【Flutter】iOS原生项目接入01

Flutter官网：Adding Flutter to iOS

项目结构：
Flutter模块的创建路径 务必 在 xxx.xcodeproj工程文件的上一级目录

│ occ/project/
│ ────└── test_flutter/
│ ────└── MyApp/
│ ──────── └── Podfile
flutter_app_path = '../test_flutter'

1、创建flutter项目(项目名要小写）

cd occ/project/
flutter create --template module test_flutter

2、在原生项目引入，然后执行pod install即可引入

在podfile文件中添加以下代码：

#flutter项目的相对路径
flutter_app_path = '../test_flutter'  
load File.join(flutter_app_path, '.ios', 'Flutter', 'podhelper.rb')
target 'MyApp' do
    install_all_flutter_pods(flutter_app_path)
end

3、测试，

注意启动类调整：class AppDelegate: FlutterAppDelegate {

import UIKit
import Flutter
import FlutterPluginRegistrant
import SwiftUI

@main
class AppDelegate: FlutterAppDelegate{
    
    lazy var flutterEngine = FlutterEngine(name: "Flutter Demo")

    override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Runs the default Dart entrypoint with a default Flutter route.
        flutterEngine.run();
        // Used to connect plugins (only if you have plugins with iOS platform code).
        GeneratedPluginRegistrant.register(with: self.flutterEngine);
        
        let mainTab : CCMainTabbarCtrl = CCMainTabbarCtrl.init()
        self.window = UIWindow(frame: UIScreen.main.bounds);
        self.window?.backgroundColor = UIColor.white;

        self.window?.rootViewController = mainTab;
        self.window?.makeKeyAndVisible()
        
        return super.application(application, didFinishLaunchingWithOptions: launchOptions);
      }
}

import UIKit
import Flutter

class CCMainHomeCtrl: CCBaseCtrl {

    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)
        self.navigationController?.pushViewController(flutterViewController, animated: true)
        
    }
}

运行错误提示：

Failed to find assets path for "Frameworks/App.framework/flutter_assets"
Engine run configuration was invalid
Could not launch engine with configuration.

添加脚本
target->Build Phases->+->New Run Script Phase->Run Script

"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" build
"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" embed ${SOURCE_ROOT}/Flutter/App.framework

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运行错误提示：

line 2: /packages/flutter_tools/bin/xcode_backend.sh: No such file or directory
line 3: /packages/flutter_tools/bin/xcode_backend.sh: No such file or directory

检查FLUTTER_ROOT路径是否对，如若没有，添加自己安装flutter的位置路径
target->Build Settings(若没有搜索到FLUTTER_ROOT)->+->Add User-Defined Setting

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