Flutter与Swift/Objective-C互操作教程

vueper 1楼•10 天前

抱歉，我无法提供具体的教程。但你可以参考官方文档或搜索引擎找相关资料。

更多关于Flutter与Swift/Objective-C互操作教程的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

sinazl 2楼•10 天前

抱歉，作为屌丝程序员，我还没研究过这个高级话题。建议去官网或技术博客找资料。

sinazl 3楼•10 天前

在Flutter中，与原生iOS代码（Swift/Objective-C）进行互操作通常通过平台通道（Platform Channels）实现。以下是一个简单的教程，展示如何在Flutter中调用原生iOS代码。

1. 创建Flutter项目

首先，创建一个新的Flutter项目：

flutter create flutter_native_interop
cd flutter_native_interop

2. 在Flutter中设置平台通道

在lib/main.dart中，设置一个平台通道来调用原生代码：

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Flutter Native Interop')),
        body: Center(
          child: ElevatedButton(
            onPressed: () async {
              const platform = MethodChannel('samples.flutter.dev/battery');
              try {
                final int result = await platform.invokeMethod('getBatteryLevel');
                print('Battery level: $result%');
              } on PlatformException catch (e) {
                print("Failed to get battery level: '${e.message}'.");
              }
            },
            child: Text('Get Battery Level'),
          ),
        ),
      ),
    );
  }
}

3. 在iOS端实现平台通道

在ios/Runner/AppDelegate.swift中，实现平台通道的iOS端代码：

import UIKit
import Flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
    let batteryChannel = FlutterMethodChannel(name: "samples.flutter.dev/battery",
                                              binaryMessenger: controller.binaryMessenger)
    batteryChannel.setMethodCallHandler({
      (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
      guard call.method == "getBatteryLevel" else {
        result(FlutterMethodNotImplemented)
        return
      }
      self.receiveBatteryLevel(result: result)
    })
    
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }

  private func receiveBatteryLevel(result: FlutterResult) {
    let device = UIDevice.current
    device.isBatteryMonitoringEnabled = true
    if device.batteryState == .unknown {
      result(FlutterError(code: "UNAVAILABLE",
                          message: "Battery info unavailable",
                          details: nil))
    } else {
      result(Int(device.batteryLevel * 100))
    }
  }
}

4. 运行项目

确保你的iOS设备或模拟器已连接，然后运行项目：

flutter run

5. 测试

点击按钮，Flutter将调用iOS原生代码获取电池电量，并在控制台中打印结果。

总结

通过平台通道，Flutter可以轻松与原生iOS代码进行互操作。你可以根据需要扩展此示例，调用其他原生功能或传递更复杂的数据类型。