Swift code added to update the background color of the view to the slider values

ColorSliders_updateView.swift

    override func viewDidLoad() {
        super.viewDidLoad()
        redSlider.value = 0.71
        greenSlider.value = 0.04
        blueSlider.value = 0.22
        alphaSlider.value = 1.0
        updateView()
    }

    func updateView() {
        println("Red: \(redSlider.value) Green: \(greenSlider.value)  Blue: \(blueSlider.value)  Alpha: \(alphaSlider.value)")

        redLabel.text = String(format: "%.2f", redSlider.value)
        greenLabel.text = String(format: "%.2f", greenSlider.value)
        blueLabel.text = String(format: "%.2f", blueSlider.value)
        alphaLabel.text = String(format: "%.2f", alphaSlider.value)

        colorView.backgroundColor = UIColor(
            red: CGFloat(redSlider.value),
            green: CGFloat(greenSlider.value),
            blue: CGFloat(blueSlider.value),
            alpha: CGFloat(alphaSlider.value))
    }