Podfile swift version setup

Podfile

# 1
post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |configuration|
      configuration.build_settings['SWIFT_VERSION'] = "4.0"
    end
  end
end

# 2
post_install do |installer|
    installer.pods_project.targets.each do |target|
        if target.name == 'Lib'
            target.build_configurations.each do |config|
                config.build_settings['SWIFT_VERSION'] = '4.0'
            end
        end
    end
end

# 3
swift4 = ['Lib1', 'Lib2']

post_install do |installer|
    installer.pods_project.targets.each do |target|
        if swift4.include?(target.name)
            target.build_configurations.each do |config|
                config.build_settings['SWIFT_VERSION'] = '4.0'
            end
        end
    end
end