Ios 具有背景图像的CollectionView

我使用带有透明背景的collectionView和collectionView下的imageView。我根据中间的单元格改变图像视图，但是图像没有正确显示，如何解决它，它应该是怎样的一个例子，看起来低于

Gif:

工作原理：

工作原理：

CollectionViewCell

class CustomPagerViewCell: UICollectionViewCell  {

@IBOutlet weak var ImageView: UIImageView!
@IBOutlet weak var Name: UILabel!
@IBOutlet weak var descriptions: UILabel!
@IBOutlet weak var Publish: UILabel!
@IBOutlet weak var Folowers: UILabel!
@IBOutlet weak var BG: UIView!

@IBOutlet weak var like: UIButton!
@objc var liking: ((UICollectionViewCell) -> Void)?
@IBAction func like(_ sender: Any) {
   liking?(self)
}

override func awakeFromNib() {
    super.awakeFromNib()
    // Initialization code
    like.tintColor = UIColor(hex: 0xD1D1D1, alpha: 1)


    ImageView.contentMode = .scaleAspectFit
    ImageView.layer.cornerRadius = 35
    ImageView.layer.borderWidth = 1
    ImageView.layer.borderColor = UIColor(hex: 0xD4D4D4, alpha: 1).cgColor
    ImageView.layer.masksToBounds = true


}

插入部分位于

 func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {

        let cellWidth : CGFloat = self.collectionViewMenu.frame.width/1.2
        let numberOfCells = floor(self.view.frame.size.width / cellWidth)
        let edgeInsets = (self.view.frame.size.width - (numberOfCells * cellWidth)) / (numberOfCells + 1)

        return UIEdgeInsetsMake(collectionViewRecomend.frame.height - 165, edgeInsets, 0, edgeInsets)


}

class CenterCellCollectionViewFlowLayout: UICollectionViewFlowLayout {

override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint {

    if let cv = self.collectionView {

        let cvBounds = cv.bounds
        let halfWidth = cvBounds.size.width * 0.5;
        let proposedContentOffsetCenterX = proposedContentOffset.x + halfWidth;

        if let attributesForVisibleCells = self.layoutAttributesForElements(in: cvBounds) {

            var candidateAttributes : UICollectionViewLayoutAttributes?
            for attributes in attributesForVisibleCells {

                // == Skip comparison with non-cell items (headers and footers) == //
                if attributes.representedElementCategory != UICollectionElementCategory.cell {
                    continue
                }

                if let candAttrs = candidateAttributes {

                    let a = attributes.center.x - proposedContentOffsetCenterX
                    let b = candAttrs.center.x - proposedContentOffsetCenterX

                    if fabsf(Float(a)) < fabsf(Float(b)) {
                        candidateAttributes = attributes;
                    }

                }
                else { // == First time in the loop == //

                    candidateAttributes = attributes;
                    continue;
                }


            }

            return CGPoint(x : candidateAttributes!.center.x - halfWidth, y : proposedContentOffset.y);

        }

    }

    // Fallback
    return super.targetContentOffset(forProposedContentOffset: proposedContentOffset)
 }
}

CollectionViewFlowLayout

 func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {

        let cellWidth : CGFloat = self.collectionViewMenu.frame.width/1.2
        let numberOfCells = floor(self.view.frame.size.width / cellWidth)
        let edgeInsets = (self.view.frame.size.width - (numberOfCells * cellWidth)) / (numberOfCells + 1)

        return UIEdgeInsetsMake(collectionViewRecomend.frame.height - 165, edgeInsets, 0, edgeInsets)


}

class CenterCellCollectionViewFlowLayout: UICollectionViewFlowLayout {

override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint {

    if let cv = self.collectionView {

        let cvBounds = cv.bounds
        let halfWidth = cvBounds.size.width * 0.5;
        let proposedContentOffsetCenterX = proposedContentOffset.x + halfWidth;

        if let attributesForVisibleCells = self.layoutAttributesForElements(in: cvBounds) {

            var candidateAttributes : UICollectionViewLayoutAttributes?
            for attributes in attributesForVisibleCells {

                // == Skip comparison with non-cell items (headers and footers) == //
                if attributes.representedElementCategory != UICollectionElementCategory.cell {
                    continue
                }

                if let candAttrs = candidateAttributes {

                    let a = attributes.center.x - proposedContentOffsetCenterX
                    let b = candAttrs.center.x - proposedContentOffsetCenterX

                    if fabsf(Float(a)) < fabsf(Float(b)) {
                        candidateAttributes = attributes;
                    }

                }
                else { // == First time in the loop == //

                    candidateAttributes = attributes;
                    continue;
                }


            }

            return CGPoint(x : candidateAttributes!.center.x - halfWidth, y : proposedContentOffset.y);

        }

    }

    // Fallback
    return super.targetContentOffset(forProposedContentOffset: proposedContentOffset)
 }
}

class CenterCellCollectionViewFlowLayout:UICollectionViewFlowLayout{
覆盖func targetContentOffset（forProposedContentOffset proposedContentOffset:CGPoint，使用CrollingVelocity:CGPoint）->CGPoint{
如果让cv=self.collectionView{
设cvBounds=cv.bounds
设半宽=cvBounds.size.width*0.5；
设proposedContentOffsetCenterX=proposedContentOffset.x+半宽；
如果let attributesForVisibleCells=self.layouttributesforElements（in:cvBounds）{
var CandidateAttribute:UICollectionViewLayoutAttribute？
对于attributesForVisibleCells中的属性{
//==跳过与非单元格项（页眉和页脚）的比较==//
如果attributes.representedElementCategory！=UICollectionElementCategory.cell{
持续
}
如果让candAttrs=candidateAttribute{
设a=attributes.center.x-proposedContentOffsetCenterX
设b=candAttrs.center.x-proposedContentOffsetCenterX
如果fabsf（浮动（a））