to use both effects

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self.contentView.layer.cornerRadius = 5
self.contentView.layer.masksToBounds = true
self.contentView.addShadow(.black, sRadius: 1, sOpacity: 0.3, offset: (1, 1))

and addShadow in layoutSubviews function

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func addShadow(_ sColor: UIColor, sRadius: CGFloat, sOpacity: Float, offset: (CGFloat, CGFloat), for changedRect: CGRect = .zero) {
      let rect = changedRect == .zero ? self.bounds : changedRect
      self.layer.shadowColor = sColor.cgColor
      self.layer.shadowRadius = sRadius
      self.layer.shadowOpacity = sOpacity
      // 设置 shadowOffset 会产生离屏渲染
      // self.layer.shadowOffset = CGSize(width: 5, height: 5)
      let path = UIBezierPath(roundedRect: rect.offsetBy(dx: offset.0, dy: offset.1), cornerRadius: self.layer.cornerRadius)
      self.layer.shadowPath = path.cgPath
      self.layer.masksToBounds = false
 }