在看flutter boost源码进程中,看到一个messages.m的文件,在文件的开头有这么一行注释

// Copyright (c) 2019 Alibaba Group. All rights reserved.
// Use of this source code is governed by a MIT license that can be
// found in the LICENSE file.
// Autogenerated from Pigeon (v3.2.9), do not edit directly.
// See also: https://pub.dev/packages/pigeon

由此看看来这是一个经过pigeon东西主动生成的代码。 因此研究一下pigeon的简略运用进程。

Flutter Pigeon pub.dev/packages/pi… 是一个用于在Dart和原生代码(如AndroidiOS)之间进行通讯的库。它通常用于在Flutter应用程序和原生平台之间传递数据和调用办法。

以下是运用Flutter Pigeon的一般流程:

创立插件:

flutter create --template=plugin  --platforms=ios,android  test_flutter_plugin -i objc -a java

增加pigeo开发包

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_lints: ^2.0.0
  pigeon:

增加源码

跟lib目录同一个级,新建一个pigeo文件夹,这儿面放接口文件,将来pigeo生成东西,就用这些接口文件来生成代码:

文件名为:message.dart

import 'package:pigeon/pigeon.dart';
@HostApi()
abstract class AppNativeApi {
  String? getHost();
  String? getBrokerId();
}

编写pigeo代码生成脚本

脚本文件名为run_pigeon.sh

 flutter pub run pigeon 
  --input pigeon/message.dart 
  --dart_out lib/message.dart 
  --objc_header_out ios/Classes/message.h 
  --objc_source_out ios/Classes/message.m 
  --java_out android/src/main/java/com/example/test_flutter_plugin/Message.java 
  --java_package "io.flutter.plugins"

运行脚本

sh  run_pigeon.sh

这样咱们就经过一个接口文件,生成了代码:

flutter pigeon主动生成代码东西运用

flutter pigeon主动生成代码东西运用

初始化代码

这儿咱们在插件中初始化

#import "message.h"
@interface TestFlutterPlugin () <AppNativeApi>
@end
@implementation TestFlutterPlugin
+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
    FlutterMethodChannel *channel = [FlutterMethodChannel
                                     methodChannelWithName:@"test_flutter_plugin"
                                     binaryMessenger:[registrar messenger]];
    TestFlutterPlugin *instance = [[TestFlutterPlugin alloc] init];
    [registrar addMethodCallDelegate:instance channel:channel];
    AppNativeApiSetup([registrar messenger], instance);
}
- (nullable NSString *)getBrokerIdWithError:(FlutterError * _Nullable __autoreleasing * _Nonnull)error {
    return @"123";
}
- (nullable NSString *)getHostWithError:(FlutterError * _Nullable __autoreleasing * _Nonnull)error {
    return @"10.253.22.122";
}
@end

运用代码

import 'package:flutter/material.dart';
import 'package:test_flutter_plugin/message.dart';
class TestPigeon extends StatefulWidget {
  const TestPigeon({super.key});
  @override
  State<TestPigeon> createState() => _TestPigeonState();
}
class _TestPigeonState extends State<TestPigeon> {
  String? host;
  String? brokerId;
  @override
  void initState() {
    super.initState();
    loadData();
  }
  Future<void> loadData() async {
    brokerId = await AppNativeApi().getBrokerId();
    setState(() {});
    host = await AppNativeApi().getHost();
    setState(() {});
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ListView(
        children: [
          Text('$brokerId'),
          Text('$host'),
        ],
      ),
    );
  }
}

总结

本文经过运用 pigeon,编写一个简略的dart完成的接口文件,就可以主动生成native 和 flutter之间通讯的一个通道。

经过在flutter端调用通道的api(pigeon主动生成的),就可以获取native端的数据。