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我正在努力将 Flutter 模块集成到 Swift 应用程序中。我遵循了 Flutter 文档（将 Flutter 模块集成到您的 iOS 项目中），并尝试了所有三个选项，但不幸的是只有选项 A（嵌入 CocoaPods 和 Flutter SDK）有效，这是我唯一不能的选项使用，因为它会暴露我的源代码（我不能）。目前我已经尝试最小化代码，但仍然无法正常工作。

2021-04-15 19:12:55.694052-0300 libertyModuleIOS[78482:2330559] Failed to find snapshot: /Users/user/Library/Developer/CoreSimulator/Devices/34DB7C2C-0AF9-4F97-B94A-125550BB4806/data/Containers/Bundle/Application/8623C44A-A239-44C7-8474-5765E77BD28B/libertyModuleIOS.app/Frameworks/App.framework/flutter_assets/kernel_blob.bin
2021-04-15 19:12:55.694815-0300 libertyModuleIOS[78482:2330559] Metal API Validation Enabled
2021-04-15 19:12:55.772496-0300 libertyModuleIOS[78482:2331070] [VERBOSE-2:engine.cc(182)] Engine run configuration was invalid.
2021-04-15 19:12:55.772980-0300 libertyModuleIOS[78482:2331070] [VERBOSE-2:shell.cc(571)] Could not launch engine with configuration.
2021-04-15 19:12:56.148194-0300 libertyModuleIOS[78482:2331083] flutter: Observatory listening on http://127.0.0.1:57253/9vJInMBBG9w=/

有趣的是，在我的物理设备（Iphone SE）上它运行良好，但是当我将它上传到 TestFlight 或尝试在模拟器上运行它（甚至在 iPhone SE 上）时，它不起作用，并显示上面的错误（当然只在模拟器上）。顺便说一句，我不使用 CocoaPods 来生成代码（我已经尝试将它与第三个选项一起使用，但是“出来”了同样的问题）。

我使用的 Swift 代码与 Flutter 文档中的完全相同。


AppDelegate.swift

import UIKit
import Flutter
// Used to connect plugins (only if you have plugins with iOS platform code).
import FlutterPluginRegistrant

@UIApplicationMain
class AppDelegate: FlutterAppDelegate { // More on the FlutterAppDelegate.
  lazy var flutterEngine = FlutterEngine(name: "my flutter engine")

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


ViewController.swift

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)
  }
}
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