iOS

[calcitem]

import UIKit
import Flutter

@UIApplicationMain
class AppDelegate: FlutterAppDelegate {
  var flutterEngine: FlutterEngine?

  override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    flutterEngine = FlutterEngine(name: "my_engine", project: nil)
    flutterEngine?.run(withEntrypoint: nil)

    let channel = FlutterMethodChannel(name: "my_channel", binaryMessenger: flutterEngine!.binaryMessenger)
    channel.setMethodCallHandler { (call: FlutterMethodCall, result: @escaping FlutterResult) in
      // Handle method call from Flutter.
      if call.method == "startup" {
        let result = engine.startup()
        result(result)
      } else if call.method == "send" {
        let str = call.arguments as! String
        let result = engine.send(str)
        result(result)
      } else if call.method == "read" {
        let result = engine.read()
        result(result)
      } else if call.method == "shutdown" {
        let result = engine.shutdown()
        result(result)
      } else if call.method == "isReady" {
        let result = engine.isReady()
        result(result)
      } else if call.method == "isThinking" {
        let result = engine.isThinking()
        result(result)
      } else {
        result(FlutterMethodNotImplemented)
      }
    }

    GeneratedPluginRegistrant.register(with: flutterEngine)

    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

[calcitem]

macos

D:\Repo\Sanmill\src\ui\flutter_app\macos\Runner.xcodeproj\project.pbxproj

/* Begin PBXSourcesBuildPhase section */
		33CC10E92044A3C60003C045 /* Sources */ = {
			isa = PBXSourcesBuildPhase;
			buildActionMask = 2147483647;
			files = (
				33CC11132044BFA00003C045 /* MainFlutterWindow.swift in Sources */,
				33CC10F12044A3C60003C045 /* AppDelegate.swift in Sources */,
				335BBD1B22A9A15E00E9071D /* GeneratedPluginRegistrant.swift in Sources */,
			);
			runOnlyForDeploymentPostprocessing = 0;
		};