iphone - AFNetworking POST 已创建但空白

Question

我正在构建一个 Rails 支持的 ios 应用程序，它使用 AFNetworking 将内容发布到服务器。用户可以上传带有评论的照片 - 这很有效。我还希望能够选择让用户只上传文本——这就是我遇到麻烦的地方。我有一种保存照片和文本的方法，还有另一种仅保存文本的方法。保存照片方法有效，但保存文本方法创建帖子但文本为空。保存照片的实现是这样的:

- (void)savePhotoAtLocation:(CLLocation *)location
                     withBlock:(void (^)(CGFloat))progressBlock completion:(void (^)(BOOL, NSError *))completionBlock {

if (!self.content) self.content = @"";

NSDictionary *params = @{
                         @"post[content]" : self.content,
                         @"post[lat]": @(location.coordinate.latitude),
                         @"post[lng]": @(location.coordinate.longitude)

                         };

NSURLRequest *postRequest = [[APIClient sharedClient] multipartFormRequestWithMethod:@"POST"                                                                               path:@"/posts" parameters:params 
    constructingBodyWithBlock:^(id<AFMultipartFormData> formData)
                                          {
                                              [formData appendPartWithFileData:self.photoData
                                                                          name:@"post[photo]"
                                                                      fileName:@""
                                                                      mimeType:@"image/png"];
                                          }];
    AFHTTPRequestOperation *operation = [[AFJSONRequestOperation alloc] initWithRequest:postRequest];

此方法仅在有照片数据时有效 - 如果没有照片数据，应用程序将崩溃。所以我想知道什么相当于 multipartFormRequest- 只允许包含一个字符串？这就是我现在所拥有的 - 它创建了一个 post- 但返回内容:以及应该与当前位置一起返回的 lat/lng 参数。这是在 post 模型中定义的

- (void)savePostAtLocation:(CLLocation *)location
    withBlock:(void (^)(CGFloat progress))progressBlock completion:(void (^)(BOOL success, NSError *error))completionBlock {

    if (!self.content) self.content = @"";

    NSDictionary *params = @{
                             @"post[content]" : self.content,
                             @"post[lat]" : @(location.coordinate.latitude),
                             @"post[lng]" : @(location.coordinate.longitude)
                                  };

    NSURLRequest *postRequest = [[APIClient sharedClient]requestWithMethod:@"POST" path:@"/posts" parameters:params];

    AFHTTPRequestOperation *operation = [[AFJSONRequestOperation alloc] initWithRequest:postRequest];

        [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        if (operation.response.statusCode == 200 || operation.response.statusCode == 201) {
            NSLog(@"Created, %@", responseObject);
            NSDictionary *updatedPost = [responseObject objectForKey:@"post"];
            [self updateFromJSON:updatedPost];
            [self notifyCreated];
            completionBlock(YES, nil);
        } else {
            completionBlock(NO, nil);
        }
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        completionBlock(NO, error);
        }];

    [[APIClient sharedClient] enqueueHTTPRequestOperation:operation];
}

并在 AddPostViewController save 中调用:

- (void)save:(id)sender

{
    CLLocationManager * locationManager = [[CLLocationManager alloc] init];
    self.locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
    self.locationManager.distanceFilter = 80.0f;
    [locationManager startUpdatingLocation];
    [self getLocation];
    CLLocation * location = [locationManager location];

    Post *post = [[Post alloc] init];
    post.content = self.contentTextField.text;

    [self.view endEditing:YES];

    ProgressView *progressView = [ProgressView presentInWindow:self.view.window];
    if (location) {

    [post savePostAtLocation:self.locationManager.location withBlock:^(CGFloat progress) {
        [progressView setProgress:progress];
    } completion:^(BOOL success, NSError *error) {
        [progressView dismiss];
        if (success) {
            [self.navigationController popViewControllerAnimated:YES];
        } else {
            NSLog(@"ERROR: %@", error);
        }
    }];
    } else {
        NSLog(@"No Location");
    }
}

这是创建帖子后的日志。正如您所看到的，属性为空且不应该为空。

Created, {
    post =     {
        content = "<null>";
        "created_at" = "2013-07-21T18:45:12Z";
        id = 13;
        lat = "<null>";
        lng = "<null>";

    success = 1;
}

因此，创建帖子但属性为空的事实让我认为问题出在 NSURLRequest 中，并且我没有完全实现 AFNetworking 协议(protocol)，但我一直无法找到一种方法实现一个不需要 fileData 的 post 请求。如何发出不附加 fileData 的发布请求？任何帮助将不胜感激。谢谢!

Answer 1

您可以复制现有方法，但不使用 appendPartWithFileData:name:fileName:mimeType: 来设置文件数据，您可以将参数转换为数据并使用 appendPartWithFormData:name: 添加它们: 。