App is terminated due to memory pressure while taking multiple pictures - ios

Question

I have tried a lot of solutions provided on other questions which were same as mine but nothing could help me much.
Let me tell you what am I doing. I have a collection view. In that I will display some images which will be captured by camera. I am capturing multiple pictures at a time. All the pictures which I have taken, the address of those images will first save into database and then those images will be displayed in collection view.
Now what happens, when I click 40-50 images at a time, the app is crashed and xcode displays a message something like "app is terminating due to memory pressure". Also I am getting too many memory warnings in logs but actually I was neglecting them.
First I am writing code for taking multiple pictures-
- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
//Get Image URL from Library
NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
NSURL *urlPath = [info valueForKey:UIImagePickerControllerReferenceURL];
if (segmentControl.selectedSegmentIndex != 1) {
[picker dismissViewControllerAnimated:YES completion:nil];
}
if (segmentControl.selectedSegmentIndex == 2) {
[self insertPicToDB:urlPath];
}else{
__block NSURL *url;
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
// Request to save the image to camera roll
[library writeImageToSavedPhotosAlbum:[image CGImage] orientation:(ALAssetOrientation)[image imageOrientation] completionBlock:^(NSURL *assetURL, NSError *error){
if (error) {
} else {
url = assetURL;
[self insertPicToDB:url];
}
}];
}
}
}
}
After while taking each picture, I am saving image url in db and then at the same time trying to reload the collection view as well.
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = #"Cell";
collectionCell = (CollectionCell *)[_collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
collectionCell.imageView = (UIImageView*)[collectionCell viewWithTag:100];
collectionCell.imageView.image = [UIImage imageNamed:#"placeholder.png"];
NSString *fileURL = [[recipeImages[indexPath.section] objectAtIndex:indexPath.item] objectForKey:#"FileUrl"];
collectionCell.imagURL = fileURL;
if ([fileURL hasPrefix:#"assets-library"]) {
[self getImageFromURL:[NSURL URLWithString:fileURL] :indexPath];
}else{
fileURL = [NSString stringWithFormat:#"%#/uploads/thumbnail/%#",[[HttpClient sharedInstance]getBaseURLString],[[fileURL componentsSeparatedByString:#"\\"]lastObject]];
[collectionCell.imageView setImageWithURL:[NSURL URLWithString:fileURL] placeholderImage:[UIImage imageNamed:#"placeholder.png"]];
}
return collectionCell;
}
So the condition is, I will keep clicking the pictures and the pictures will be saving in background.
And the definition of method "getImageFromURL" is-
-(void)getImageFromURL:(NSURL*)yourUrl :(NSIndexPath*)indexPath{
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)
{
ALAssetRepresentation *rep = [myasset defaultRepresentation];
#autoreleasepool {
CGImageRef iref = [rep fullScreenImage];
if (iref) {
UIImage *image = [UIImage imageWithCGImage:iref];
dispatch_async(dispatch_get_main_queue(), ^{
collectionCell = (CollectionCell*)[_collectionView cellForItemAtIndexPath:indexPath];
if (collectionCell) {
NSData *imageData = UIImageJPEGRepresentation(image, 0.1);
UIImage *compressedImage = [UIImage imageWithData:imageData];
collectionCell.imageView.image = compressedImage;
}else{
collectionCell.imageView.image = nil;
}
[collectionCell.imageView setNeedsDisplay];
[collectionCell setNeedsDisplay];
});
iref = nil;
}
}
};
ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror)
{
NSLog(#"Can't get image - %#",[myerror localizedDescription]);
};
ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc] init];
[assetslibrary assetForURL:yourUrl
resultBlock:resultblock
failureBlock:failureblock];
}
I am also trying to compress the images while fetching in collection view. So I don't think that it is crashing because of collection view. What can be the reason? Is it because of I am using ALAssetsLibrary or something else?
I was debugging it in iPhone 4S with iOS version 7.1.1.
Thanks in advance.