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Start your free trialNapatchol Thaipanich
Courses Plus Student 13,534 PointsThe ColorSwitchable protocol needs to have a method requirement as specified in the directions.
In the editor below, I've declared a class, WifiLamp, that represents an interface to one of those Internet of Things lamps. The class models state that determines whether the lamp is on or off and a color, represented by the Color enum. For the first step, declare a protocol named ColorSwitchable. The protocol has a single requirement: a method named switchColor that takes a value of Color as an argument. For the sake of this challenge, make sure your external argument label is omitted by using an underscore. Give the argument a local name of color.
// 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
init() {
self.state = .On
self.color = .RGB(0,0,0,0)
}
func switchColor (color: Color) {
self.color = color
}
}
1 Answer
Matthew Connolly
iOS Development Techdegree Student 11,595 PointsHi Napatchol,
Protocol looks great, just a small tweak is needed! The instructions ask you to "... make sure your external argument label is omitted by using an underscore."
protocol ColorSwitchable {
func switchColor(_ color: Color)
}
More information here (Stack Overflow).
Otto linden
5,857 PointsOtto linden
5,857 PointsWhy do you need to do that? 🙂