swift UISlider实现

    lazy var layder:UISlider = {
    let layder = UISlider.init()
    layder.frame = CGRect(x: 20, y: self.textView.maxY, width: self.textView.width, height: 40)
    layder.thumbTintColor = UIColor.green
    layder.value = 0.5
    layder.minimumValue = 0.1
    layder.maximumValue = 1
    layder.minimumTrackTintColor = UIColor.orange
    layder.maximumTrackTintColor = UIColor.yellow
    return layder
}()