On `Podfile`:

```ruby
flutter_application_path = '../flutter_module'
load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')

target 'OCProject' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!

  # Pods for OCProject
  # install_all_flutter_pods(flutter_application_path)
  # install_flutter_engine_pod(flutter_application_path)
  # install_flutter_application_pod(flutter_application_path)
  install_flutter_plugin_pods(flutter_application_path)

end

post_install do |installer|
  flutter_post_install(installer)
end
```
Encountering the following error after executing `pod install`:

```shell
pod install

[!] Invalid `Podfile` file: undefined method `flutter_relative_path_from_podfile' for #<Pod::Podfile:0x000000010e74c520 @defined_in_file=#<Pathname:/Users/lxf/gitHub/flutter_hybrid_bug/OCProject/Podfile>, @internal_hash={}, @root_target_definitions=[#<Pod::Podfile::TargetDefinition label=Pods>], @current_target_definition=#<Pod::Podfile::TargetDefinition label=Pods>>

  relative = flutter_relative_path_from_podfile(export_script_directory)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^.

 #  from /Users/lxf/gitHub/flutter_hybrid_bug/OCProject/Podfile:17
 #  -------------------------------------------
 #    # install_flutter_plugin_pods(flutter_application_path)
 >    install_flutter_application_pod(flutter_application_path)
 #
 #  -------------------------------------------
```

The `flutter_relative_path_from_podfile` method is in `flutter_tools/bin/podhelper.rb`, but now `flutter_tools/bin/podhelper.rb` is only required in `install_all_flutter_pods` in `podhelper.rb.tmpl`.

Sometimes we only need to use the `install_flutter_plugin_pods` method in podhelper.rb. For example, using `Shorebird` in an iOS hybird app scenario, we need to build `Flutter.xcframework` and `App.xcframework` and embed them into the iOS native project. In order to avoid unnecessary conflicts, use `install_flutter_plugin_pods` method to install Flutter plugin pods.

[Shorebird - Code Push In Hybrid Apps](https://docs.shorebird.dev/guides/hybrid-app/ios)

So I adjust the position of `require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)`.