iOS:-[__NSCFString allKeys]:无法识别的选择器发送到实例 0x7976c750

Question

现在我知道这意味着它正在尝试获取 NSString 中的所有键，这是不可能的。但是，我不知道为什么我的字典是 NSString。

return [requestManager POST:@"/api/showData"
                           parameters:params
                              success:^(AFHTTPRequestOperation *operation, id responseObject) {

                                  NSLog(@"the response object%@",responseObject);

                                  NSMutableArray *responseObjects = [[NSMutableArray alloc] init];
                                  for (NSDictionary *node in responseObject) {
                                      Model *data = [[Model alloc] initWithDictionary:node];
                                      [responseObjects addObject:data];
                                  }
                                  handler(YES,responseObjects);

                              } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                  handler(NO,nil);
                              }];

此代码向服务器发送请求，我收到以下成功响应

the response object{ "error_code" = 1; message = "nothing found"; status = error; }

在我的模型类的 initWithDictionary 方法中，这就是我所拥有的

   //Model Class
 - (id)initWithDictionary:(NSDictionary *)dict{
      self = [super init];
      if (self) {
       NSLog(@"the dict is %@",dict);
      if ([[dict allKeys] containsObject:@"error_code"]) {

          }
         return self;
       }

上面的行是导致我的问题的原因。我用这个方法记录了字典，这就是我得到的

"the dict is status"

Answer 1

您需要检查您是否正在获取字典或数组(包含多个字典)作为您的responseObject，

return [requestManager POST:@"/api/showData"
                parameters:params
                   success:^(AFHTTPRequestOperation *operation, id responseObject) {

                       NSLog(@"the response object%@",responseObject);
                       NSMutableArray *responseObjects = [[NSMutableArray alloc] init];

                       if ([responseObject isKindOfClass:[NSDictionary class]]) {
                           Model *data = [[Model alloc] initWithDictionary:responseObject];
                           [responseObjects addObject:data];
                       } else if ([responseObject isKindOfClass:[NSArray class]]) {
                           for (NSDictionary *node in responseObject) {
                               Model *data = [[Model alloc] initWithDictionary:node];
                               [responseObjects addObject:data];
                           }
                       }
                       handler(YES,responseObjects);

                   } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                       handler(NO,nil);
                   }];