let slider =UISlider(frame: CGRect(x: 30, y: 100, width: 300, height: 50))

        slider.center = self.view.center

        slider.minimumValue = 0

        slider.maximumValue = 1

//        slider.value = 0.5

        self.view.addSubview(slider)

        

        slider.setValue(0.8, animated: true)

       

        slider.isContinuous = false//滑块滑动停止后才触发ValueChange事件

        slider.addTarget(self, action: #selector(sliderDidchange(slider:)), for: .valueChanged)

        

        slider.minimumTrackTintColor = UIColor.red//左边槽的颜色

        slider.maximumTrackTintColor = UIColor.green //右边槽的颜色

        slider.minimumValueImage = UIImage(named: "baibai")//左边图片

        slider.maximumValueImage = UIImage(named: "baibai")//右边图片

        //自定义滑块组件图片

        //设置滑块右边部分的图片

        slider.setMaximumTrackImage(UIImage(named: "baibai"), for:.normal)

        //设置滑块左边部分的图片

        slider.setMinimumTrackImage(UIImage(named: "baibai"), for: .normal)

        //设置滑块的图片

        slider.setThumbImage(UIImage(named: "baibai"), for: .normal)

        

        //设置滑块右边部分的图片 -  使用三宫格缩放（左右像素不变，中间缩放）

        let imgTrackRight = UIImage(named: "baibai")

        let imgRight = imgTrackRight!.stretchableImage(withLeftCapWidth: 14, topCapHeight: 0)

        slider.setMaximumTrackImage(imgRight, for: .normal)