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extension UIView {
    func addShadow(opacity: Float = 0.4, color: UIColor = UIColor.gray, radius: CGFloat = 4, offset: CGSize = CGSize(width: 2, height: 2)){
        layer.shadowOffset = offset
        layer.shadowOpacity = opacity
        layer.shadowColor = color.cgColor
        layer.shadowRadius = radius
        layer.masksToBounds = false
    }
}