问IBOutlet pageControl无效

EN

class DetailViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UITableViewDelegate, UITableViewDataSource {

    // MARK: - IBOutlet's
    @IBOutlet weak var collectionView: UICollectionView!
    @IBOutlet weak var tableView: UITableView!

    @IBOutlet weak var pageControl: UIPageControl!

    var hallImages: Hall?

    var currentPage = 0

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    override func viewWillAppear(_ animated: Bool) {
        tableView.estimatedRowHeight = 626
        tableView.rowHeight = UITableViewAutomaticDimension

    }
    // MARK: - CollectionView
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        guard let imagesHall = hallImages?.ImagesHalls.count else {
            return 0
        }
        return imagesHall
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! DetailCollectionViewCell

        if let imagesHalls = hallImages?.ImagesHalls[indexPath.item] {
            cell.imageView.sd_setImage(with: URL(string: imagesHalls))
        }

        return cell
    }
}