SDWebImage下載圖像完成模塊未調用

Question

所以SDWebImage下載圖像並存儲到密鑰緩存中，這正是我想要在應用程序中執行的操作。 我想將圖像存儲在密鑰中，然后再獲取圖像。 這是我的代碼塊：

SDWebImageManager.shared().imageDownloader?.downloadImage(with: URL.init(string: url), options: SDWebImageDownloaderOptions.highPriority, progress: { (receivedSize:Int,expectedSize:Int,url : URL?) in
  print("progressing here in this block ")
}, completed: ({(image : UIImage, data : Data,error : Error, finished : Bool)  in
  print("reached in the completion block ")

  if finished {
    SDImageCache.shared().store(image, forKey: "d", toDisk: true, completion: nil)
  } else {
    print(error.localizedDescription)
    showAlert(viewController: self, title: "", message: error.localizedDescription)
  }           
} as? SDWebImageDownloaderCompletedBlock))

但是，從未調用完成塊。

Answer 1

使用這段代碼：

SDWebImageManager.shared().loadImage(with: NSURL.init(string: individualCellData["cover_image"] as! String ) as URL?, options: .continueInBackground, progress: { (recieved, expected, nil) in
            print(recieved,expected)
        }, completed: { (downloadedImage, data, error, SDImageCacheType, true, imageUrlString) in
            DispatchQueue.main.async {
                if downloadedImage != nil{
                    self.yourImageView.image = downloadedImage
                }
            }
        })

而且您不必像SDWebImage已經做的那樣再次緩存圖像。 要從緩存中檢索圖像，只需在此代碼中使用相同的url，如果存在，它將從緩存中獲取圖像。

更新的代碼：

如果要使用自己的密鑰，請使用imageDownloader而不是loadImage：

SDWebImageManager.shared().imageDownloader?.downloadImage(with: NSURL.init(string: individualCellData["cover_image"] as! String ) as URL?, options: .continueInBackground, progress: { (recieved, expected, nil) in
                print(recieved,expected)
            }, completed: { (image, data, error, true) in
                print("Completed")
            })

在print("Completed")如果沒有錯誤，請使用您的緩存代碼通過您的自定義鍵來緩存圖像。