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转载自: https://github.com/rs/SDWebImage/issues/1262
Hi, we came to the same issue with the latest version(3.7.3), when scrolling the Cells of UITableView very fast. randomly the scrolling may be frozen.
We invoke SDWebImage like this:
- (void)configureImageWitURL:(NSURL *)imageURL{ @weakify(self); [self sd_setImageWithURL:imageURL placeholderImage:nil options:SDWebImageRetryFailed progress:^(NSInteger receivedSize, NSInteger expectedSize) { @strongify(self); [self.progressView setProgress:receivedSize / (float)expectedSize]; } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) { @strongify(self); self.progressView.hidden = YES; if (cacheType != SDImageCacheTypeMemory) { self.alpha = 0; [UIView animateWithDuration:0.3 animations:^{ self.alpha = 1; }]; } }];} I tried dispatch_async, and it seems problem solved, (Though I'm not very certain of that, because this happened randomly, but I haven't came to that problem since change the code withdispatch_async). Thanks
I think that there is a bug in SDWebImage: progress block gets called on background thread.
try to call the body of the progress block method using dispatch_async:
dispatch_async (dispatch_get_main_queue(), ^{
(self);
[self.progressView setProgress:receivedSize / (float)expectedSize];
});