Domain=NSCocoaErrorDomain Code=3840 "Unescaped control character around character 203." UserInfo={NS

error = Error Domain=NSCocoaErrorDomain Code=3840 "Unescaped control character around character 203." UserInfo={NSDebugDescription=Unescaped
control character around character 203.}

json在做请求数据解析的时候，部分数据控制台会输出上面的一串代码，大概意思是，持有控制字符，在**字节处。出现这个问题的原因就是：因为服务器返回的字符串里面有换行符，所以我们要在接收到的数据里面，将换行符替换掉，然后再转模型。但是AFN的GET
或者POST里面并没有提供给我们相应的数据，所以就直接进入了

 failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error)
block块，输出了错误信息。我是这样解决的：手动过滤掉 “\t” “\n” “\r”

NSURL * URL = [NSURL
URLWithString:@"http://*********/****/home/content/showarticle"];

    NSURLRequest * request = [NSURLRequest
requestWithURL:URL];

    NSURLSession * session = [NSURLSession
sharedSession];

    NSURLSessionDataTask * dataTask = [session
dataTaskWithRequest:request
completionHandler:^(NSData *
_Nullable data, NSURLResponse *
_Nullable response,
NSError * _Nullable error) {

        NSString * str = [[NSString
alloc]initWithData:data
encoding:NSUTF8StringEncoding];

        NSString * str2 = [str
stringByReplacingOccurrencesOfString:@"\t"
withString:@""];

        str2 = [str2 stringByReplacingOccurrencesOfString:@"\n"
withString:@""];

        str2 = [str2 stringByReplacingOccurrencesOfString:@"\r"
withString:@""];

    

    NSDictionary * userInfo = [NSJSONSerialization
JSONObjectWithData:[str2
dataUsingEncoding:NSUTF8StringEncoding]
options:NSJSONReadingMutableLeaves
error:nil];

        NSLog(@"%@",userInfo);

    }];

    [dataTask resume];

}
输出的字典直接解析即可