我希望我不会太晚）
为此，您需要为action元素设置自定义视图。
一种不太复杂的方法是在单元格的主视图下方添加另一个红色视图，并通过自定义滑动简单地设置新的平移。对于此视图，可以使用

tableView.subviews.forEach { view in 
   view.layer.shadow ....
}

另一种方法是为action元素创建掩码。

func configureMaskFor(size: CGSize) -> CAShapeLayer{
    let cornerRadius: CGFloat = 9

    let bezierPath = UIBezierPath()
    let startPoint = CGPoint(x: 0, y: 0)
    bezierPath.move(to: startPoint)

    let point1 = CGPoint(x: size.width - cornerRadius, y: 0)
    bezierPath.addLine(to: point1)
    bezierPath.addArc(withCenter: CGPoint(x: point1.x, y: cornerRadius), radius: cornerRadius, startAngle: CGFloat(Double.pi / 2 * 3), endAngle: 0, clockwise: true)

    let point2 = CGPoint(x: size.width, y: size.height - cornerRadius)
    bezierPath.addLine(to: point2)
    bezierPath.addArc(withCenter: CGPoint(x: point1.x, y: point2.y), radius: cornerRadius, startAngle: 0, endAngle: CGFloat.pi / 2, clockwise: true)

    let point3 = CGPoint(x: 0, y: size.height)
    bezierPath.addLine(to: point3)
    bezierPath.addArc(withCenter: CGPoint(x: point3.x, y: point3.y - cornerRadius), radius: cornerRadius, startAngle: CGFloat.pi / 2 , endAngle: 0, clockwise: false)

    let point4 = CGPoint(x: cornerRadius, y: cornerRadius)
    bezierPath.addLine(to: point4)
    bezierPath.addArc(withCenter: CGPoint(x: 0, y: cornerRadius), radius: cornerRadius, startAngle: 0, endAngle: CGFloat.pi / 2 * 3 , clockwise: false)

    bezierPath.close()

    let shapeLayer = CAShapeLayer()
    shapeLayer.path = bezierPath.cgPath
    return shapeLayer
}

然后在layoutSubviews（）中添加遮罩。

view.layer.mask = configureMaskFor(size: CGSize(width: contentView.frame.width * 0.2 , height: contentView.frame.height))