Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Protocols in Swift Protocol Basics Protocols With Methods

Eugene Lee
Eugene Lee
11,890 Points

this Wifi lamp quiz is impossible. all of posted solutions are failed to pass. do you have any idea. i am about to quit

func switchColor(_ color: Color) { self. color = color } don't pass WiFi Lamp quiz. do you know why? thanks

protocols.swift
// 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 {
  let state: LightState
  var color: Color

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

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

2 Answers

Make sure you declare the protocol for the WifiLamp class to implement, in this case it should be

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

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

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