Swift CollectionViewCell自动高度

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let cellWidth = collectionView.bounds.width // 获取CollectionView的宽度
    let contentHeight = calculateContentHeight() // 根据内容计算高度的方法
    return CGSize(width: cellWidth, height: contentHeight)
}

func calculateContentHeight() -> CGFloat {
    let contentWidth = collectionView.bounds.width - leftRightPadding // 根据实际情况减去左右边距
    let contentSize = CGSize(width: contentWidth, height: .greatestFiniteMagnitude)
    let contentRect = attributedText.boundingRect(with: contentSize, options: [.usesLineFragmentOrigin, .usesFontLeading], context: nil)
    return ceil(contentRect.height) + topBottomPadding // 根据实际情况加上顶部和底部边距
}