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

Eugene Lee
Eugene Lee
11,890 Points
Posted by 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

scribbles
scribbles
21,170 Points

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
    }
}