Swift - UISwitch

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        //创建UISWitch(Switch无需设置大小)
        let uiSwitch = UISwitch(frame: CGRect(x: 150, y: 250, width: 0, height: 0))
        //设置默认值
        uiSwitch.tintColor = UIColor.red//Switch 边框颜色
        uiSwitch.thumbTintColor = UIColor.blue//Switch 左右滑动的圆圈颜色
        uiSwitch.onTintColor = UIColor.black//Switch 空白部分颜色
        uiSwitch.setOn(true, animated: true)
        //创建点击UISwitchd事件
        uiSwitch.addTarget(self, action: #selector(ViewController.SwitchChanged), for: .valueChanged)
        self.view.addSubview(uiSwitch)
    }
    @objc func SwitchChanged(_ uiSwitch:UISwitch)
    {
        if uiSwitch.isOn{
            print("turn on the Switch")
        }else{
            print("turn off the Switch")
        }
    }
}