AlamofireImage保存到緩存圖像並非真正保存

我正在使用（嘗試）AlamofireImage。我的保存到緩存圖像並未真正保存。AlamofireImage保存到緩存圖像並非真正保存

我的代碼包括：

import Alamofire 
import AlamofireImage 

let imageCache = AutoPurgingImageCache(
    memoryCapacity: 100 * 1024 * 1024, 
    preferredMemoryUsageAfterPurge: 60 * 1024 * 1024 
)

然後我使用保存圖像自己：

imageCache.add(image, withIdentifier: path)

但在接下來的運行，它總是返回零當我嘗試使用，以獲取該圖像相同的路徑：

if let image = imageCache.image(withIdentifier: path){ 
    return image 
} 
return nil

我做錯了什麼？

而運行\調試我可以看到imageCache-currentMemoryUsage = 0

感謝。

來源

2016-10-03 Eyal Ben Yehuda

你不需要調用add（）方法。我創建了包裝Alamofire圖像緩存的自定義類。

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)") 
     }) 
    } }

來源

2016-11-08 13:04:27

但在接下來的運行，它總是返回零，當我嘗試使用相同的路徑來獲取這一形象：

這聽起來像你重新啓動應用程序。 ImageCache只是內存，當您重新啓動應用程序時，應用程序的內存將被回收。

來源

2017-02-22 20:58:27 wyu

AlamofireImage保存到緩存圖像並非真正保存

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