简介

随着跨平台技术的不断发展 , 越来越多的公司开始倾向跨平台语言去开发自己的应用。至于好处很多，主要是维护方便、节约成本。今天主要介绍一下在已有的 Swift 项目中通过 cocopod 集成(也是官方推荐的一种集成方式)嵌入Flutter模块。开发环境Xcode13.2.1 、Flutter 1.26.0-18.0.pre.185 、java 1.8.0_321。

集成

1、创建Flutter模块，这里我们新创建个取名为 my_flutter （最好在已有的Swift项目同级目录下创建）

flutter create -t module my_flutter

2、通过cocopod将创建好的Flutter模块引入Swift项目(已有Swift项目名称为：Swift_Flutter)

Podfile 文件编辑

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '10.0'
#忽略所有三方库警告⚠️
inhibit_all_warnings!
use_frameworks!
#此处根据自己Flutter项目实际路径填写
flutter_application_path = '../my_flutter'
#此句不可缺少
load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
target 'Swift_Flutter' do
  install_all_flutter_pods(flutter_application_path)
                     
end

添加好之后执行
```
pod install
```

执行结果

bogon:Swift_Flutter zhanghua$ pod install
Analyzing dependencies
Downloading dependencies
Installing Flutter (1.0.0)
Installing FlutterPluginRegistrant (0.0.1)
Installing my_flutter (0.0.1)
Generating Pods project
Integrating client project
Pod installation complete! There are 3 dependencies from the Podfile and 3 total pods         installed.
bogon:Swift_Flutter zhanghua$

到了这里是不是就成功了呢，赶紧把项目跑起来调用一下看看吧。

调用

1、在iOS Swift代码中调用 Flutter

我们将在应用启动的 app delegate 中创建一个 FlutterEngine，并作为属性暴露给外界。

import UIKit
import Flutter
import FlutterPluginRegistrant
@main
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    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.
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.rootViewController = ViewController()
        window?.makeKeyAndVisible()

        flutterEngine.run()
        GeneratedPluginRegistrant.register(with: self.flutterEngine)

        return true
    }
}

控制器中调用

 import UIKit
 import Flutter

 class ViewController: UIViewController {

     override func viewDidLoad() {
         super.viewDidLoad()
         view.backgroundColor = UIColor.brown
         // Do any additional setup after loading the view.
     }

     override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
         //搜索到了很多中获取控制器跳转的方法，感觉这种获取 控制器跳转最为流畅 （自我感觉）
         let flutterEngine = (UIApplication.shared.delegate as! AppDelegate).flutterEngine
         let flutterViewController = FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil)
         present(flutterViewController, animated: true, completion: nil)
     }
 }