相册选原图倒置解决方案

- (void)addMediaToUploadQueue:(ALAsset *)media {
    @autoreleasepool {
        ALAssetRepresentation *defaultRepresentation = [media defaultRepresentation];
        CGImageRef fullResolutionImage = [defaultRepresentation fullResolutionImage];

        // Return if the user is trying to upload an image which has already been uploaded
        CGFloat scale = [defaultRepresentation scale];
        UIImageOrientation orientation = [defaultRepresentation orientation];

        UIImage *i = [UIImage imageWithCGImage:fullResolutionImage scale:scale orientation:orientation];
        if (![self isImageUnique:i]) return;

        NSDictionary *imageDictionary = [self dictionaryForAsset:media withImage:i];

        dispatch_async(self.background_queue, ^{
            NSManagedObjectContext *ctx = [APPDELEGATE createManagedObjectContextForThread];
            [ctx setUndoManager:nil];

            [ctx performBlock:^{
                ImageEntity *newImage = [NSEntityDescription insertNewObjectForEntityForName:@"ImageEntity"
                                                                    inManagedObjectContext:ctx];

                [newImage updateWithDictionary:imageDictionary
                         inManagedObjectContext:ctx];

                [ctx save:nil];

                [APPDELEGATE saveContext];

                dispatch_async(dispatch_get_main_queue(), ^{
                    [self.fetchedResultsController performFetch:nil];
                });

                    if (!currentlyUploading) {
                        currentlyUploading = YES;
                        [self uploadImage:newImage];
                    }
            }];
        });
    }
}