swift:设置背景阴影

   lazy var doctorView: UIView = {
        let view = UIView()
        view.layer.backgroundColor = UIColor.white.cgColor
        view.layer.shadowColor = UIColor.init(44, 163, 152, 0.08).cgColor
        view.layer.cornerRadius = 20*sWidth
         view.layer.shadowOffset = CGSize(width: 0, height: 2)
         view.layer.shadowOpacity = 1
        view.layer.shadowRadius = 6
        return view
    }()