colors changer

gistfile1.swift

let colors = [UIColor.turquoiseColor(),
UIColor.greenSeaColor(),
UIColor.emerlandColor(),
UIColor.nephritisColor(),
UIColor.peterRiverColor(),
UIColor.belizeHoleColor(),
UIColor.amethystColor(),
UIColor.wisteriaColor(),
UIColor.midnightBlueColor(),
UIColor.sunflowerColor(),
UIColor.tangerineColor(),
UIColor.carrotColor(),
UIColor.pumpkinColor(),
UIColor.alizarinColor(),
UIColor.pomegranateColor(),
UIColor.cloudsColor(),
UIColor.silverColor(),
UIColor.concreteColor(),
UIColor.asbestosColor()]  
  override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    self.view.backgroundColor = colors[index]
    println(index)
    index++
    if(index == 20) {
      index = 0
    }
  }