UICollectionView x3在标头集合视图中创建集合视图滑块

let layout = UICollectionViewFlowLayout()
let collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: 300, height: 200), collectionViewLayout: layout)

layout.sectionHeadersPinToVisibleBounds = true

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
    return CGSize(width: collectionView.bounds.width, height: 50)
}

collectionView.register(UICollectionReusableView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "HeaderView")

func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
    let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "HeaderView", for: indexPath)
    // 自定义标头视图的内容
    return headerView
}