我如何获取缓存图像的数据SDWebImage [英] how can I get the data of cached images SDWebImage

问题描述

我正在使用SDWebImage库在UICollectionView中缓存Web图像:

I'm using SDWebImage library to cache web images in my UICollectionView:

cell.packItemImage.sd_setImage(with: URL(string: smileImageUrl[indexPath.row]))

但是我想将缓存的图像保存在本地文件中，而不是再次下载

but I want to save the cached images locally in a file instead of downloading them again

FileManager.default.createFile(atPath: newPath, contents: Data(contentsOf:  URL(string: snapchildvalue[Constants.smiles.smileImageUrl] as! String)!), attributes: nil)

有没有一种方法来获取缓存图像的数据

is there a way to get the data of cached images

推荐答案

SDWebImage默认情况下自动缓存下载的图像.您可以使用SDImageCache从缓存中检索图像.当前应用程序会话有一个内存缓存，这会更快，并且有磁盘缓存.用法示例:

SDWebImage caches downloaded images automatically by default. You can use SDImageCache to retrieve images from the cache. There is a memory cache for the current app session, which will be quicker, and there is the disk cache. Example usage:

if let image = SDImageCache.shared().imageFromDiskCache(forKey: imageURL.absoluteString) {
//use image
}

if let image = SDImageCache.shared().imageFromMemoryCache(forKey: imageURL.absoluteString) {
//use image
}

还请确保您在文件中import SDWebImage. (如果您使用的是Swift/Carthage，它将为import WebImage

Also make sure you import SDWebImage in your file. (If you're using Swift/Carthage, it will be import WebImage

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