Podfile post-install script for best-practice code signing settings.

gistfile1.txt

post_install do |installer_representation|
    installer_representation.pods_project.targets.each do |target|
            target.build_configurations.each do |config|
                if config.to_s == 'Beta'
                    config.build_settings['CODE_SIGN_IDENTITY[sdk=iphoneos*]'] = 'iPhone Distribution'
                elsif config.to_s == 'Release'
                    config.build_settings['CODE_SIGN_IDENTITY[sdk=iphoneos*]'] = 'iPhone Distribution'
                end
            end
    end
end

The default provisioning profile selection Automatic is acceptable so I leave that untouched.

Known Issue: It is not possible to specify a particular code signing identity when your project uses different distribution identities depending on the current scheme/config. Alas, we must fallback to trusting that Xcode will select the appropriate identity from the pool of distribution identities.

Shout out to @traviscrist for how to construct a post_install script this way. CocoaPods/CocoaPods#3811