情节提要中的CollectionView正在覆盖像元大小

Question

我有一个集合视图，其中的单元格会根据用户选择的大小而改变大小：小，中，大。我有协议UICollectionViewDelegateFlowLayout和委托函数：

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize

该函数可以正确设置单元格所需区域的大小，但不会调整单元格本身的大小。

这是将单元格设置为较小设置后的视图：

以下是具有默认大小的视图：

如您所见，单元格的空间已更改，但单元格大小未更改。

在情节提要中，无论单元格大小设置为多少，无论我在代码中做什么，大小都会是多少。有谁知道我该如何覆盖：

任何帮助将不胜感激。谢谢

编辑

正在调用委托函数。大小在其他页面上更改。该大小作为一个值存储在一个单例中，委托函数根据该值决定要使用的大小。这是委托函数：

func collectionView(_ collectionView: UICollectionView,
                    layout collectionViewLayout: UICollectionViewLayout,
                    sizeForItemAt indexPath: IndexPath) -> CGSize {
 //   if self.collectionView == collectionView {
        let viewHeight = collectionView.frame.height
        let smallSize = (viewHeight / 4) - 20
        let mediumSize = (viewHeight / 2) - 20
        let largeSize = viewHeight - 20
        switch gridSquareSize {
        case .small:
            return CGSize(width: smallSize, height: smallSize)
        case .standard:
            return CGSize(width: mediumSize, height: mediumSize)
        case .large:
            return CGSize(width: largeSize, height: largeSize)
        }
    //}
}

编辑2：

这是设置单元格的功能：

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

        cell.layoutIfNeeded()


        switch SettingsModel.instance.currentGridSquareSize {
        case .small:
            cell.galleryName.font = cell.galleryName.font.withSize(12)
            break
        case .standard:
            cell.galleryName.font = cell.galleryName.font.withSize(24)
            break
        case .large:
            cell.galleryName.font = cell.galleryName.font.withSize(36)
            break
        }
        cell.isHidden = false
        cell.background.backgroundColor = UIColor.white
        cell.plusIcon.isHidden = true
        cell.topLeftImage.isHidden = false
        cell.galleryName.textColor = UIColor(red: 45, green: 64, blue: 83, alpha: 1)
        cell.topLeftImage.image = UIImage(named: "PlaceholderImage")
        cell.delete.isHidden = !isInEditMode
        let position = indexPath.row
        if position == mGalleriesList.count {
            if isInEditMode {
                cell.background.backgroundColor = UIColor.darkGray
                cell.galleryName.text = "Add new gallery"
                cell.galleryName.textColor = UIColor.white
                cell.plusIcon.isHidden = false
                cell.topLeftImage.isHidden = true
                cell.delete.isHidden = true
            }
            else {
                cell.isHidden = true
            }
        }
        else {
            let gallery = mGalleriesList[position]
            cell.data = gallery
            cell.plusIcon.isHidden = true
            if let galleryName = gallery.galleryName {
                cell.galleryName.text = galleryName
            }
            var mediaEntries = [MediaEntry]()
            for entry in gallery.mediaEntries {
                if let deleted = entry.deleted {
                    if !deleted {
                        mediaEntries.append(entry)
                    }
                }
                else {
                    mediaEntries.append(entry)
                }
            }
            if mediaEntries.count > 0 {
                if let downloadUrl = mediaEntries[0].downloadUrl {
                    setImage(storageUrl: downloadUrl, imageView: cell.topLeftImage, placeholder: placeholder!, cropToBounds: false)
                }
            }
        }


        return cell
    }

这也是情节提要中单元格的屏幕截图：

希望这些附加信息有帮助