修改UIProgressView 高度

class LXProgressView: UIProgressView {
    @IBInspectable var progressHeight: CGFloat = 4.0 {
        didSet {
            invalidateIntrinsicContentSize()
        }
    }
    
    override var intrinsicContentSize: CGSize {
        return CGSize(width: self.lx_size.width, height: progressHeight)
    }
}