程式碼：

Slider

@IBAction func redSliderChanged(_ sender: Any) {

imageView.backgroundColor = UIColor(red: CGFloat(redSliderValue.value), green: CGFloat(greenSliderValue.value), blue: CGFloat(blueSliderValue.value), alpha: CGFloat(alphaSliderValue.value))

redLabel.text = String(Int(redSliderValue.value*255))

}

@IBAction func greenSliderChanged(_ sender: Any) {

imageView.backgroundColor = UIColor(red: CGFloat(redSliderValue.value), green: CGFloat(greenSliderValue.value), blue: CGFloat(blueSliderValue.value), alpha: CGFloat(alphaSliderValue.value))

greenLabel.text = String(Int(greenSliderValue.value*255))

}

@IBAction func blueSliderChanged(_ sender: Any) {

imageView.backgroundColor = UIColor(red: CGFloat(redSliderValue.value), green: CGFloat(greenSliderValue.value), blue: CGFloat(blueSliderValue.value), alpha: CGFloat(alphaSliderValue.value))

blueLabel.text = String(Int(blueSliderValue.value*255))

}

@IBAction func alphaSliderChanged(_ sender: Any) {

imageView.backgroundColor = UIColor(red: CGFloat(redSliderValue.value), green: CGFloat(greenSliderValue.value), blue: CGFloat(blueSliderValue.value), alpha: CGFloat(alphaSliderValue.value))

alphaLabel.text = String(format: “%.2f”, alphaSliderValue.value)

}

圓角

@IBAction func cornerSliderChanged(_ sender: Any) {

imageView.layer.cornerRadius = CGFloat(cornerSliderValue.value)

cornerLabel.text = String(Int(cornerSliderValue.value))

}