三個(gè)滑竿代表紅綠藍(lán),修改view的顏色

import UIKit


class ViewController: UIViewController {

    var redSlider : UISlider! = nil
    var greenSlider : UISlider! = nil
    var blueSlider : UISlider! = nil
    override func viewDidLoad() {
        super.viewDidLoad()
        
        redSlider = UISlider(frame: CGRect(x: 100, y: 150, width: 200, height: 40))
        self.view.addSubview(redSlider)
        redSlider.minimumValue = 0;
       redSlider.maximumValue = 255;
       redSlider.addTarget(self, action: #selector(sliderAction(slider:)), for: .valueChanged)
        
         greenSlider = UISlider(frame: CGRect(x: 100, y: 250, width: 200, height: 40))
        self.view.addSubview(greenSlider)
        greenSlider.minimumValue = 0;
        greenSlider.maximumValue = 255;
        greenSlider.addTarget(self, action: #selector(sliderAction(slider:)), for: .valueChanged)
        blueSlider = UISlider(frame: CGRect(x: 100, y: 350, width: 200, height: 40))
        self.view.addSubview(blueSlider)
        blueSlider.minimumValue = 0;
       blueSlider.maximumValue = 255;
      blueSlider.addTarget(self, action: #selector(sliderAction(slider:)), for: .valueChanged)
        
        redSlider.thumbTintColor = UIColor.red
        blueSlider.thumbTintColor = UIColor.blue
        greenSlider.thumbTintColor = UIColor.green
    }
    
    func  sliderAction(slider:UISlider) {
        self.view.backgroundColor = UIColor(red:CGFloat(self.redSlider.value) / 255.0, green: CGFloat(self.greenSlider.value) / 255.0, blue: CGFloat(self.blueSlider.value) / 255.0, alpha: 1) ;
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}