通过 AFHTTPClient 调用接收错误响应

Question

按照文档中的建议，我将 AFHTTPClient 实现为单例类，并在帖子中使用 JSON 数据调用它，并接收 JSON 数据作为回报：

[[BMNetworkCalls sharedInstance] postPath:theURL parameters:theDict success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"my return is: %@", [responseObject valueForKeyPath:@"Result"]);

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {            
    NSLog(@"error in network call: %@", [error localizedDescription]);
}];

一切都很好，但是如果我收到一个错误，（“HTTPRequestOperation 中的错误：(200-299) 中的预期状态代码，得到 400”），我实际上 想要 读取 responseObject这里也是（这是我使用的 API 告诉我我造成了哪类错误的方式）。

我可以使用 AFJSONRequestOperation 做到这一点：

AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
    NSLog(@"my return is: %@", [JSON valueForKeyPath:@"Result"]);

} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
    NSLog(@"exception code: %@", [JSON valueForKeyPath:@"ExceptionCode"]);
    NSLog(@"exception message: %@", [JSON valueForKeyPath:@"ExceptionMessage"]);
}];
[operation start];

我如何（并且我可以？）使用 AFHTTPClient 来做到这一点？

Answer 1

operation 变量包含您需要的一切：

[[BMNetworkCalls sharedInstance] postPath:theURL parameters:theDict success:^(AFHTTPRequestOperation *operation, id responseObject) {
  // ...
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    if ([operation isKindOfClass:[AFJSONRequestOperation class]]) {
      id JSON = [(AFJSONRequestOperation *)operation responseJSON];
      NSLog(@"JSON: %@", JSON)
    }
}];

Answer 2

所有功劳归于@phix23，他为我指明了正确的方向！

这是我在子类 AFHTTPClient 中编写的自定义方法，它允许我在收到 400 错误后查看 JSON 响应：

- (void) myPostPath:(NSString *)path
        parameters:(NSDictionary *)parameters
           success:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, id JSON))success 
           failure:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON))failure
{
    NSURLRequest *request = [self requestWithMethod:@"POST" path:path parameters:parameters];   
    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:success failure:failure];
    [self enqueueHTTPRequestOperation:operation];
}

我叫它：

[[BMNetworkCalls sharedInstance] myPostPath:theURL parameters:theDict success:^(NSURLRequest *request, NSHTTPURLResponse *response, id responseObject) {
    NSLog(@"my return is: %@", [responseObject valueForKeyPath:@"Result"]);

} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {          
    NSLog(@"exception code: %@", [JSON valueForKeyPath:@"ExceptionCode"]);
}];