ApplyStyle.swift

func applyStyle() {
  StyleBuilder()
    .guide()
    .forEach { setStyle(with: $0) }
}

private func setStyle(with guide: Guide) {
  switch guide {
    case .headerLabel(let closure),
         .bodyLabel(let closure):
          perform(with: guide.identifier(), closure: closure)
    case .loginTextField(let closure):
          perform(with: guide.identifier(), closure: closure)
  }
}