Using Library Code with a Swift Playground

I had code that I wanted to treat as a library and import it into my Swift Playground. It took several hours of searching and experimenting until I came up with a recipe that worked. There may be easier, better ways to do this, but this is what worked for me on Xcode 6.1:

1. Create a workspace.
2. Add a new Cocoa Framework project to the workspace.
3. Add a Swift file to the framework project.
4. Remove Foundation.h file from the framework.
5. Build the framework.
6. Add a playground to the project (not the workspace).
7. In the playground, add code to import the framework.

Now you can use your imported framework/library in the playground. Just add the library code to the framework (using the file in step 3 and adding other files as needed) and build the project. You can then access the public members in the framework.