• Add Flutter to your machine
• Open this project folder with Terminal/CMD
• Ensure there's no cache/build leftover by running flutter clean in the Terminal
• Run in the Terminal flutter packages get
• Run in the Terminal flutter packages pub run build_runner build --delete-conflicting-outputs

• Open ios folder inside Terminal/CMD
• Run in the Terminal pod install
• Run in the Terminal pod update

• Open Android Emulator or iOS Simulator
• Run flutter run --flavor {RELEASE_TYPE}
• Supported release type: development, staging, and production

• Run flutter build apk --flavor {RELEASE_TYPE}
• The apk will be saved under this location: [project]/build/app/outputs/flutter-apk/
• We can also build appbundle (.aab) by running this command: flutter build appbundle --flavor {RELEASE_TYPE}

• Follow the tutorial from this link: https://flutter.dev/docs/deployment/ios#create-a-build-archive-with-xcode
• Don't forget to add the release type behind the build command
• For example flutter build ipa --flavor {RELEASE_TYPE}

For more information, check out the official documentation