flutter与原生通信

1.FlutterMethodChannel 通过method invocation一次通信
flutter这边

class _MyAppState extends State<MyApp> {
 final MethodChannel _oneChannel = MethodChannel('one_page');
 final MethodChannel _towChannel = MethodChannel('tow_page');
 String _pageIndex;

 @override
 void initState() {
   super.initState();
   _oneChannel.setMethodCallHandler((call) {
     setState(() {
       _pageIndex = call.method;
     });
     return null;
   });
   _towChannel.setMethodCallHandler((call) {
     setState(() {
       _pageIndex = call.method;
     });
     return null;
   });
 }

@override
 Widget build(BuildContext context) {
   return MaterialApp(
     title: 'Flutter Demo',
     theme: ThemeData(
       primarySwatch: Colors.blue,
     ),
     home: _rootPage(_pageIndex),
   );
 }
Widget _rootPage(String pageIndex) {
   switch (pageIndex) {
     case 'one':
       return Scaffold(
         appBar: AppBar(
           title: Text(pageIndex),
         ),
         body: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
             RaisedButton(
               onPressed: () {
                 _oneChannel.invokeMapMethod('exit');
               },
               child: Text(pageIndex),
             ),
           ],
         ),
       );
     case 'tow':
       return Scaffold(
         appBar: AppBar(
           title: Text(pageIndex),
         ),
         body: Center(
             child: RaisedButton(
           onPressed: () {
             _towChannel.invokeMapMethod('exit');
           },
           child: Text(pageIndex),
         )),
       );
     default:
       return Scaffold(
         appBar: AppBar(
           title: Text("default"),
         ),
         body: Center(
             child: RaisedButton(
           onPressed: () {
             MethodChannel('default_page').invokeMapMethod('exit');
           },
           child: Text(pageIndex),
         )),
       );
   }
 }
}

在原生

- (IBAction)pushFlutter:(id)sender {
    //告诉Flutter显示one_page
    FlutterMethodChannel * methodChannel = [FlutterMethodChannel methodChannelWithName:@"one_page" binaryMessenger:self.flutterVc];
    [methodChannel invokeMethod:@"one" arguments:nil];
    self.flutterVc.modalPresentationStyle = UIModalPresentationFullScreen;
    //弹出Flutter页面!
    [self presentViewController:self.flutterVc animated:YES completion:nil];
    //监听Flutter页面的回调
    __weak typeof(self) weakSelf = self;
    [methodChannel setMethodCallHandler:^(FlutterMethodCall * _Nonnull call, FlutterResult  _Nonnull result) {
        //如果是要我退出
        if ([call.method isEqualToString:@"exit"]) {
            [weakSelf.flutterVc dismissViewControllerAnimated:YES completion:nil];
        }
    }];
    
}

- (IBAction)pushFlutterTow:(id)sender {
    //告诉Flutter显示one_page
       FlutterMethodChannel * methodChannel = [FlutterMethodChannel methodChannelWithName:@"tow_page" binaryMessenger:self.flutterVc];
    [methodChannel invokeMethod:@"tow" arguments:nil];
    self.flutterVc.modalPresentationStyle = UIModalPresentationFullScreen;
       //弹出Flutter页面!
       [self presentViewController:self.flutterVc animated:YES completion:nil];
       //监听Flutter页面的回调
    __weak typeof(self) weakSelf = self;
       [methodChannel setMethodCallHandler:^(FlutterMethodCall * _Nonnull call, FlutterResult  _Nonnull result) {
           //如果是要我退出
           if ([call.method isEqualToString:@"exit"]) {
               [weakSelf.flutterVc dismissViewControllerAnimated:YES completion:nil];
           }
       }];
}

这样就可以在原生界面完美启动不同的flutter页面了
以下两种都是属于持续通信
2.FlutterBasicMessageChannel 用于传递字符&半结构化信息
flutter这边

  final BasicMessageChannel _messageChannel = BasicMessageChannel('messageChannel', StandardMessageCodec())

    _messageChannel.setMessageHandler((message) {
      print('收到来自iOS的：$message');
      return null;
    });
    
    _messageChannel.send("hello");//发送给原生的消息

在原生那边

    FlutterBasicMessageChannel* msgChannel = [FlutterBasicMessageChannel messageChannelWithName:@"messageChannel" binaryMessenger:self.flutterVC];
    [msgChannel setMessageHanlder:^(id _Nullable message, FlutterReply _Nonnull callback) {
        NSLog(@"收到的Flutter的：%@"， message);
    }];

      [msgChannel sendMessage:@"hello flutter"];//发送给flutter消息

3.FlutterEventChannel 用于传输数据流（stream）