let slider = VerticalPicker(frame: CGRect(x: 100, y: 200, width: 65, height: 135))
slider.backgroundColor = UIColor.red
slider.valueChanged = { value, isFinal in
print(value)
}
view.addSubview(slider)
slider.backgroundImage = UIImage(named: "color-picker")
slider.gradientTopColor = UIColor.white
slider.gradientBottomColor = UIColor.black
pod 'VerticalPicker'