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* This file is part of the SDWebImage package.
* (c) Olivier Poitrey <>
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
#import <Foundation/Foundation.h>
#import "SDWebImageManagerDelegate.h"
#import "SDWebImageManager.h"
* Prefetch some URLs in the cache for future use. Images are downloaded in low priority.
@interface SDWebImagePrefetcher : NSObject <SDWebImageManagerDelegate>
NSArray *_prefetchURLs;
NSUInteger _skippedCount;
NSUInteger _finishedCount;
NSUInteger _requestedCount;
NSTimeInterval _startedTime;
* Maximum number of URLs to prefetch at the same time. Defaults to 3.
@property (nonatomic, assign) NSUInteger maxConcurrentDownloads;
* SDWebImageOptions for prefetcher. Defaults to SDWebImageLowPriority.
@property (nonatomic, assign) SDWebImageOptions options;
* Return the global image prefetcher instance.
+ (SDWebImagePrefetcher *)sharedImagePrefetcher;
* Assign list of URLs to let SDWebImagePrefetcher to queue the prefetching,
* currently one image is downloaded at a time,
* and skips images for failed downloads and proceed to the next image in the list
* @param urls list of URLs to prefetch
- (void)prefetchURLs:(NSArray *)urls;
* Remove and cancel queued list
- (void)cancelPrefetching;
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