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

Protocol code challenge method implementation to change new color

What am I doing wrong when implementiong method to change color conforming to interface?

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: ColorSwitchable {
  func switchColor(_ color: Color) {
    color = Color.rgb(1,1,1,1)
  }

  let state: LightState
  var color: Color

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

1 Answer

Ryan Lee
Ryan Lee
13,806 Points

Hi Noe,

Looks like the only thing you need to change is where you are assigning color in the method. self.color = color is what you're looking for, because we want to set the color property of the class with the argument passed in which should already be a Color object.

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: Color) {
     self.color = color
  }
}

Hi Ryan,

That makes sense. Thanks for your assistance.

Noe