解决AFNetworking升级后出现的Unable to co

先要确定是哪个引起的不能解析。

/**单例一个AFHTTPSessionManager*/
+ (AFHTTPSessionManager *)defaultManager{
    static AFHTTPSessionManager *manager;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        manager = [AFHTTPSessionManager manager];
        //设置接受解析的内容
        manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/html",@"text/json",@"text/plain",@"text/javascript",@"application/json", nil];
//需要驾驶下面两行
        manager.requestSerializer = [AFHTTPRequestSerializer serializer];
        manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    });
    return manager;
}

+(id)GET:(NSString *)path parameters:(NSDictionary *)params completionHandle:(void (^)(id _Nonnull, NSError * _Nullable))completed{
    NSLog(@"Request Method:GET,Path:%@,params:%@",path,params);
    return [[self defaultManager] GET:path parameters:params progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
      NSLog(@"%@",task.response);//打印头文件，确定编码方式
       //关键代码 
        NSError * error;
        NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding (kCFStringEncodingGB_18030_2000);
        NSString* strdata = [[NSString alloc]initWithData:responseObject encoding:enc];//在将NSString类型转为NSData
        
        NSData * data = [strdata dataUsingEncoding:NSUTF8StringEncoding];//这样解决的乱码问题。
        
        NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error ];
        
        NSLog(@"%@",json);
        completed(json,nil);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"GET ERROR:%@",error.userInfo);
    }];
   
}