Swift - 滑块（UISlider）的用法

let slider = UISlider(frame:CGRect(x:0, y:0, width:300, height:50))
slider.center = self.view.center
slider.minimumValue = 0  //最小值
slider.maximumValue = 1  //最大值
slider.value = 0.5  //当前默认值
self.view.addSubview(slider)

slider.setValue(0.8,animated:true)

slider.isContinuous = false  //滑块滑动停止后才触发ValueChanged事件
slider.addTarget(self,action:#selector(sliderDidchange(_:)), for:UIControlEvents.valueChanged)

@objc func sliderDidchange(_ slider:UISlider){
    print(slider.value)
}

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

slider.minimumValueImage = UIImage(named:"voice+")  //左边图标
slider.maximumValueImage = UIImage(named:"voice-")  //右边图标

//设置滑块右边部分的图片
slider.setMaximumTrackImage(UIImage(named:"slider_max"),for: .normal)
//设置滑块左边部分的图片
slider.setMinimumTrackImage(UIImage(named:"slider_min"),for: .normal)
//设置滑块的图片
slider.setThumbImage(UIImage(named:"slider_thumb"),for: .normal)

//设置滑块右边部分的图片-使用三宫格缩放（左右14像素不变，中间缩放）
let imgTrackRight = UIImage(named:"slider_max")
let imgRight = imgTrackRight!.stretchableImage(withLeftCapWidth: 14, topCapHeight:0)
slider.setMaximumTrackImage(imgRight, for: .normal)