Conforms to NSObject
Declared in SDWebImageManager.h

Overview

Even if the image is cached, respect the HTTP response cache control, and refresh the image from remote location if needed. The disk caching will be handled by NSURLCache instead of SDWebImage leading to slight performance degradation. This option helps deal with images changing behind the same request URL, e.g. Facebook graph api profile pics. If a cached image is refreshed, the completion block is called once with the cached image and again with the final image.

Use this flag only if you can’t make your URLs static with embeded cache busting parameter.

Tasks

Instance Methods

imageManager:shouldDownloadImageForURL:

Controls which image should be downloaded when the image is not found in the cache.

- (BOOL)imageManager:(SDWebImageManager *)imageManager shouldDownloadImageForURL:(NSURL *)imageURL

Parameters

imageManager

The current SDWebImageManager

imageURL

The url of the image to be downloaded

Return Value

Return NO to prevent the downloading of the image on cache misses. If not implemented, YES is implied.

Discussion

Controls which image should be downloaded when the image is not found in the cache.

Declared In

SDWebImageManager.h

imageManager:transformDownloadedImage:withURL:

Allows to transform the image immediately after it has been downloaded and just before to cache it on disk and memory. NOTE: This method is called from a global queue in order to not to block the main thread.

- (UIImage *)imageManager:(SDWebImageManager *)imageManager transformDownloadedImage:(UIImage *)image withURL:(NSURL *)imageURL

Parameters

imageManager

The current SDWebImageManager

image

The image to transform

imageURL

The url of the image to transform

Return Value

The transformed image object.

Discussion

Allows to transform the image immediately after it has been downloaded and just before to cache it on disk and memory. NOTE: This method is called from a global queue in order to not to block the main thread.

Declared In

SDWebImageManager.h