In Swift, “Modules” refers to Frameworks. Xcode now has a template for creating a framework project for both iOS and OS X.
There is currently no way to declare methods or properties public / protected. If you would like to see this added as a feature, you can make a feature request on Apple’s bug reporter. It should also be noted that Apple has stated that the language could change with each release of Xcode, so it is possible that member access levels could be added before the public release.