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[英]Upload image in imageview inside collectionView using sdwebimage
[英]Crazy Memory Issues using SDWebImage in a CollectionView (inside a tableviewCell)
我一开始使用SDWebImage填充的图像视图滚动集合视图,就无法弄清楚为什么我的应用程序的内存会迅速上升。 如果尚未下载,则可以暂时使用。 但是一旦下载完每个图像,如果我什至不触摸滚动,应用程序ui都将变得无响应,并且内存飞速上升(超过1GB),不仅导致应用程序崩溃,而且整个操作系统崩溃并重新启动。
我有一个包含几个单元格的tableview,其中一个具有可滚动的collectionview。 我有一个数据对象,可用于填充collectionViewCell中的所有标签和图像。 cellForItem非常复杂(许多if语句和switch语句),因此我尝试将一些代码从那里移出,然后将其移到我在collectionViewCell中设置的用于容纳数据对象的属性的didSet方法中。 然后,我只是将数据对象设置为itemForRow中的属性(在后台线程中),该属性触发了单个collectionViewCell的didSet方法来填充标签并使用sd_set_image方法设置图像。 这是tableViewCell上的相关代码:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
print(indexPath.row)
if itemStyle == .Grid {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: self.resourceCellIdentifier, for: indexPath) as! ResourceCollectionViewCell
cell.delegate = self
cell.tag = indexPath.row
if self.filter == Filter.Collections || self.resourceArray?[indexPath.row].actionContent == nil {
let resource: ActionContentTemplate?
if self.filter == Filter.Collections {
resource = self.collectionResourceArray?[indexPath.row].actionContentTemplate
} else {
resource = self.resourceArray?[indexPath.row].actionContentTemplate
}
DispatchQueue.global(qos: .userInitiated).async {
cell.dataObject = resource
}
return cell
} else {.....
这是CollectionViewCell本身的didSet方法:
var dataObject: ActionContentTemplate? {
didSet {
var cellRow: Int = 0
if self.actionContentTemplate != nil {
....
DispatchQueue.main.async {
cellRow = self.tag
.....
switch self.actionContentTemplate?.contentTypeID?.uintValue {
case ContentTypeVideo.rawValue,
ContentTypeVideoRecording.rawValue,
ContentTypeScreenRecording.rawValue:
.......
case ContentTypeAttachment.rawValue:
let fileType = (self.actionContentTemplate?.contentFileName as NSString?)?.pathExtension.lowercased()
var placeholderImage: UIImage
if fileType == "pdf" {
placeholderImage = UIImage(named: "pdf")!
} else if fileType == "doc" {
placeholderImage = UIImage(named: "doc")!
} else if fileType == "docx" {
placeholderImage = UIImage(named: "doc")!
} else if fileType == "xls" {
placeholderImage = UIImage(named: "xls")!
} else if fileType == "xlsx" {
placeholderImage = UIImage(named: "xls")!
} else if fileType == "ppt" {
placeholderImage = UIImage(named: "ppt")!
} else if fileType == "pptx" {
placeholderImage = UIImage(named: "ppt")!
} else {
placeholderImage = UIImage(named: "plain")!
}
if let urlString = self.actionContentTemplate?.thumbnailURL {
let imageURL = URL(string: urlString)
SDWebImageManager.shared().loadImage(with: imageURL, options: [.continueInBackground, .scaleDownLargeImages], progress: nil) { (image, data, err, cacheType, finished, url) in
DispatchQueue.main.async {
if cellRow == self.tag {
self.activityIndicator?.stopAnimating()
self.imageView.image = image
UIAnimation.fadeTransitionImageView(self.imageView)
}
}
}
}
} else {
DispatchQueue.main.async {
self.activityIndicator?.stopAnimating()
self.imageView.image = placeholderImage
}
}
break
.....
实际上我切换到loadImage方法,因为sd_setimage方法也不起作用。
SDWebImageManager.shared().loadImage(with: imageURL, options: [.continueInBackground, .scaleDownLargeImages], progress: nil) { (image, data, err, cacheType, finished, url) in
DispatchQueue.main.async {
if cellRow == self.tag {
//IF I COMMENT OUT THESE TWO LINES BELOW THE ISSUES STOP (I think it is only the self.imageView.image = image line that is causing issues)
// self.activityIndicator?.stopAnimating()
// self.imageView.image = image
UIAnimation.fadeTransitionImageView(self.imageView)
}
}
}
谁能向我解释为什么会发生这种情况以及我可以采取什么措施来解决?
编辑-忘记在应用程序委托中将这些设置添加到问题:
//Settings for image caching
[[SDWebImageDownloader sharedDownloader] setShouldDecompressImages:NO];
[[[SDImageCache sharedImageCache] config] setShouldDecompressImages:NO];
[[[SDImageCache sharedImageCache] config] setShouldCacheImagesInMemory:NO];
[[[SDImageCache sharedImageCache] config] setMaxCacheSize:1024 * 1024 * 100];
[[[SDImageCache sharedImageCache] config] setMaxCacheAge:3600 * 24 * 7];
[[SDImageCache sharedImageCache] setMaxMemoryCost:1024 * 1024 * 15];
原来缩略图很大,并且使用此链接( iOS Swift:如何正确缩小图像? )将图像调整为imageView大小,从而完全解决了内存问题。 但是,下载完图像后,滚动会有点混乱。...我认为将尽可能多的计算代码移至后台线程,并移出cellForItem会对此有所帮助,但我显然遗漏了一些东西。 如果有人能指出正确的方向,那我将不胜感激,因为我一直在努力学习更多有关开发人员的知识。
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