UICollectionView在水平滚动时不会显示所有内容

Question

在我的情况下，我只有一个小节，该小节有11个项目。问题是我无法将其滚动到最后一个项目。我只能从左到小滚动一个距离。正确的方向，它使我反弹。 这是我的代码：

class RecommendGameView: UIView {

   //...
    override func layoutSubviews() {
        super.layoutSubviews()
        let layout = gameCollectionView.collectionViewLayout as! UICollectionViewFlowLayout
        layout.itemSize = CGSize(width: 80, height: 90)
        gameCollectionView.alwaysBounceHorizontal = true
                gameCollectionView.register(UINib(nibName: "CollectionGameCell", bundle: nil), forCellWithReuseIdentifier: kGameCellID)
        gameCollectionView.contentInset = UIEdgeInsets(top: 0, left: kEdgeInsetMargin, bottom: 0, right: kEdgeInsetMargin)
    }
}
    extension RecommendGameView : UICollectionViewDataSource {

        func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
            return (groups?.count ?? 0)
        }

        func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
            let cell = gameCollectionView.dequeueReusableCell(withReuseIdentifier: kGameCellID, for: indexPath) as! CollectionGameCell
            cell.group = groups![indexPath.item]
            return cell
        }
    }