UniApp implements extension and usage guide for Flutter native components

UniApp implements Flutter native component expansion and usage guide

Introduction:
UniApp is a cross-platform development framework that can use Vue.js to build iOS, Android, H5 and mini-program applications. Flutter is a UI framework launched by Google that can build beautiful, fast and highly customized applications. This article will introduce how to use Flutter native components to extend UniApp to achieve richer functions and better user experience.

1. Understanding basic concepts

1. Flutter native components
   Flutter native components refer to the rich UI components provided in the Flutter framework, such as buttons, text boxes, images, etc. . They can be used directly and have good cross-platform adaptability and performance advantages.
2. UniApp
   UniApp is a cross-platform framework based on Vue.js. Applications can be written using JavaScript and compiled into codes for different platforms such as iOS, Android, H5 and applets. UniApp provides a set of platform-independent APIs that allow developers to easily implement application functions.

2. Preparation work
Before using UniApp to extend Flutter native components, you need to ensure that the following conditions are met:

1. Flutter SDK has been installed and configured Good related environment variables.
2. The UniApp development environment based on Vue.js has been installed.
3. The test environment is set up.

3. Expanding and using Flutter native components in UniApp

1. Creating a UniApp plug-in for Flutter native components

First, we need to create a UniApp plug-in for extending and using Flutter native components. Execute the following command in the terminal:

uniplugin init <your-plugin-name>
cd <your-plugin-name>

2. Writing Flutter native components

In the plug-in directory created in step 1, find the lib directory, Then create a new Flutter module. Execute the following command in the terminal:

flutter create -t module <your-module-name>

This will create a new Flutter module under the lib directory.

3. Set the association between the UniApp plug-in and the Flutter module

In the created UniApp plug-in directory, find the platforms/ directory and open flutter .json file. In that file, replace <your-module-name> with the name of the Flutter module created in step 2.

4. Using Flutter native components in UniApp

Next, use Flutter native components in UniApp. First, go to the root directory of the UniApp application, and then execute the following command:

npm i uniapp-flutter

This will install the uniapp-flutter plug-in in the UniApp application.

5. Using Flutter native components in UniApp pages

In UniApp pages that need to use Flutter native components, use the following code example:

<template>
  <view class="container">
    <flutter-view-widget hot-reload-page="./flutterViewWidget"
                        hot-reload-image="./images/hot_reload.png"
                        @click="handleClick"/>
  </view>
</template>

<script>
  import flutterViewWidget from 'uniapp-flutter'

  export default {
    methods: {
      handleClick() {
        flutterViewWidget.showToast('Hello Flutter')
      }
    }
  }
</script>

Above In the code, we use UniApp’s view component view and embed a Flutter native component flutter-view-widget in it. By binding the @click event, we can pop up a Flutter native Toast when clicked.

4. Summary
This article introduces how to extend and use Flutter native components in UniApp to achieve richer functions and better user experience. By combining UniApp and Flutter, we can gain greater flexibility and scalability in cross-platform development. I hope this article has inspired readers and helped you better apply these two frameworks in actual projects.

Appendix: Code Example

• Flutter module code example:

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class FlutterViewWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter View Widget'),
        ),
        body: Center(
          child: RaisedButton(
            child: Text('Click Me'),
            onPressed: () {
              showToast('Hello Flutter');
            },
          ),
        ),
      ),
    );
  }

  void showToast(String message) {
    const platform = const MethodChannel('uniapp-flutter');

    try {
      platform.invokeMethod('showToast', {'message': message});
    } on PlatformException catch (e) {
      print("Failed to invoke platform method: '${e.message}'.");
    }
  }
}

• uniapp-flutter plug-in code example:

  const path = require('path')
  
  function resolve(dir) {
    return path.resolve(__dirname, dir)
  }
  
  module.exports = {
    // ...
    chainWebpack: config => {
   // ...
   config.module
     .rule('compile')
     .test(/.(vue|jsx|tsx|ts)$/)
     .include
     .add(/node_modules[\/]uniapp-flutter/) // Add this line
     .end()
     .use('babel-loader')
     .loader('babel-loader')
     .tap(options => {
       // Modify the options
       return options
     })
    }
  }

  The above is the expansion and usage guide for UniApp to implement Flutter native components. In this way, developers can use Flutter native components in UniApp to add more functions and interactive effects to cross-platform applications. In actual development, it can be more flexibly expanded and used according to specific needs. I hope this article can help readers make better use of UniApp and Flutter to develop high-quality applications.

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