iOS-Collectionview图像在滚动时消失，有时会重叠 [英] iOS - Collectionview images disappear on scrolling and sometimes overlaps

问题描述

从服务器下载图像并填充收集视图时（网格3 * n）。我正在小故障。

When downloading images from server and populating the collection view (grid 3 * n). I am getting glitch .

我几乎尝试了所有可能的方法，例如在重新使用单元格之前使图像视图为零，并使用GCD从主线程更新图像视图。

I tried almost everything possible like making image view nil before reusing cell and using GCD for updating image view from main thread.

但是我仍然面对故障。

小故障是当我滚动收集视图时，下载的图像重叠，有时会从收集视图单元中消失。

Glitch is when I scroll the collection view , images downloaded are overlapped and sometimes disappear from the collection view cell.

我不知道是什么原因导致图像消失（曾经下载过）。

I have no idea what is causing the image to disappear (which were once downloaded).

任何建议

    private func cellForDropbox(cell:GridCell,indexPath:IndexPath) -> GridCell {

    let filename = self.filenames[(indexPath as NSIndexPath).row]

    cell.imageView.backgroundColor = UIColor.lightGray
    cell.imageView.image = nil

    DropboxClientsManager.authorizedClient?.files.getTemporaryLink(path: filename).response(completionHandler: { (response, error) in

            if let url = response {
                cell.imageView.sd_setImage(with: URL(string:url.link), placeholderImage: nil, options: .refreshCached, completed: { (img, error, cacheType, url) in
                })

            } else {
                print("Error downloading file from Dropbox: \(error!)")
            }
        })

    return cell
}

推荐答案

如果这样做，请尝试

private func cellForDropbox(cell:GridCell,indexPath:IndexPath) -> GridCell {

    let filename = self.filenames[(indexPath as NSIndexPath).row]

    cell.imageView.backgroundColor = UIColor.lightGray

    DropboxClientsManager.authorizedClient?.files.getTemporaryLink(path: filename).response(completionHandler: { (response, error) in

            if let url = response {
            cell.imageView.sd_setImage(with: URL(string: url.link), placeholderImage: UIImage(named: "placeholder.png"))


            } else {
                print("Error downloading file from Dropbox: \(error!)")
            }
        })

    return cell
}

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