ios - 使用 AFNetworking 如何读取 request.responseString 中包含的错误消息

Question

NSLog(@"%@", request.responseString);

这给了我的输出{"errors":{"email":["is already taken"]}}。

我想将电子邮件和消息字符串保存"is already taken"为字符串以显示在警报中。如何将这两个项目访问到两个字符串中？

Answer 1

响应字符串是服务器的原始输出。在这种情况下，它是 JSON 编码的。您可以使用 AFNetworking JSON 特定类之一（即AFJSONRequestOperation）将响应作为 JSON 对象返回，或者使用NSJSONSerialization. 我建议使用AFJSONRequestOperation.

Answer 2

 NSData *data = [request.responseString dataUsingEncoding:NSUTF8StringEncoding];

 id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
 NSString *str = [[json objectForkey:@"errors"] objectForKey:@"email"][0];

Answer 3

我使用了以下，似乎更强大一点：

[requestOperation setCompletionBlockWithSuccess:success failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        id response = error.userInfo;
    if (response && [response isKindOfClass:[NSDictionary class]]) {
        NSDictionary *responseDictionary = (NSDictionary *)response;

        // AFNetworking hides the actual error response under this key 
        if ([responseDictionary valueForKey:NSLocalizedRecoverySuggestionErrorKey]) {
            id suggestedRecovery = [responseDictionary valueForKey:NSLocalizedRecoverySuggestionErrorKey];

            if ([suggestedRecovery isKindOfClass:[NSString class]]) {
                // Try to json decode string
                id json = [NSJSONSerialization JSONObjectWithData:[suggestedRecovery dataUsingEncoding:NSUTF8StringEncoding] options:0 error:nil];
                if (json && [json isKindOfClass:[NSDictionary class]]) {
                    responseDictionary = json;
                }
            }
        }

        // .. extract error message out of responseDictionary
    }
    }];

Answer 4

    NSData *responseData = [[error userInfo] objectForKey:@"data"];
    if ([responseData length] > 0)
    {

     NSString *str = [[NSString alloc] initWithData:responseData                                                                                encoding:NSUTF8StringEncoding];
      NSLog(@"%@", str);
    }