Memory problem with UIImagePickerViewController

Hi,

This might be an iOS problem, but it is part of my unity plugin. I made a plugin to take a picture using the iOS image picker.

Once the picture has been captured, this method is called:

 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
 {
     //Dismiss the picker
     [[[UIApplication sharedApplication] keyWindow].rootViewController dismissModalViewControllerAnimated:NO];
     [[UIApplication sharedApplication] keyWindow].rootViewController = _unityViewController;
     
     
     //Create the 'photos' directory if needed
     NSFileManager *fm = [NSFileManager defaultManager];
     NSURL *tmpDirURL = [[[fm URLsForDirectory:NSCachesDirectory inDomains:NSUserDomainMask] objectAtIndex:0]
                         URLByAppendingPathComponent:@"photos"];
     
     if (![fm fileExistsAtPath:tmpDirURL.path]) {
         NSError *error;
         [fm createDirectoryAtURL:tmpDirURL withIntermediateDirectories:NO attributes:nil error:&error];
         
         if (error) {
             UnitySendMessage("PhotoLoader", "LoadPhoto", [error.description UTF8String]);
             return;
         }
     }
     
     UIImage *im = [info valueForKey:UIImagePickerControllerOriginalImage];
     
     
     //Save the file
     NSURL *fileURL = [tmpDirURL URLByAppendingPathComponent:_filename];
     NSData *data = UIImageJPEGRepresentation(im, 0.8f);
     if([data writeToFile:fileURL.path atomically:YES])
     {
         UnitySendMessage("PhotoLoader", "LoadPhoto", [_filename UTF8String]);
     }
     else
     {
         UnitySendMessage("PhotoLoader", "LoadPhoto", "");
     }
 }

This works fine once, but the second time, my app crashes for running out of memory. I know the image picker is using a lot of memory, but when I cancel the picture (and therefore not run through the code above), the image picker is dismissed and all the memory is returned. So I think there is a leak somewhere in the method above... Can anyone help? thanks