SDWebImage crash CFRunLoopRun(); crash #1262

沸腾的泪水05314

于 2016-02-01 11:18:49 发布

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本文讨论了在使用SDWebImage时遇到的一个问题：当快速滚动UITableView时，可能出现滚动冻结的情况。作者尝试并成功通过在进度块方法中使用dispatch_async来解决这一问题。文中还提供了代码示例和相关解释。

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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 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(), ^{
@strongify(self);
[self.progressView setProgress:receivedSize / (float)expectedSize];
});

armnotstrong commented on 24 Aug 2015

@timkoma 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