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UITableView で pull to refresh を実装した後、アプリのクラッシュを 4 ~ 5 回試みました ...

setImage の EXC_BAD_ACCESS。

cell.thumbnail.image = [UIImage imageNamed:@"noimage.png"];

dispatch_async(concurrentQueue, ^{

    NSString *imageURL = [currentArticle objectForKey:@"Image"];
    NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:imageURL]];
    UIImage *image = [[UIImage alloc] initWithData:imageData];


    dispatch_async(dispatch_get_main_queue(), ^{

    [cell.thumbnail setImage:image];

    });
});
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