ios - AFNetworking 在 post 请求的 JSON 参数中发送数组

Question

我正在尝试通过 POST 将参数发送到我的服务器，它通常可以正常工作，但我不知道如何发送包含数组作为参数之一的 JSON。这是我尝试过的:

AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:myURL]];
NSMutableArray *objectsInCart = [NSMutableArray arrayWithCapacity:[_cart count]];
for(NSDictionary *dict in _cart)
{
    NSObject *object = [dict objectForKey:@"object"];
    NSDictionary *objectDict = @{@"product_id": [NSString stringWithFormat:@"%d",[object productID]],
                                 @"quantity": [NSString stringWithFormat:@"%d", [[dict objectForKey:@"count"] intValue]],
                                 @"store_id": [NSString stringWithFormat:@"%d", [Store getStoreID]],
                                 @"price": [NSString stringWithFormat:@"%.2f", [object price]]};
    [objectsInCart addObject:objectDict];
}
NSError *error = nil;
NSString *cartJSON = [[NSString alloc] initWithData:[NSJSONSerialization dataWithJSONObject:objectsInCart
                                                                                    options:NSJSONWritingPrettyPrinted
                                                                                      error:&error]
                                           encoding:NSUTF8StringEncoding];

if(error)
{
    NSLog(@"Error serializing cart to JSON: %@", [error description]);
    return;
}

NSDictionary *parameters = @{@"status": @"SUBMITTED",
                             @"orders": cartJSON};

NSMutableURLRequest *orderRequest = [httpClient requestWithMethod:@"POST"
                                                             path:@"/app/carts"
                                                       parameters:parameters];

AFJSONRequestOperation *JSONOperation = [[AFJSONRequestOperation alloc] initWithRequest:orderRequest];

但是，发送此 JSON 时出现错误。非常感谢任何建议!

Answer 1

我看不到您指定要发布 JSON 的位置，所以我打赌您发送的是表单 URL 参数编码，根据 AFHTTPClient 文档，它是这样的:

If a query string pair has a an NSArray for its value, each member of the array will be represented in the format field[]=value1&field[]=value2. Otherwise, the pair will be formatted as "field=value". String representations of both keys and values are derived using the -description method. The constructed query string does not include the ? character used to delimit the query component.

如果您的服务器确实希望您发布 JSON，请将其添加到第二行以告知 AFNetworking:

// AFNetworking 1.0
// httpClient is a subclass of AFHTTPClient
httpClient.parameterEncoding = AFJSONParameterEncoding;

// AFNetworking 2.0
// httpClient is a subclass of AFHTTPRequestOperationManager or AFHTTPSessionManager
httpClient.requestSerializer = AFJSONRequestSerializer;

然后您将删除对 NSJSONSerialization 的调用，并将 objectsInCart 放入 parameters 字典中。

旁注:子类化 AFHTTPRequestOperationManager 或 AFHTTPSessionManager (AFNetworking 2.0) 或 AFHTTPClient (AFNetworking 1.0) 并把这种类型的initWithBaseURL: 方法中的配置。 (您可能不想为每个请求启动一个新客户端。)