SimpleCheckbox aims to accomplish what other ios checkbox controls haven't. To be simple. There's no animations, no IBDesignable to slow down interface builder, and no performance heavy draw methods.
SwiftyGuitarGhords is a Swift library that can generate CAShapeLayers for any chord within it's database. All you need to do is supply a Key (C, C#, etc) and a suffix (Major, Minor, etc) to find the appropriate chord. Each chord comes with a few variants.
Mustud