Swift4.2

[lixiang1994]

And .podspec Add s.swift_version = "4.2" , Please

[wzio]

1 should remove .swift-version file
2 in Socket.IO-Client-Swift.podspec file should remove s.pod_target_xcconfig = { 'SWIFT_VERSION' => '4.0' }, and add s.swift_version = '4.2'

[wzio]

for the user, an other solution: add code in your podfile

post_install do |installer|
  installer.pods_project.targets.each do |target|
      if ['socket.io-client-swift'].include? target.name
          target.build_configurations.each do |config|
              config.build_settings['SWIFT_VERSION'] = '4.2'
          end
      end
  end
end