Question

我正在尝试获取first key "A" objective C值而未提及使用NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves | NSJSONReadingMutableContainers error:&error]; NSDictionary *response = [JSON[@"response"]firstObject]; response = { A = { company = ( { no = "115"; student = "Mich"; school = ( { grade = A; } ); test = "<null>"; office = tx; } ); }; }的{{1}}的关键名称。我无法准确到达，请帮助我从下面回复。

val authWithHeader = headerValueByName("Access_Token")
  .flatMap(accessToken => authenticate(validate(accessToken)))

val authenticatedJsonRoute = cors &
  authWithHeader &
  headerValueByName("Tenant_Name") &
  respondWithMediaType(MediaTypes.`application/json`)

override val getLayer =
  (get & path("api" / Segment / "model" / "layers")) { modeledSystemName =>
    authenticatedJsonRoute { (authInfo, tenantName) =>
      onComplete(service.getlayers(modeledSystemName, tenantName)) {
        case Success(layers) => complete(layers)
        //case Success(None) => complete(NotFound, "Release version not found")
        case Failure(ex) => complete(InternalServerError, s"An error occurred: ${ex.getMessage}")
      }
    }
  }

Answer 1

根据您的具体要求，有几种方法可以做到这一点。如果您只需要访问JSON[@"response"]中每个密钥的值，则可以枚举JSON字典：

[JSON enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
    NSDictionary *dict = (NSDictionary *)obj;

    ...

    if (shouldStop) { // whatever condition you want, if any
        *stop = YES;
    }
}];

如果您需要某种订购，则需要使用[JSON allKeys]：

NSArray *keys = [[JSON allKeys] sortedArrayUsing...];  // Use whichever sort method you like
for (NSString *key in keys) {
    NSDictionary *dict = JSON[key];

    ...
}

如果您想要的只是值，则可以使用[JSON allValues]。如果需要排序。

如何使用Objective C从Json响应中获取特定值？

1 个答案: