openFrameworks iOS image saving

ofxiOSImageSaver.h

//
//  ofxiOSImageSaver.h
//  Colorizer
//
//  Created by Brett Renfer on 9/9/14.
//

#pragma once

#include "ofMain.h"
#import "AssetsLibrary/AssetsLibrary.h"

class ofxiOSImageEntry
{
public:
    
    string      url;
    ofPixels    pixels;
};

class ofxiOSImageArgs {
public:
    
    string  url;
    int     id;
};

class ofxiOSImageSaver : protected ofThread
{
public:
    
    ~ofxiOSImageSaver(){
        waitForThread();
    }
    
    int saveImage( ofPixels & pix, string url = "" ){
        static int _id = 0;
        queue[_id].url = url;
        queue[_id].pixels.setFromExternalPixels(pix.getPixels(), pix.getWidth(), pix.getHeight(), pix.getNumChannels());
        queue[_id].pixels.setImageType(OF_IMAGE_COLOR_ALPHA); // iOS seems to only like RGBA?
        
        if (!isThreadRunning()){
            startThread();
        }
        _id++;
        
        return _id;
    };
    
    ofEvent<ofxiOSImageArgs> onImageSaved;
    
protected:
    
    void threadedFunction();
    
    map<int, ofxiOSImageEntry> queue;
};

ofxiOSImageSaver.mm

//
//  ofxiOSImageSaver.cpp
//  Colorizer
//
//  Created by Brett Renfer on 9/9/14.
//

#include "ofxiOSImageSaver.h"

void ofxiOSImageSaver::threadedFunction()
{
    if ( queue.size() > 0 ){
        auto it = queue.begin();
        int dispatchId = it->first;
        ofPixels pix = it->second.pixels;
        string url = it->second.url;
        queue.erase(it);
        
        int width = pix.getWidth();
        int height = pix.getHeight();
        int nChannels = pix.getNumChannels();
        
        NSInteger myDataLength = width * height * nChannels;
        
        CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, pix.getPixels(), myDataLength, NULL);
        CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
        CGImageRef imageRef = CGImageCreate(width, height, 8, 32, nChannels * width, colorSpaceRef, kCGBitmapByteOrderDefault, provider, NULL, NO, kCGRenderingIntentDefault);
        
        CGColorSpaceRelease(colorSpaceRef);
        CGDataProviderRelease(provider);
        
        UIImage * image = [UIImage imageWithCGImage:imageRef];
        CGImageRelease(imageRef);
        NSData * imageData = UIImageJPEGRepresentation(image, 1.0);
        
//        NSData * imageData = UIImagePNGRepresentation(image);
        UIImage * imageLossless = [UIImage imageWithData:imageData];
        
        static ofxiOSImageArgs args;
        args.id = dispatchId;
        
        // blank url = save to image library
        if ( url == "" ){
            
            ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
            // Request to save the image to camera roll
            [library writeImageToSavedPhotosAlbum:[imageLossless CGImage] orientation:(ALAssetOrientation)[imageLossless imageOrientation] completionBlock:^(NSURL *assetURL, NSError *error){
                if (error) {
                    NSLog(@"error");
                } else {
                    //                NSLog(@"url %@", assetURL);
                    args.url = [[assetURL absoluteString] UTF8String];
                    ofNotifyEvent(onImageSaved, args, this);
                }
            }];  
            [library release];
            
        } else {
            NSFileManager *defaultManager = [NSFileManager defaultManager];
            NSURL *docsURL = [[defaultManager URLsForDirectory:NSDocumentDirectory
                                                     inDomains:NSUserDomainMask] lastObject];
            NSURL *outputURL = [docsURL URLByAppendingPathComponent:[NSString stringWithUTF8String:url.c_str()]];
            [imageData writeToURL:outputURL atomically:YES];
            
            args.url = [[outputURL absoluteString] UTF8String];
            ofNotifyEvent(onImageSaved, args, this);
        }
        
        if ( queue.size() == 0){
            stopThread();
        }
    }
    
}

Hey there, does this still work? Images only seem to save if I leave the url blank, and even then they just show up black.