Code style

Please follow LinkedIn's Swift style guide: https://github.com/linkedin/swift-style-guide

A couple of additions:

• In closures don't directly use weak reference to self, use this pattern instead:

guard let self = self else { return }

• For floating-point types append .0:

// PREFERRED
let width: CGFloat = 13.0

// NOT PREFERRED
let width: CGFloat = 13