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iOS Protocols in Swift Protocol Basics Protocols With Methods

callum obrien
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.a{fill-rule:evenodd;}techdegree
callum obrien
iOS Development Techdegree Student 2,812 Points
Posted by callum obrien
.a{fill-rule:evenodd;}techdegree
callum obrien
iOS Development Techdegree Student 2,812 Points

Code is not working

Im not sure why i keep getting an error. Can someone please help! thanks

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) {
        self.color = color
    }
}
Halil Bayrakci
Halil Bayrakci
3,884 Points

your code is right but the challenge specifically wants your argument underscored :)

For the sake of this challenge, make sure your external argument label is omitted by using an underscore.

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

1 Answer

Luca Di Michele
Luca Di Michele
3,309 Points
Luca Di Michele
Luca Di Michele
3,309 Points

Simply, the challenge didn't ask you to conform the class WifiLamp to the protocol ColorSwitchable. So, if you clean that part and, as already pointed out by Halil Bayrakci, you fix the method switchColor omitting the first label, it will work.

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)
    }
}