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iOS Swift 2.0 Protocols Swift 2.0 Protocols Protocols With Methods

Jeff Ripke
Jeff Ripke
41,989 Points

Where am I going wrong here?

What do I put in the body of switchColor?

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

    init() {
        self.state = .On
        self.color = .RGB(0,0,0,0)
    }

    func switchColor(color: Color) {

    }
}

1 Answer

Nathan Tallack
Nathan Tallack
22,160 Points

You have done great! You were very close. All that was missing was taking the parameter passed into that function and assigning it to the self.color value. This will allow you to use that method on the object to change its color in the future. This is because the practice is not to set the properties on an object directly but to set them using a method, as the protocol you defined requires.

See your code below with the missing line.

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