从Flutter打开安卓Activity和iOS ViewController

import 'package:flutter/services.dart';

class FlutterOpenNative {
  static const MethodChannel _channel =
      const MethodChannel('flutter_open_native');

  static Future<void> openAndroidActivity() async {
    await _channel.invokeMethod('openAndroidActivity');
  }

  static Future<void> openiOSViewController() async {
    await _channel.invokeMethod('openiOSViewController');
  }
}

import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugin.common.MethodChannel;

public class MainActivity extends FlutterActivity {
    private static final String CHANNEL = "flutter_open_native";

    @Override
    public void configureFlutterEngine(FlutterEngine flutterEngine) {
        super.configureFlutterEngine(flutterEngine);

        new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
                .setMethodCallHandler((call, result) -> {
                    if (call.method.equals("openAndroidActivity")) {
                        openAndroidActivity();
                        result.success(null);
                    } else {
                        result.notImplemented();
                    }
                });
    }

    private void openAndroidActivity() {
        // 打开安卓Activity的逻辑
    }
}

import Flutter
import UIKit

public class ViewController: FlutterViewController {
    private let CHANNEL = "flutter_open_native"

    override public func viewDidLoad() {
        super.viewDidLoad()

        let methodChannel = FlutterMethodChannel(name: CHANNEL, binaryMessenger: self.binaryMessenger)
        methodChannel.setMethodCallHandler { [weak self] (call, result) in
            if call.method == "openiOSViewController" {
                self?.openiOSViewController()
                result(nil)
            } else {
                result(FlutterMethodNotImplemented)
            }
        }
    }

    private func openiOSViewController() {
        // 打开iOS ViewController的逻辑
    }
}