map
  static Future<void> iOSGetMap() async{
    Map map = {"code":"1", "data":[1,2,3]};
    await methodChannel.invokeMethod("iosgetmap",map);
  }
 
}

class secondRoute extends StatefulWidget{
  _secondRouteState createState() => _secondRouteState();
}


class _secondRouteState extends State {
  String title = "跳转到ios原生界面";
  @override
  void initState() {
    super.initState();
//监听事件    
FlutterPlugin.eventChannel.receiveBroadcastStream(12345).listen(_onEvent,onError:_onError);
  }
//收到iOS的值
  void _onEvent(Object event){
    setState(() {
      title = event.toString();
    });
  }

  // 错误返回
  void _onError(Object error) {

  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "Flutter Route",
      theme: ThemeData(primaryColor: Colors.blue),
      home: Scaffold(
        body: Container(
          child: Padding(
            padding: EdgeInsets.only(top: 120, left: 60),
            child: Column(
              children: <Widget>[
                FlatButton(
                    onPressed: (){
                   //给iOS端传值
                      FlutterPlugin.backIosToVc();
                    },
                    child: Text("返回到ios界面  参数：" + title,style: TextStyle(color: Colors.red,fontSize: 16),)),
                FlatButton(
                    onPressed: (){
                  //给iOS端传值
                      FlutterPlugin.pushIOSToVc();
                    }
                    , child: Text("进入ios新界面"))
              ],
            ),
          )
        ),
      ),
    );
  }
}