import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame:UIScreen.main.bounds)
self.window?.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
self.window?.makeKeyAndVisible()
self.window?.rootViewController = ViewController()
return true
}
}
class ViewController: UIViewController {
// 懒加载创建三个slider
lazy var redSlider:UISlider = {
let r = UISlider(frame:CGRect(x: 20, y: 200, width: 374, height: 30))
return r
}()
lazy var greenSlider:UISlider = {
let g = UISlider(frame:CGRect(x: 20, y: 250, width: 374, height: 30))
return g
}()
lazy var blueSlider: UISlider={
let b = UISlider(frame:CGRect(x: 20, y: 300, width: 374, height: 30))
return b
}()
override func viewDidLoad() {
super.viewDidLoad()
// 控制背景颜色的slider
self.view.addSubview(redSlider)
self.view.addSubview(greenSlider)
self.view.addSubview(blueSlider)
// 设置滑块的颜色
redSlider.thumbTintColor = UIColor.red
greenSlider.thumbTintColor = UIColor.green
blueSlider.thumbTintColor = UIColor.blue
// 设置滑块的起始值
self.view.backgroundColor = UIColor.white
redSlider.value = 1.0
greenSlider.value = 1.0
blueSlider.value = 1.0
// 给这三个滑块添加关联事件
redSlider.addTarget(self, action: #selector(changeColor), for: .valueChanged)
greenSlider.addTarget(self, action: #selector(changeColor), for: .valueChanged)
blueSlider.addTarget(self, action: #selector(changeColor), for: .valueChanged)
}
func changeColor(){
self.view.backgroundColor = UIColor(red:CGFloat(redSlider.value),green:CGFloat(greenSlider.value),blue:CGFloat(blueSlider.value),alpha:1.0)
}
}
