UICollectionView标头根据内容和页边距动态调整大小

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
    // 根据内容和页边距动态计算标头大小
    let headerSize = CGSize(width: collectionView.bounds.width - sectionInset.left - sectionInset.right, height: desiredHeaderHeight)
    return headerSize
}

func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
    if kind == UICollectionView.elementKindSectionHeader {
        let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "HeaderView", for: indexPath) as! HeaderView
        // 配置标头视图的内容
        headerView.titleLabel.text = "Section \(indexPath.section)"
        return headerView
    }
    return UICollectionReusableView()
}