集合单元在每个 reloadData() 调用 Swift 5 时删除项目

Posted 2023-02-24

【中文标题】集合单元在每个 reloadData() 调用 Swift 5 时删除项目

【英文标题】：Collection cell removes item on each reloadData() call Swift 5

【发布时间】：2020-03-27 04:49:22

【问题描述】：

请看下图，这是我正确的初步看法。

但是在为 collectionView 调用 reloadData() 之后，它会删除“COMPLETED”状态标签，如果我再次重复该操作，它将删除“PROCESSING”状态标签。有谁知道它为什么会这样？

这是我的 cellForItemAt 代码。

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: DFCollectionViewCellIdentifierConstants.DF_CAPTURED_PANORAMAS_CELL, for: indexPath) as! DFCapturedPanoramasCollectionViewCell
        cell.capturedPanoramasImages.layer.masksToBounds = true
        cell.capturedPanoramasImages.layer.borderWidth = 1
        cell.capturedPanoramasImages.layer.borderColor = UIColor().hexColor(DFColorConstants.INPUT_TEXT_COLOR).cgColor
        cell.capturedPanoramasImages.layer.cornerRadius = 4

        let url = URL(string:panoramaList[indexPath.item].panoramaThumbnailPath)
        if url != nil && self.panoramaList[indexPath.item].panoramaStatus == DFPanoramaStatusConstants.DF_COMPLETED 
            self.panoramaStatusLabelFunc(cell: cell, index: indexPath.item, bgColor: UIColor().hexColor(DFColorConstants.PANORAMA_STATUS_COMPLETED_COLOR))
            cell.capturedPanoramasImages.contentMode = .scaleAspectFill
            if let data = try? Data(contentsOf: url!)
            
                let image = UIImage(data: data)
                cell.capturedPanoramasImages.image = image
            
            cell.capturedPanoramasLabel.text = panoramaList[indexPath.item].name
         else if url == nil && self.panoramaList[indexPath.item].panoramaStatus != DFStatusConstants.COMPLETED 
            self.panoramaStatusLabelFunc(cell: cell, index: indexPath.item, bgColor: UIColor().hexColor(DFColorConstants.PANORAMA_STATUS_UPLOADING_AND_PROCESSESING))
            cell.capturedPanoramasImages.contentMode = .scaleAspectFit
            cell.capturedPanoramasImages.image = self.capturedPanoramasImage[0]
            cell.capturedPanoramasLabel.text = panoramaList[indexPath.item].name
         else if self.panoramaList[indexPath.item].name == DFStatusConstants.ADD_PANORAMA 
            cell.panoramaStatusLabel.isHidden = true
            cell.capturedPanoramasImages.contentMode = .center
            cell.capturedPanoramasImages.image = self.capturedPanoramasImage[1]
            cell.capturedPanoramasLabel.text = panoramaList[indexPath.item].name
        
        return cell
    

还有panoramaStatusLabelFunc()函数。

func panoramaStatusLabelFunc(cell: DFCapturedPanoramasCollectionViewCell, index: Int, bgColor: UIColor)
        cell.capturedPanoramasLabel.isHidden = false
        cell.panoramaStatusLabel.layer.backgroundColor = bgColor.cgColor
        cell.panoramaStatusLabel.textColor = UIColor().hexColor(DFColorConstants.TEXT_WHITE_COLOR)
        cell.panoramaStatusLabel.layer.cornerRadius = 10
        cell.panoramaStatusLabel.text = self.panoramaList[index].panoramaStatus
    

【参考方案1】：

发现问题，它处于“cell.panoramaStatusLabel.isHidden = true”的以下条件。出于某种原因，它正在将 isHidden = true 传递给下一个单元格（我不确定，但可能是因为 Asyn）

else if self.panoramaList[indexPath.item].name == DFStatusConstants.ADD_PANORAMA 

    cell.panoramaStatusLabel.isHidden = true
    cell.capturedPanoramasImages.contentMode = .center
    cell.capturedPanoramasImages.image = self.capturedPanoramasImage[1]
    cell.capturedPanoramasLabel.text = panoramaList[indexPath.item].name

为了解决这个问题，我改变了全景状态标签函数如下：

    func panoramaStatusLabelFunc(cell: DFCapturedPanoramasCollectionViewCell, index: Int, bgColor: UIColor, isAddHotspot: Bool)
        cell.capturedPanoramasLabel.isHidden = false
        cell.panoramaStatusLabel.layer.backgroundColor = bgColor.cgColor
        cell.panoramaStatusLabel.textColor = UIColor().hexColor(DFColorConstants.TEXT_WHITE_COLOR)
        cell.panoramaStatusLabel.layer.cornerRadius = 10
        if(isAddHotspot) 
            cell.panoramaStatusLabel.text = ""
         else 
            cell.panoramaStatusLabel.text = self.panoramaList[index].panoramaStatus