// 实例化（注意：默认宽高是 51 x 31。指定大小无效）
let switchview = UISwitch(frame: CGRectMake(10.0,10.0,0.0,0.0))
self.view.addSubview(switchview)
switchview.backgroundColor = UIColor.yellowColor()
        
// 打开时背景色
switchview.onTintColor = UIColor.brownColor()
// 开关块颜色
switchview.thumbTintColor = UIColor.blueColor()
// 关闭时边框颜色
switchview.tintColor = UIColor.orangeColor()
        
// 开关图标设置（设置后无效？？）
switchview.onImage = UIImage(named: "normalImage")
switchview.offImage = UIImage(named: "hightImage")
        
// 初始化开，或关
switchview.setOn(false,animated: true)
        
// 响应事件
switchview.addTarget(self,action: Selector("switchValueChange:"),forControlEvents: UIControlEvents.ValueChanged)

// MARK: - switchValueChange
func switchValueChange(sender:UISwitch)
{
        let openStatus = sender.on
        if openStatus
        {
            self.view.backgroundColor = UIColor.cyanColor()
        }
        else
        {
            self.view.backgroundColor = UIColor.whiteColor()
        }
}