The first thing that strikes me as odd about your code is having the four single-character variables to represent color components. I would rather see a single drawColor variable with the UIColor type. Not only does this eliminate the need for the setColor method, but it also more easily lets u...

You can make this easier with mapping. So, let's clarify what we have. playlist.tracks - An array of "tracks" which have an id property (which is what we need). trackID - an integer representing our new track myTracks - an array of dictionaries in the form of key "id" and value being the tra...