ios - Collection View 单元格快速滚动到中心时出现问题

Question

我的 VC 中有一个 Collection View ，我水平滚动 Collection View ，我想将每个单元格水平滚动居中，我尝试了一个代码，但是当它滚动时，它显示下一个单元格比第二个单元格更左边。这是我的代码，

fileprivate let sectionInsets = UIEdgeInsets(top: 0, left: 15, bottom: 0, right: 15)

gridView.delegate = self
    gridView.dataSource = self
    gridView.register(ItemCollectionViewCell.self, forCellWithReuseIdentifier: "ItemCollectionViewCell")
    gridView.register(UINib(nibName: "ItemCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "ItemCollectionViewCell")
    gridView.showsHorizontalScrollIndicator = true
    gridView.bounces = true
    gridView.showsHorizontalScrollIndicator = false
    gridView.showsVerticalScrollIndicator = false

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
{
    return auctions?.properties?.count ?? 0
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
    let cell:ItemCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "ItemCollectionViewCell", for: indexPath) as! ItemCollectionViewCell;
    cell.propertyData = (auctions?.properties![indexPath.row])!
    if auctions?.status == AuctionStatus.Live.rawValue {
        cell.noOfBidsPlaced.isHidden = false
    }
    else {
        cell.noOfBidsPlaced.isHidden = true
    }
    cell.populateCell()

    return cell
}


func collectionView(_ collectionView: UICollectionView,
                    layout collectionViewLayout: UICollectionViewLayout,
                    sizeForItemAt indexPath: IndexPath) -> CGSize {
    let size = CGSize(width: 335 , height: 337)
    return size
}

//3
func collectionView(_ collectionView: UICollectionView,
                    layout collectionViewLayout: UICollectionViewLayout,
                    insetForSectionAt section: Int) -> UIEdgeInsets {
    return sectionInsets
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat
{
    return sectionInsets.left
}

func collectionView(_ collectionView: UICollectionView,
                    layout collectionViewLayout: UICollectionViewLayout,
                    minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return sectionInsets.left

}

如何才能将每个单元格完美地滚动到中心？这是它在开始时显示我的收藏的方式，

这就是滚动条上显示的内容，它从左侧被剪切

Answer 1

不要使用静态高度和宽度。调用这个函数。也许它对你有帮助:-

//func collectionView(_ collectionView: UICollectionView, 布局 collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {//返回 CGSize(宽度: yourCollectionView.frame.size.width, 高度: yourCollectionView.frame.size.height )//