This is the latest Spotify Demo written in Swift 3. I will try to keep it up to date.
I spent a while looking for this online, and I was only able to come up with bits and pieces with how fast Spotify's SDK is changing, and with Swift changing at a fast pace as well. I hope this helps out anyone else trying to add Spotify to their project, and only ask that you give me credit for my work if you use my code. I have no license attatched to my demo itself, so... enjoy!
The code still has some refining to be done. I spent a while trying to get a session to activate properly by changing the code around reducing its quality slightly. Take special note of the plist. It may have extraneous parts, but some of it will likely be necessary to get the project working.