iOS swift5 边框阴影 blur 外阴影

    lazy var topView:UIView = {
        let view = UIView()
        view.backgroundColor = .white
        // Shadow Code
        view.layer.shadowColor = UIColor(red: 2/255.0, green: 2/255.0, blue: 2/255.0, alpha: 0.06).cgColor
        view.layer.shadowOffset = CGSize(width: 0, height: 5)
        view.layer.shadowRadius = 12;
        view.layer.shadowOpacity = 1;
        // Radius Code
        view.layer.cornerRadius = 10;
        return view
    }()