AFNetworking将图像从iOS上传到API

我无法上传包含数据的图片。 这段代码允许我上传数据就好了：

    NSURL *url = [NSURL URLWithString:@"my_base_url"];
AFHTTPClient *client = [[AFHTTPClient alloc]initWithBaseURL:url];

//depending on what kind of response you expect.. change it if you expect XML
[client registerHTTPOperationClass:[AFJSONRequestOperation class]];

NSDictionary *params = [[NSDictionary alloc]initWithObjectsAndKeys:
                        _topicText.text,@"Topic",
                        @"1",@"Category",
                        @"",@"MainMedia",
                        @"1",@"Creator",
                        nil];
[client postPath:@"apidebate/debates" parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {
    //

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"failure");
}];

不过，我试图上传带有这些数据的图片却不成功：

    NSURL *url = [NSURL URLWithString:@"my_base_url"];
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];
NSData *imageData = UIImageJPEGRepresentation([UIImage imageNamed:@"MainMedia"], 0.5);
NSMutableURLRequest *request = [httpClient multipartFormRequestWithMethod:@"POST" path:@"/upload" parameters:nil constructingBodyWithBlock: ^(id <AFMultipartFormData>formData) {
    [formData appendPartWithFileData:imageData name:@"MainMedia" fileName:@"MainMedia" mimeType:@"image/jpeg"];
}];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[operation setUploadProgressBlock:^(NSInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
    NSLog(@"Sent %lld of %lld bytes", totalBytesWritten, totalBytesExpectedToWrite);
}];
[operation start];

我在做什么工作可能会做错？

编辑 （添加服务器代码）

后端是Codeigniter与REST客户端Phil Sturgeon构建的（伟大的库，btw）。 我几乎肯定它不是服务器代码，因为这种方法的第一行给我发了一封电子邮件。 当我尝试使用上面的代码发布图片时，电子邮件永远不会来。 所以，它似乎甚至没有进入端点。

//CONTROLLER FROM API
function debates_post()
{
    mail('myemailaddress@gmail.com', 'Test', 'Posted');
    $tmp_dir = "images/posted/";

    if(isset($_FILES['MainMedia'])){
        $SaniFileName = preg_replace('/[^a-zA-Z0-9-_.]/','', basename($_FILES['MainMedia']['name']));

        $file = $tmp_dir . $SaniFileName;
        move_uploaded_file($_FILES['MainMedia']['tmp_name'], $file);
    }
    else
        $SaniFileName = NULL;

    $data = array('Topic'=>$this->post('Topic'), 'MainMedia'=>$this->post('MainMedia'), 'Category'=>$this->post('Category'), 'Creator'=>$this->post('Creator'));
    $insert = $this->debate->post_debate($this->post('Topic'), $SaniFileName, $this->post('Category'), $this->post('Creator'));
    if($insert){
        $message = $this->db->insert_id();
    }
    else{
        $message = 'Insert failed';
    }

    $this->response($message, 200);
}

//MODEL
function post_debate($Topic=NULL, $MainMedia='', $Category=NULL, $Creator=NULL){
    $MainMedia = ($MainMedia)?$MainMedia:'';
    $data = array(
                    'Topic' => $Topic,
                    'MainMedia' => $MainMedia,
                    'Category' => $Category,
                    'Creator' => $Creator,
                    'Created' => date('Y-m-d h:i:s')
                );
    return $this->db->insert('debate_table', $data);
}

---

好吧，显然使用文件名fileName:@"MainMedia"作为文件名留给我一个无扩展名的上传文件，这导致了服务器端的错误。 将".jpg"添加到"MainMedia.jpg"解决了这个问题。

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