How to define the swift version for a specific pod in a Podfile

Try This

# Uncomment the next line to define a global platform for your project
    # platform :ios, '9.0'

    target 'MyApp' do
      # Comment the next line if you're not using Swift and don't want to use dynamic frameworks
      use_frameworks!

      # Pods for MyApp

      pod 'SideMenuController', '~> 0.2.4'
      pod 'Alamofire', '~> 4.6.0'


    end
    post_install do |installer|
        installer.pods_project.targets.each do |target|
            target.build_configurations.each do |config|
                config.build_settings['SWIFT_VERSION'] = '3.0'
            end
        end
    end

post_install do |installer|
        installer.pods_project.build_configurations.each do |config|
            config.build_settings.delete('CODE_SIGNING_ALLOWED')
            config.build_settings.delete('CODE_SIGNING_REQUIRED')
        end
        installer.pods_project.targets.each do |target|
            if ['SideMenuController'].include? target.name
                target.build_configurations.each do |config|
                    config.build_settings['SWIFT_VERSION'] = '3.0'
                end
            end
        end
end