Have dependencies that support Swift 3.0 & Swift 4.0 and work seamlessly together. ✨

podfile

swift4Targets = ['Target-1','Target-2','Target-3']
post_install do |installer|
    installer.pods_project.targets.each do |target|
        target.build_configurations.each do |config|
            if swift4Targets.include? target.name
                config.build_settings['SWIFT_VERSION'] = '4'
            else
                config.build_settings['SWIFT_VERSION'] = '3.2'
            end
        end
    end
end