Q: Firebase setup on iOS (Flutter) I'm trying to setup Firebase on iOS in Flutter by following the original guide, but I get the following message after typing pod install in the terminal:
[!] CocoaPods could not find compatible versions for pod "Firebase/Auth":
  In snapshot (Podfile.lock):
    Firebase/Auth (= 6.34.0, ~> 6.0)

  In Podfile:
    firebase_auth (from `.symlinks/plugins/firebase_auth/ios`) was resolved to 1.4.1, which depends on
      Firebase/Auth (= 8.0.0)


You have either:
 * out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.
 * changed the constraints of dependency `Firebase/Auth` inside your development pod `firebase_auth`.
   You should run `pod update Firebase/Auth` to apply changes you've made.

All I changed in the main.dart file is that I changed the default main function to this:
    Future main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp();
      runApp(MyApp());
    }

My pubspec.yaml file's relevant part looks like this:

    firebase_storage: ^8.0.3
    cloud_firestore: ^1.0.5
    firebase_auth: ^1.1.0


I choose these numbers based on a video that used null safety, but tried it with several different ones too like the ones that are mentioned here:
https://firebase.google.com/docs/flutter/setup#analytics-enabled, and also the latest ones, but the error was the same.
I tried reinstalling cocoapods and did the pod repo update, pod setup, pod install multiple times but the output was the same. In the Podfile, I uncommented the ios version number and changed it to 10 as many sources recommended.
I would appreciate your help on this one.
EDIT:
This was my original Podfile:
    # Uncomment this line to define a global platform for your project
    platform :ios, '10.0'
    
    # CocoaPods analytics sends network stats synchronously affecting flutter build latency.
    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


SOLUTION:
I changed my Podfile to this:

    platform :ios, '12.0'
    
    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
    
    def flutter_install_ios_plugin_pods(ios_application_path = nil)
      ios_application_path ||= File.dirname(defined_in_file.realpath) if self.respond_to?(:defined_in_file)
      raise 'Could not find iOS application path' unless ios_application_path
    
      symlink_dir = File.expand_path('.symlinks', ios_application_path)
      system('rm', '-rf', symlink_dir) # Avoid the complication of dependencies like FileUtils.
    
      symlink_plugins_dir = File.expand_path('plugins', symlink_dir)
      system('mkdir', '-p', symlink_plugins_dir)
    
      plugins_file = File.join(ios_application_path, '..', '.flutter-plugins-dependencies')
      plugin_pods = flutter_parse_plugins_file(plugins_file)
      plugin_pods.each do |plugin_hash|
        plugin_name = plugin_hash['name']
        plugin_path = plugin_hash['path']
        if (plugin_name && plugin_path)
          symlink = File.join(symlink_plugins_dir, plugin_name)
          File.symlink(plugin_path, symlink)
    
          if plugin_name == 'flutter_ffmpeg'
              pod 'flutter_ffmpeg/full-lts', :path => File.join('.symlinks', 'plugins', plugin_name, 'ios')
          else
              pod plugin_name, :path => File.join('.symlinks', 'plugins', plugin_name, 'ios')
          end
        end
      end
    end
    
    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)
        target.build_configurations.each do |config|
            config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '10.0'
        end
      end
    end



A: This is my current Podfile setup, you might want to try it:
platform :ios, '12.0'

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

def flutter_install_ios_plugin_pods(ios_application_path = nil)
  ios_application_path ||= File.dirname(defined_in_file.realpath) if self.respond_to?(:defined_in_file)
  raise 'Could not find iOS application path' unless ios_application_path

  symlink_dir = File.expand_path('.symlinks', ios_application_path)
  system('rm', '-rf', symlink_dir) # Avoid the complication of dependencies like FileUtils.

  symlink_plugins_dir = File.expand_path('plugins', symlink_dir)
  system('mkdir', '-p', symlink_plugins_dir)

  plugins_file = File.join(ios_application_path, '..', '.flutter-plugins-dependencies')
  plugin_pods = flutter_parse_plugins_file(plugins_file)
  plugin_pods.each do |plugin_hash|
    plugin_name = plugin_hash['name']
    plugin_path = plugin_hash['path']
    if (plugin_name && plugin_path)
      symlink = File.join(symlink_plugins_dir, plugin_name)
      File.symlink(plugin_path, symlink)

      if plugin_name == 'flutter_ffmpeg'
          pod 'flutter_ffmpeg/full-lts', :path => File.join('.symlinks', 'plugins', plugin_name, 'ios')
      else
          pod plugin_name, :path => File.join('.symlinks', 'plugins', plugin_name, 'ios')
      end
    end
  end
end

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


A: I had a the same problem solved it simply by changing target to platform :ios, '14.0' in Podfile
then in your project cd ios to your iOS folder - run :

*

*rm -rf Pods/ Podfile.lock


*pod repo update


*pod install
for M1 Mac Users - run this instead :

*

*rm -rf Pods/ Podfile.lock


*sudo arch -x86_64 gem install ffi


*arch -x86_64 pod repo update


*pod install
error should be gone
--
But you might then be left with this last error :
[!] CocoaPods did not set the base configuration of your project because your project already has a custom config set. In order for CocoaPods integration to work at all, please either set the base configurations of the target `Runner` to `Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig` or include the `Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig` in your build configuration (`Flutter/Release.xcconfig`).

Set configurations in Xcode as showed in this StackOverFlow Answer  to solve it

A: Can you try adding those lines at the end of your Podfile:
pod 'Firebase/Auth'
pod 'Firebase/Firestore'
pod 'Firebase/Storage'

You can check the full list of Firebase pods here: https://firebase.google.com/docs/ios/setup
Alternatively, you can add them like:
 pod 'FirebaseFirestore', :git => 'https://github.com/invertase/firestore-ios-sdk-frameworks.git', :tag => '8.0.0'

where you can directly link to GitHub repo and version(tag) you want to take, maybe playing around with versions will solve it.
Also, you might try deleting your Podfile.lock and then running pod install.
