AlamofireImage保存到caching的图像并不真正保存
我使用（尝试）AlamofireImage。 我保存到caching的图像并不真正保存。
我的代码包括：
import Alamofire import AlamofireImage let imageCache = AutoPurgingImageCache( memoryCapacity: 100 * 1024 * 1024, preferredMemoryUsageAfterPurge: 60 * 1024 * 1024 ) 那么我自己保存一个图像使用：
imageCache.add(image, withIdentifier: path)
但在下一次运行中，当我尝试使用相同的path获取此图像时，总是返回nil：
if let image = imageCache.image(withIdentifier: path){ return image } return nil
我究竟做错了什么？
- 而运行\debugging我可以看到imageCache-currentMemoryUsage = 0
谢谢。
你不需要调用add（）方法。 我创build了包装Alamofire图像caching的自定义类。
class ImageManager: NSObject { static let shared = ImageManager() private var imageDownloader: ImageDownloader! private var imageCache: AutoPurgingImageCache! // Configuration var maximumActiveDownloads = 5 var placeholderImage: UIImage! var imageTransitionDuration: NSTimeInterval = 0.5 // The total memory capacity of the cache in MB. var memoryCapacity: UInt64 = 150 //The preferred memory usage after purge in MB. During a purge, images will be purged until the memory capacity drops below this limit. var memoryUsageAfterPurge: UInt64 = 60 private override init() { super.init() imageCache = AutoPurgingImageCache( memoryCapacity: memoryCapacity * 1024 * 1024, preferredMemoryUsageAfterPurge: memoryUsageAfterPurge * 1024 * 1024 ) imageDownloader = ImageDownloader( configuration: ImageDownloader.defaultURLSessionConfiguration(), downloadPrioritization: .FIFO, maximumActiveDownloads: maximumActiveDownloads, imageCache: imageCache ) UIImageView.af_sharedImageDownloader = imageDownloader } func setImageOrPlaceholder(onImageView imageView: UIImageView, stringURL: String?) { guard let correctURL = NSURL.getURL(fromString: stringURL) else { //debug("URL incorrect!: \(stringURL)", isError: true) imageView.image = placeholderImage return } let imageTransition: UIImageView.ImageTransition = .CrossDissolve(imageTransitionDuration) imageView.af_setImageWithURL(correctURL, placeholderImage: placeholderImage, filter: nil, imageTransition: imageTransition, completion: { response in // debug("\(response.result.value)") }) } }
但在下一次运行中，当我尝试使用相同的path获取此图像时，总是返回nil：
这听起来像你正在重新启动你的应用程序。 ImageCache只是内存，当您重新启动应用程序时，应用程序的内存将被回收。