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

Maxence Roy
Maxence Roy
8,753 Points

Protocol newbie needs help!

Hey guys,

I don't know where to start with part 2 of this challenge. Could you point me in the right direction ?

protocols.swift
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) {
        return // Not sure what to put here
    }
}

1 Answer

Garrett Votaw
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Garrett Votaw
iOS Development Techdegree Graduate 15,223 Points

Hey Max,

You don't actually need to return anything from this function. A keyword to tip us off is that the requirements say to "Set the color of the lamp to the new color" so we will need to just set the lamps color property equal to the color value passed into the function.

(Note: be sure and declare self.color so that the function knows we are talking about the class that we are inside of.)

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