Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Protocols in Swift Protocol Basics Protocols With Methods

Maarten De Kruif
Maarten De Kruif
7,314 Points

can't fix the protocol ColorSwitchable, anybody for help

I hope someone can help me. Thanks in advance.

// Declare protocol here
protocol ColorSwitchable {
func switchColor(_ color: Color)

enum LightState {
  case on, off

enum Color {
  case rgb(Double, Double, Double, Double)
  case hsb(Double, Double, Double, Double)

class WifiLamp: ColorSwitchable {
  let state: LightState
  var color: Color

  init() {
    self.state = .on
    self.color = .rgb(0,0,0,0)

  func switchColor(_ : color)


1 Answer

Jorge Solana
Jorge Solana
6,064 Points

Hey Maarten!

There's a piece of the challenge text that your code is missing. "In the implementation of the method, simply set the color of the lamp to the new color."

  func switchColor(_ color: Color) {
    self.color = color

Hope it helps!