flutter module/
└── Flutter/
    ├── Debug/
    │   ├── Flutter.xcframework
    │   ├── App.xcframework
    │   ├── FlutterPluginRegistrant.xcframework (only if you have plugins with iOS platform code)
    │   └── example_plugin.xcframework (each plugin is a separate framework)
    ├── Profile/
    │   ├── Flutter.xcframework
    │   ├── App.xcframework
    │   ├── FlutterPluginRegistrant.xcframework (only if you have plugins with iOS platform code)
    │   └── example_plugin.xcframework (each plugin is a separate framework)
    └── Release/
        ├── Flutter.xcframework
        ├── App.xcframework
        ├── FlutterPluginRegistrant.xcframework (only if you have plugins with iOS platform code)
        └── example_plugin.xcframework (each plugin is a separate framework)
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import UIKit
import Flutter
@UIApplicationMain
class AppDelegate: FlutterAppDelegate {
    lazy var flutterEngine = FlutterEngine(name: "flutter engine")
    override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        flutterEngine.run()
        return true
    }
    // MARK: UISceneSession Lifecycle
    override func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }
    override func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }
}
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import UIKit
import Flutter
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        let button = UIButton(type:UIButton.ButtonType.custom)
        button.addTarget(self, action: #selector(showFlutter), for: .touchUpInside)
        button.setTitle("Show Flutter!", for: UIControl.State.normal)
        button.frame = CGRect(x: 80.0, y: 210.0, width: 160.0, height: 40.0)
        button.backgroundColor = UIColor.blue
        self.view.addSubview(button)
    }
    @objc func showFlutter() {
        let flutterEngine = (UIApplication.shared.delegate as! AppDelegate).flutterEngine
        let flutterViewController =
            FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil)
        present(flutterViewController, animated: true, completion: nil)
      }
}
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type metadata for iostest2.AppDelegate in AppDelegate.o
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objc-class-ref in AppDelegate.o
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_OBJC_METACLASS_$__TtC8iostest211AppDelegate in AppDelegate.o
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objc-class-ref in ViewController.o
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import UIKit
import Flutter
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        let button1 = UIButton(type:UIButton.ButtonType.custom)
        button1.addTarget(self, action: #selector(showMain), for: .touchUpInside)
        button1.setTitle("show main!", for: UIControl.State.normal)
        button1.frame = CGRect(x: 80.0, y: 210.0, width: 160.0, height: 40.0)
        button1.backgroundColor = UIColor.blue
        self.view.addSubview(button1)
        let button2 = UIButton(type:UIButton.ButtonType.custom)
        button2.addTarget(self, action: #selector(showSecond), for: .touchUpInside)
        button2.setTitle("show second!", for: UIControl.State.normal)
        button2.frame = CGRect(x: 80.0, y: 310.0, width: 160.0, height: 40.0)
        button2.backgroundColor = UIColor.blue
        self.view.addSubview(button2)
    }
    @objc func showMain() {
        let flutterViewController = FlutterViewController(project: nil, initialRoute: "/", nibName: nil, bundle: nil);
        present(flutterViewController, animated: true, completion: nil)
      }
    @objc func showSecond() {
        let flutterViewController = FlutterViewController(project: nil, initialRoute: "second", nibName: nil, bundle: nil);
        present(flutterViewController, animated: true, completion: nil)
      }
}
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import UIKit
import Flutter
@UIApplicationMain
class AppDelegate: FlutterAppDelegate {
    lazy var flutterEngine1 = FlutterEngine(name: "main")
    lazy var flutterEngine2 = FlutterEngine(name: "second")
    override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        flutterEngine1.run(withEntrypoint: "main", initialRoute: "/")
        flutterEngine2.run(withEntrypoint: "main", initialRoute: "second")
        return true
    }
    // MARK: UISceneSession Lifecycle
    override func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }
    override func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }
}
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import UIKit
import Flutter
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        let button1 = UIButton(type:UIButton.ButtonType.custom)
        button1.addTarget(self, action: #selector(showMain), for: .touchUpInside)
        button1.setTitle("show main!", for: UIControl.State.normal)
        button1.frame = CGRect(x: 80.0, y: 210.0, width: 160.0, height: 40.0)
        button1.backgroundColor = UIColor.blue
        self.view.addSubview(button1)
        let button2 = UIButton(type:UIButton.ButtonType.custom)
        button2.addTarget(self, action: #selector(showSecond), for: .touchUpInside)
        button2.setTitle("show second!", for: UIControl.State.normal)
        button2.frame = CGRect(x: 80.0, y: 310.0, width: 160.0, height: 40.0)
        button2.backgroundColor = UIColor.blue
        self.view.addSubview(button2)
    }
    @objc func showMain() {
        let flutterEngine1 = (UIApplication.shared.delegate as! AppDelegate).flutterEngine1
        let flutterViewController =
            FlutterViewController(engine: flutterEngine1, nibName: nil, bundle: nil)
        present(flutterViewController, animated: true, completion: nil)
      }
    @objc func showSecond() {
        let flutterEngine2 = (UIApplication.shared.delegate as! AppDelegate).flutterEngine2
        let flutterViewController =
            FlutterViewController(engine: flutterEngine2, nibName: nil, bundle: nil)
        present(flutterViewController, animated: true, completion: nil)
      }
}
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flutterEngine.run(withEntrypoint: FlutterDefaultDartEntrypoint, initialRoute: FlutterDefaultInitialRoute)
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