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Create a strong ref of weakOperation in the entry of The image download subOperation, use the strong ref instead weakOperation

This commit is contained in:
yirenjun 2015-10-26 14:45:36 +08:00
parent 6b5f3236a8
commit 2b57abd44a
1 changed files with 16 additions and 8 deletions
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24
SDWebImage/SDWebImageManager.m
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@ -180,14 +180,15 @@
downloaderOptions |= SDWebImageDownloaderIgnoreCachedResponse;
}
id <SDWebImageOperation> subOperation = [self.imageDownloader downloadImageWithURL:url options:downloaderOptions progress:progressBlock completed:^(UIImage *downloadedImage, NSData *data, NSError *error, BOOL finished) {
if (weakOperation.isCancelled) {
__strong __typeof(weakOperation) strongOperation = weakOperation;
if (!strongOperation || strongOperation.isCancelled) {
// Do nothing if the operation was cancelled
// See #699 for more details
// if we would call the completedBlock, there could be a race condition between this block and another completedBlock for the same object, so if this one is called second, we will overwrite the new data
}
else if (error) {
dispatch_main_sync_safe(^{
if (!weakOperation.isCancelled) {
if (strongOperation && !strongOperation.isCancelled) {
completedBlock(nil, error, SDImageCacheTypeNone, finished, url);
}
});
@ -226,7 +227,7 @@
}
dispatch_main_sync_safe(^{
if (!weakOperation.isCancelled) {
if (strongOperation && !strongOperation.isCancelled) {
completedBlock(transformedImage, nil, SDImageCacheTypeNone, finished, url);
}
});
@ -238,7 +239,7 @@
}
dispatch_main_sync_safe(^{
if (!weakOperation.isCancelled) {
if (strongOperation && !strongOperation.isCancelled) {
completedBlock(downloadedImage, nil, SDImageCacheTypeNone, finished, url);
}
});
@ -247,7 +248,9 @@
if (finished) {
@synchronized (self.runningOperations) {
[self.runningOperations removeObject:operation];
if (strongOperation) {
[self.runningOperations removeObject:strongOperation];
}
}
}
}];
@ -255,13 +258,17 @@
[subOperation cancel];
@synchronized (self.runningOperations) {
[self.runningOperations removeObject:weakOperation];
__strong __typeof(weakOperation) strongOperation = weakOperation;
if (strongOperation) {
[self.runningOperations removeObject:strongOperation];
}
}
};
}
else if (image) {
dispatch_main_sync_safe(^{
if (!weakOperation.isCancelled) {
__strong __typeof(weakOperation) strongOperation = weakOperation;
if (strongOperation && !strongOperation.isCancelled) {
completedBlock(image, nil, cacheType, YES, url);
}
});
@ -272,7 +279,8 @@
else {
// Image not in cache and download disallowed by delegate
dispatch_main_sync_safe(^{
if (!weakOperation.isCancelled) {
__strong __typeof(weakOperation) strongOperation = weakOperation;
if (strongOperation && !weakOperation.isCancelled) {
completedBlock(nil, nil, SDImageCacheTypeNone, YES, url);
}
});