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iOS Swift 2.0 Protocols Swift 2.0 Protocols Protocols With Methods

Preview not working. Am i not assigning color right?

Will not let me preview errors? Could someone tell me how to fix this?

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)
  {
  self.color = .RBG(1,1,1,1)
  }

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