import UIKit
import Flutter
import GoogleMaps
import flutter_local_notifications

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    // Todo: Add your API key here
    GMSServices.provideAPIKey("XXXXXXXXXXXXXXXX")

    FlutterLocalNotificationsPlugin.setPluginRegistrantCallback { (registry) in
        GeneratedPluginRegistrant.register(with: registry)
    }

    if #available(iOS 10.0, *) {
      UNUserNotificationCenter.current().delegate = self as UNUserNotificationCenterDelegate
    }
    
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

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我正在制作一个Flutter移动的应用程序，上面是我的ios/Runner/AppDelegate.swift文件。现在我需要提供它Gmap API密钥，但从另一个文件，这将是.gitignored，所以我的API密钥不发布在我的版本控制。
我在Android上做了类似的事情，将密钥存储在android/app/src/main/res/values/keys.xml下