UITableViewCell 嵌套CollectionView 自适应高度

嵌套时collection内容是动态的，高度不定，上下刷新后自适应高度如果是对的，可以在cell里面加这个试试,我这里加了这个是对的

override func systemLayoutSizeFitting(_ targetSize: CGSize, withHorizontalFittingPriority horizontalFittingPriority: UILayoutPriority, verticalFittingPriority: UILayoutPriority) -> CGSize {
        layoutIfNeeded()
        let size = contentView.systemLayoutSizeFitting(targetSize)
        return CGSize(width: size.width, height: size.height)
    }