Ios 如何在集合视图中创建装饰视图

我想在我的UICollectionViewCompositionalLayout岁时创建装饰视图.我使用以下代码:

func createListTableSection(using section: Section) -> NSCollectionLayoutSection {
    
    let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1/3), heightDimension: .fractionalHeight(1))
    let layoutItem = NSCollectionLayoutItem(layoutSize: itemSize)
    layoutItem.contentInsets = NSDirectionalEdgeInsets(top: 8, leading: 8, bottom: 8, trailing: 8)
        
    let layoutGroupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(0.93), heightDimension: .fractionalWidth(0.5))
        
    let layoutGroup = NSCollectionLayoutGroup.horizontal(layoutSize: layoutGroupSize, subitems: [layoutItem])

    let layoutSection = NSCollectionLayoutSection(group: layoutGroup)
        
    layoutSection.orthogonalScrollingBehavior = .groupPagingCentered
        
    layoutSection.decorationItems = [NSCollectionLayoutDecorationItem.background(elementKind: RoundedBackgroundView.reuseIdentifier)]
    let layout = UICollectionViewCompositionalLayout(section: layoutSection)
    layout.register(RoundedBackgroundView.self, forDecorationViewOfKind: RoundedBackgroundView.reuseIdentifier)

    return layoutSection
}

圆形背景视图

class RoundedBackgroundView: UICollectionReusableView {
    static let reuseIdentifier = "RoundedBackgroundView"

    private var insetView: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = .secondarySystemFill
        view.layer.cornerRadius = 15
        view.clipsToBounds = true
        return view
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = .clear
        addSubview(insetView)

        NSLayoutConstraint.activate([
            insetView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 15),
            trailingAnchor.constraint(equalTo: insetView.trailingAnchor, constant: 15),
            insetView.topAnchor.constraint(equalTo: topAnchor),
            insetView.bottomAnchor.constraint(equalTo: bottomAnchor)
        ])
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

我得到了这个错误:

线程1:"无法将种类的装饰视图出列: 必须注册为类或nib或连接 故事板中的原型"

如何修复它？