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1.创建flutter module
进入iOS工程根目录的上一级，创建flutter module工程

flutter create --template module fluttermodule

2.进入iOS工程根目录，编辑podfile文件

flutter_application_path = '../fluttermodule'
load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')

target "iOSDemo" do

use_frameworks!
install_all_flutter_pods(flutter_application_path)

end

post_install do |installer|
  flutter_post_install(installer) if defined?(flutter_post_install)
end

执行pod install
3.iOS调用Flutter
在AppDelegate注册FlutterEngine

import UIKit
import Flutter
import FlutterPluginRegistrant

@main
class AppDelegate: UIResponder, UIApplicationDelegate {
    lazy var flutterEngine = FlutterEngine(name: "my flutter engine")
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        GeneratedPluginRegistrant.register(with: self.flutterEngine);
        flutterEngine.run()
        return true
    }
}

使用 FlutterEngine调用utterViewController

import UIKit
import Flutter

class ViewController: UIViewController {
  override func viewDidLoad() {
    super.viewDidLoad()

    // Make a button to call the showFlutter function when pressed.
    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)
  }
}

参考链接
https://www.jianshu.com/p/aac1f387f3c0
https://www.jianshu.com/p/c3e5e210a585