IOS UISwitch 开关视图

let rect = CGRect(x：130, y：100, width：0, height：0)
let uiSwitch = UISwitch(frame：rect)
uiSwitch.setOn(true, animated：true)
uiSwitch.thumbTintColor = UIColor.blue
uiSwitch.onTintColor = UIColor.green
uiSwitch.tintColor = UIColor.brown
uiSwitch.addTarget(self, action：#selector(ViewController.switchChanged(_：)), for：
UIControlEvents.valueChanged)
self.view.addSubview(uiSwitch)