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Merge pull request #2032 from dreampiggy/adopt_refresh_cache_behavior 

Adopt the previous version behavior about SDWebImageDownloaderIgnoreC…
This commit is contained in:
Bogdan Poplauschi 2017-10-06 20:43:34 +03:00 committed by GitHub
parent 52993c7150 7491510f7e
commit 50e26dc5f7
2 changed files with 21 additions and 4 deletions
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1
SDWebImage/SDWebImageDownloader.h
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@ -23,7 +23,6 @@ typedef NS_OPTIONS(NSUInteger, SDWebImageDownloaderOptions) {
/**
* Call completion block with nil image/imageData if the image was read from NSURLCache
* (to be combined with `SDWebImageDownloaderUseNSURLCache`).
* I think this option should be renamed to 'SDWebImageDownloaderUsingCachedResponseDontLoad'
*/
SDWebImageDownloaderIgnoreCachedResponse = 1 << 3,

24
SDWebImage/SDWebImageDownloaderOperation.m
View File

@ -30,6 +30,7 @@ typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
@property (assign, nonatomic, getter = isExecuting) BOOL executing;
@property (assign, nonatomic, getter = isFinished) BOOL finished;
@property (strong, nonatomic, nullable) NSMutableData *imageData;
@property (copy, nonatomic, nullable) NSData *cachedData;
// This is weak because it is injected by whoever manages this session. If this gets nil-ed out, we won't be able to run
// the task associated with this operation
@ -148,6 +149,14 @@ typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
}];
}
#endif
if (self.options & SDWebImageDownloaderIgnoreCachedResponse) {
// Grab the cached data for later check
NSCachedURLResponse *cachedResponse = [[NSURLCache sharedURLCache] cachedResponseForRequest:self.request];
if (cachedResponse) {
self.cachedData = cachedResponse.data;
}
}
NSURLSession *session = self.unownedSession;
if (!self.unownedSession) {
NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
@ -451,13 +460,22 @@ didReceiveResponse:(NSURLResponse *)response
if ([self callbacksForKey:kCompletedCallbackKey].count > 0) {
/**
* If you specified to use `NSURLCache`, then the response you get here is what you need.
* if you specified to only use cached data via `SDWebImageDownloaderIgnoreCachedResponse`,
* the response data will be nil.
* So we don't need to check the cache option here, since the system will obey the cache option
*/
NSData *imageData = [self.imageData copy];
if (imageData) {
UIImage *image = [UIImage sd_imageWithData:imageData];
/** if you specified to only use cached data via `SDWebImageDownloaderIgnoreCachedResponse`,
* then we should check if the cached data is equal to image data
*/
if (self.options & SDWebImageDownloaderIgnoreCachedResponse) {
if (self.cachedData) {
if ([self.cachedData isEqualToData:imageData]) {
// call completion block with nil
[self callCompletionBlocksWithImage:nil imageData:nil error:nil finished:YES];
return;
}
}
}
NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:self.request.URL];
image = [self scaledImageForKey:key image:image];