iOS UIImagePNGRepresentation crash due to "Memory Pressure" - ios

Question

I have UIImagePicker and UICollectionView in my view controller. I'am taking pictures and on 4th picture (it is also new line in collection view) application crashes due to "Memory Pressure". UIImagePicker delegate:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
// Do picture get here
NSError *error;
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
NSData *imageData = UIImagePNGRepresentation(image);
NSNumber *imageNumber = [NSNumber numberWithInteger:[databaseManagementService selectTaskPictures].count];
NSString *imageName = [[imageNameDefault stringByAppendingString:[NSString stringWithFormat:objectFormat, imageNumber]] stringByAppendingString:extensionPNG];
// Do picture save to documents directory here
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:imageName];
[imageData writeToFile:savedImagePath atomically:NO];
// Do UIImagePicker dismiss here
[picker dismissViewControllerAnimated:YES completion:nil];
// Do picture details save to database here
TaskManagerTaskPicture *taskPicture = [[TaskManagerTaskPicture alloc] init];
taskPicture.filename = imageName;
taskPicture.id = imageNumber;
taskPicture.title = imageName;
taskPicture.pictureID = self.taskObject.id;
taskPicture.taskID = self.taskObject.id;
taskPicture.locationID = self.taskObject.location.id;
[databaseManagementService insertTaskPictureObject:taskPicture andError:&error];
// Do task picture update here
// Do task object SELECT here
self.taskObject = [databaseManagementService selectTaskWithID:self.taskObject.id];
// Do task picture objects retreive from task object here
self.taskPictureObjects = [self.taskObject.taskPicture allObjects];
// Do collection data reload here
[self.taskPicturesCollectionView reloadData];
}
Until now I have been debuting and realized that trouble is dousing by line:
NSData *imageData = UIImagePNGRepresentation(image);
Does anyone have any idea how to fix this issue?

Answer 1

Can you explain better the flow of your app?
However try implementing this code:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
// Do picture get here
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
NSError *error;
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
NSData *imageData = UIImagePNGRepresentation(image);
NSNumber *imageNumber = [NSNumber numberWithInteger:[databaseManagementService selectTaskPictures].count];
NSString *imageName = [[imageNameDefault stringByAppendingString:[NSString stringWithFormat:objectFormat, imageNumber]] stringByAppendingString:extensionPNG];
// Do picture save to documents directory here
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:imageName];
[imageData writeToFile:savedImagePath atomically:YES];
dispatch_async(dispatch_get_main_queue(), ^{
// Do UIImagePicker dismiss here
[picker dismissViewControllerAnimated:YES completion:nil];
// Do picture details save to database here
TaskManagerTaskPicture *taskPicture = [[TaskManagerTaskPicture alloc] init];
taskPicture.filename = imageName;
taskPicture.id = imageNumber;
taskPicture.title = imageName;
taskPicture.pictureID = self.taskObject.id;
taskPicture.taskID = self.taskObject.id;
taskPicture.locationID = self.taskObject.location.id;
[databaseManagementService insertTaskPictureObject:taskPicture andError:&error];
// Do task picture update here
// Do task object SELECT here
self.taskObject = [databaseManagementService selectTaskWithID:self.taskObject.id];
// Do task picture objects retreive from task object here
self.taskPictureObjects = [self.taskObject.taskPicture allObjects];
// Do collection data reload here
[self.taskPicturesCollectionView reloadData];
});
});
}