Create Flutter Plugin with pod dependencies - flutter

Question

I created a flutter plugin with "FacebookShare" dependency.
My pod spec like below,
Pod::Spec.new do |s|
s.name = '{plugin name}'
s.version = '0.0.2'
s.summary = 'A new Flutter plugin for share image and text in social media'
s.description = <<-DESC A new Flutter plugin for share image and text in social media
DESC
s.homepage = 'https://github.com/jayarajm/flutter_share_social_media.git'
s.license = { :file => '../LICENSE' }
s.author = { '...' => '...' }
s.source = { :path => '.' }
s.source_files = 'Classes/**/*'
s.public_header_files = 'Classes/**/*.h'
s.dependency 'Flutter'
s.dependency 'FacebookShare'
s.ios.deployment_target = '8.0'
s.static_framework = true
end
In the sample project, the plugin refers to a local path. So I didn't receive any problem to install pod or run the project.
After publish into "https://pub.dartlang.org/".
I try to use from dart packages in my project, I received a problem in installing pod. I attached the error below,
CocoaPods' output:
↳
Preparing
Analyzing dependencies
Inspecting targets to integrate
Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)
Fetching external sources
-> Fetching podspec for `Flutter` from `.symlinks/flutter/ios`
-> Fetching podspec for `flutter_share_social_media` from `.symlinks/plugins/flutter_share_social_media/ios`
Resolving dependencies of `Podfile`
Comparing resolved specification to the sandbox manifest
A Bolts
A FBSDKCoreKit
A FBSDKShareKit
A FacebookCore
A FacebookShare
A Flutter
A flutter_share_social_media
Downloading dependencies
-> Installing Bolts (1.9.0)
> Copying Bolts from `/Users/jayaraj_m/Library/Caches/CocoaPods/Pods/Release/Bolts/1.9.0-ac656` to `Pods/Bolts`
-> Installing FBSDKCoreKit (4.40.0)
> Copying FBSDKCoreKit from `/Users/jayaraj_m/Library/Caches/CocoaPods/Pods/Release/FBSDKCoreKit/4.40.0-ae214` to `Pods/FBSDKCoreKit`
-> Installing FBSDKShareKit (4.40.0)
> Copying FBSDKShareKit from `/Users/jayaraj_m/Library/Caches/CocoaPods/Pods/Release/FBSDKShareKit/4.40.0-0e459` to `Pods/FBSDKShareKit`
-> Installing FacebookCore (0.5.0)
> Copying FacebookCore from `/Users/jayaraj_m/Library/Caches/CocoaPods/Pods/Release/FacebookCore/0.5.0-74288` to `Pods/FacebookCore`
-> Installing FacebookShare (0.5.0)
> Copying FacebookShare from `/Users/jayaraj_m/Library/Caches/CocoaPods/Pods/Release/FacebookShare/0.5.0-963b4` to `Pods/FacebookShare`
-> Installing Flutter (1.0.0)
-> Installing flutter_share_social_media (0.0.2)
- Running pre install hooks
[!] The following Swift pods cannot yet be integrated as static libraries:
The Swift pod `FacebookCore` depends upon `Bolts` and `FBSDKCoreKit`, which do not define modules. To opt into those targets generating module maps (which is necessary to import them from Swift when building as static libraries), you may set `use_modular_headers!` globally in your Podfile, or specify `:modular_headers => true` for particular dependencies.
The Swift pod `FacebookShare` depends upon `Bolts`, `FBSDKCoreKit`, and `FBSDKShareKit`, which do not define modules. To opt into those targets generating module maps (which is necessary to import them from Swift when building as static libraries), you may set `use_modular_headers!` globally in your Podfile, or specify `:modular_headers => true` for particular dependencies.
The Swift pod `flutter_share_social_media` depends upon `Bolts`, `FBSDKCoreKit`, and `FBSDKShareKit`, which do not define modules. To opt into those targets generating module maps (which is necessary to import them from Swift when building as static libraries), you may set `use_modular_headers!` globally in your Podfile, or specify `:modular_headers => true` for particular dependencies.
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.3/lib/cocoapods/installer/xcode/target_validator.rb:135:in `verify_swift_pods_have_module_dependencies'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.3/lib/cocoapods/installer/xcode/target_validator.rb:38:in `validate!'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.3/lib/cocoapods/installer.rb:415:in `validate_targets'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.3/lib/cocoapods/installer.rb:118:in `install!'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.3/lib/cocoapods/command/install.rb:41:in `run'
/usr/local/lib/ruby/gems/2.5.0/gems/claide-1.0.2/lib/claide/command.rb:334:in `run'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.3/lib/cocoapods/command.rb:52:in `run'
/usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.3/bin/pod:55:in `<top (required)>'
/usr/local/bin/pod:23:in `load'
/usr/local/bin/pod:23:in `<main>'
Error output from CocoaPods:
↳
[!] `<PBXGroup UUID=`97C146E51CF9000F007C117D`>` attempted to initialize an object with an unknown UUID. `CF3B75C9A7D2FA2A4C99F110` for attribute: `children`. This can be the result of a merge and the unknown UUID is being discarded.
[!] Automatically assigning platform `ios` with version `8.0` on target `Runner` because no platform was specified. Please specify a platform for this target in your Podfile. See `https://guides.cocoapods.org/syntax/podfile.html#platform`.

Answer 1

I'd a similar problem, with the same output <PBXGroup UUID..., in my case when I ran pod install --verbose I realize that there was an specific error during pod install
undefined method `each_child' for #Dir:0x00007ff10befa7f0 Did you mean? each_slice
Looking for this specific error I found this answer and I realize that I was using ruby 2.5 and one file generated by Flutter for iOS devices was trying to use a method that was introduced on version 2.6.
After follow the steps on that answer I could run my Flutter app on iOS simulator.
The method dir.each_child was introduced in Ruby 2.6, but you are using Ruby 2.3.0.
You should update Ruby to 2.6.0 or later 2.x version.
After Ruby updating you may also need to restart your IDE and re-install cocoapods.