ImageDownload.m

//
//  ImageDownload.m
//

#import "ImageDownload.h"

@implementation ImageDownload {
    NSMutableArray *downloableImages;
    int position;

    mySync *mySync;
}

- (void)start:(NSArray *)images sync:(mySync *)sync
{
    NSArray *imageData;
    int imageDataCount;

    mySync = sync;
    downloableImages = [[NSMutableArray alloc] init];

    for (NSArray *image in images) {
        imageData = [image valueForKey:@"image"];
        imageDataCount = [imageData count];

        if (imageDataCount > 0) {
            [downloableImages addObject:imageData];
        }
    }

    [self downloadAllFiles];
}

- (void)downloadAllFiles
{
    NSString *filename;
    NSString *fileUrl;

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *cacheDirectory = [paths objectAtIndex:0];

    position = 0;
    int count = [downloableImages count];

    NSLog(@"Files to download %d", count);

    for (NSArray *image in downloableImages) {
        filename = [image objectAtIndex:0];
        fileUrl = [image objectAtIndex:1];

        NSURL *url = [NSURL URLWithString:fileUrl];
        NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc] initWithURL:url];

        NSOperationQueue *queue = [[NSOperationQueue alloc] init];
        [NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
            position++;

            float progress = ((float)position/(float)count);
            NSLog(@"%f", progress);
            NSLog(@"%@", fileUrl);


            if ([data length] > 0 && [[NSString stringWithFormat:@"%@", error] isEqualToString:@"(null)"]) {
                UIImage *downloadedImage = [[UIImage alloc] initWithData:[NSData dataWithData:data]];
                NSString *imageDestinationPath = [NSString stringWithFormat:@"%@%@", cacheDirectory, filename];

                NSData *imageData = [NSData dataWithData:UIImageJPEGRepresentation(downloadedImage, 100.0)];
                [imageData writeToFile:imageDestinationPath atomically:YES];
            } else if ([data length] == 0 && [[NSString stringWithFormat:@"%@", error] isEqualToString:@"(null)"]) {
                NSLog(@"No data");
            } else if (![[NSString stringWithFormat:@"%@", error] isEqualToString:@"(null)"]) {
                NSLog(@"Error = %@", error);
            }

            NSLog(@" ");

            if (position == count) {
                NSLog(@"one download complete...");

                [mySync setProgressImageDownload:1.0];
                [mySync downloadImagesComplete];
            } else {
                [mySync setProgressImageDownload:progress];
            }
        }];
    }
}

@end