(Swift) 设置阴影效果

⚠️⚠️⚠️ 设置阴影的视图，需要设置背景颜色

• Example

extension UIView {
    
    //   - Parameters
    //   - shadowColor: 阴影颜色
    //   - shadowOffset: 阴影偏移量
    //   - shadowRadius: 阴影半径
    //   - shadowOpacity: 阴影透明度
    func addShadow(shadowColor: CGColor, shadowOffset: CGSize, shadowRadius: CGFloat, shadowOpacity: Float ) {
        self.layer.shadowColor = shadowColor
        self.layer.shadowOffset = shadowOffset
        self.layer.shadowRadius = shadowRadius
        self.layer.shadowOpacity = shadowOpacity
    }
}