XCode archive error 'No such module flutter_downloader' when using AppDelegate.swift

I can’t archive the project with XCode if I use AppDelegate.swift as stated in the docs. Both flutter run --release and flutter build ios work.

• XCode: Version 11.3.1 (11C504)

• AppDelegate.swift:

import UIKit
import Flutter
import flutter_downloader

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    FlutterDownloaderPlugin.setPluginRegistrantCallback(registerPlugins)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

private func registerPlugins(registry: FlutterPluginRegistry) {
    if (!registry.hasPlugin("FlutterDownloaderPlugin")) {
       FlutterDownloaderPlugin.register(with: registry.registrar(forPlugin: "FlutterDownloaderPlugin"))
    }
}

• flutter doctor -v:

[✓] Flutter (Channel stable, v1.12.13+hotfix.7, on Mac OS X 10.15.1 19B88, locale pt-BR)
    • Flutter version 1.12.13+hotfix.7 at /Users/JHBitencourt/Documents/
    • Framework revision 9f5ff2306b (8 weeks ago), 2020-01-26 22:38:26 -0800
    • Engine revision a67792536c
    • Dart version 2.7.0
 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/JHBitencourt/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3.1, Build version 11C504
    • CocoaPods version 1.8.4

[✓] Android Studio (version 3.5)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 41.0.2
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)

• Error:

[KarimMohamed20]

Open xcworkspace instead of xcodeproj and it will work fine

[nivla360]

None of the above solutions worked for me so this is how I solved mine:

1. Run flutter clean
2. Open the project folder navigate to ios directory and delete the ‘Pods’ folder
3. Open terminal and navigate to ios directory in your project folder and run pod install
4. When done, open ‘Runner.xcworkspace’
5. In Xcode, clean the build folder by going to Product > Clean Build Folder
6. Build the project (Product > Build) and everything should work fine.