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

Aananya Vyas
Aananya Vyas
20,157 Points
Posted by Aananya Vyas
Aananya Vyas
20,157 Points

For this task, make WifiLamp adopt the ColorSwitchable protocol. In the implementation of the method, simply set the col

new color?

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 {
    let state: LightState
    var color: Color
    func switchColor(color: Color) {
     //??????
    }


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

1 Answer

Greg Kaleka
Greg Kaleka
39,021 Points
Greg Kaleka
Greg Kaleka
39,021 Points

Hi Ananya,

You're so close! I agree that the wording of this challenge could be a bit more clear. What it's asking is that your implementation of the switchColor method changes the lamps color to the color passed into the method. So if the method were called switchColor(red), the lamp's color would turn red. All you need to add to your code is setting the lamp's color to the local argument name color. Also, your method signature should match the protocol's, so add in the underscore again.

Let me know if this makes sense!

solution.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 {
  let state: LightState
  var color: Color

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

  init() {
    self.state = .on
    self.color = .rgb(0,0,0,0)
  }
}
Aananya Vyas
Aananya Vyas
20,157 Points
Aananya Vyas
Aananya Vyas
20,157 Points

got it!! thanks a lot!