App crash while downloading large images using SDWebImage?

Question

I'm using SDWebImage to download image async from server.Some images on server are of size ~1.5 to 2. MB.I'm showing these images on UICollectionView. I'm getting memory warning and app crashes after several run.Some times it happens when images downloaded first time and some time when i scroll the collection view up and down. Here is my code-

-(void)setImageWithUrl:(NSURL*)imgurl onImageView:(UIImageView*)image prograssive:(BOOL)progressive
{
    __block UIActivityIndicatorView *activityIndicator;
    __weak UIImageView *weakImageView = image;
    SDWebImageOptions opt;
    if (progressive) {

        opt = SDWebImageProgressiveDownload;
    }
    else
        opt = SDWebImageRetryFailed;
    [image sd_setImageWithURL:imgurl placeholderImage:[UIImage imageNamed:@"default_image"] options:opt progress:^(NSInteger receivedSize, NSInteger expectedSize)
     {
         if (!activityIndicator)
         {
             [weakImageView addSubview:activityIndicator = [UIActivityIndicatorView.alloc initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]];
             activityIndicator.center = CGPointMake(weakImageView.frame.size.width /2, weakImageView.frame.size.height/2);
             // activityIndicator.center = weakImageView.center;
             [activityIndicator setBackgroundColor:[UIColor clearColor]];
             [activityIndicator startAnimating];
         }
     }
                    completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL)
     {
         [activityIndicator removeFromSuperview];
         activityIndicator = nil;
     }];
}

and in AppDelegate-

- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
{

    [[SDImageCache sharedImageCache] clearMemory];
    [[SDImageCache sharedImageCache] cleanDisk];
    [[SDImageCache sharedImageCache] clearDisk];
    [[SDImageCache sharedImageCache] setValue:nil forKey:@"memCache"];
}

Please not the images are high resolution(more than 3000 pixel width).For example one of them has 4256*2832 and size 979KB produce the memory warning.Any help or suggestion would be appreciated. EDIT:- my App is being killed due to memory pressure, but only on iPhone 4s and lower versions(working fine on iPhone5 and above).when a large image is being downloaded(or complete download) i got a sudden memory spike(it goes from ~25mb to ~90mb) and app crashes.Any suggestion what to do?

Answer 1

It sounds like your App is being killed due to memory pressure. Check Instruments where exactly the memory increases and maybe try using an Autorelease Pool to mitigate any memory spikes.

Answer 2

Yes, @dlinsin is absolutely right. This is definitely memory issue.

I hope you are not using that same 2mb image as a thumbnail. if yes then thats why you are crashing. Please use lower resolution images as thumbs and show the larger ones when the user asks for it

By the way, use this to see if that could any help.

[[SDImageCache sharedImageCache] setShouldDecompressImages:NO]; [[SDWebImageDownloader sharedDownloader] setShouldDecompressImages:NO];