NSURL* url = [NSURL URLWithString:@"xxx"];

    ASIFormDataRequest* request = [ASIFormDataRequest requestWithURL:url];

    request.uploadProgressDelegate = viewPost.progressView;

    request.showAccurateProgress = YES;

    request.shouldContinueWhenAppEntersBackground = YES;

    if ([imageArray count] > 0)

 {

        [request setPostFormat:ASIMultipartFormDataPostFormat];

        for (NSData* data in imageArray) {

            NSInteger idx = [imageArray indexOfObject:data];

            [request addData:data withFileName:[NSString stringWithFormat:@"image%d.png",idx] andContentType:@"image/png" forKey:@"photos[]"];

        }

    }