Getting firebase_core not found in iOS app after adding it into Flutter project

[yurijdvornyk]

I'm having an empty Flutter project with Firebase distribution set up.

Initially, there are no changes in pubspec.yaml, its dependencies are pasted below:

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^0.1.3

Firebase distribution is set up according to the official documentation https://firebase.google.com/docs/ios/setup#add-sdks.

Podfile has the following content:

platform :ios, '10.0'

target 'Runner' do
  use_frameworks!

  pod 'Firebase/Analytics'
  pod 'Firebase/Crashlytics'
end

At this point everything works OK, I'm able to run the app and to distribute it via Firebase.

However, I need to add Crashlytics to the Flutter project. According to Flutterfire documentation (https://firebase.flutter.dev/docs/overview#installation) to do it, I need to add firebase_core first.

After adding it to pubspec.yaml, the dependencies look like this:

dependencies:
  flutter:
    sdk: flutter

  firebase_core: "0.5.0+1"

  cupertino_icons: ^0.1.3

After adding firebase_core line, I'm not able to build my iOS app anymore.
In VSCode console I get the following output:

Launching lib/main.dart on iPhone SE (2nd generation) in debug mode...
lib/main.dart:1
Xcode build done.                                           18.9s
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **
Xcode's output:
↳
    /Users/<PATH_TO_MY_PROJECT>/ios/Runner/GeneratedPluginRegistrant.m:10:9: fatal error: module 'firebase_core' not found
    @import firebase_core;
     ~~~~~~~^~~~~~~~~~~~~
    1 error generated.
    note: Using new build system
    note: Building targets in parallel
    note: Planning build
    note: Constructing build description
Could not build the application for the simulator.
Error launching application on iPhone SE (2nd generation).

If I run the app from XCode, it shows the problem visually:

I tried to clean the project, to make pod deintegrate, pod install and to try different versions of firebase_core library, however the issue still appears.
How should I resolve it?

Pasting also the output of flutter doctor -v.

[✓] Flutter (Channel stable, 1.22.2, on Mac OS X 10.15.7 19H2, locale en-GB)
    • Flutter version 1.22.2 at /Users/<PATH_TO_FLUTTER>/flutter
    • Framework revision 84f3d28555 (11 days ago), 2020-10-15 16:26:19 -0700
    • Engine revision b8752bbfff
    • Dart version 2.10.2

 
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/<MY_USER>/Library/Android/sdk
    • Platform android-30, build-tools 30.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.0.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.0.1, Build version 12A7300
    • CocoaPods version 1.10.0

[!] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.50.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.15.1

[✓] Connected device (1 available)
    • iPhone SE (2nd generation) (mobile) • <DEVICE_ID> • ios • com.apple.CoreSimulator.SimRuntime.iOS-14-0 (simulator)

[yurijdvornyk]

UPD. Looks like I fixed the issue for myself.
If I understand everything correctly, we should not add any Flutterfire dependencies in Podfile manually. Instead, the Podfile script should look like this:

ENV['COCOAPODS_DISABLE_STATS'] = 'true'

project 'Runner', {
  'Debug' => :debug,
  'Profile' => :release,
  'Release' => :release,
}

def flutter_root
  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
  unless File.exist?(generated_xcode_build_settings_path)
    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
  end

  File.foreach(generated_xcode_build_settings_path) do |line|
    matches = line.match(/FLUTTER_ROOT\=(.*)/)
    return matches[1].strip if matches
  end
  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
end

require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)

flutter_ios_podfile_setup

target 'Runner' do
  use_frameworks!
  use_modular_headers!

  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
  end
end

At least, in my case it worked.

[alidaoud]

I am having the same issue, I tried exactly what you have mentioned but unfortunately it's not working, could you help me ?