Question

我正在使用Firebase Real Database准备iOS本机应用程序。

我大约有10万条数据。我需要显示最近的50条帖子，并在加载更多的下50条帖子之后，因此我实施了50条记录的分页仍然花费了很长时间（大约20-30秒））。

我还尝试使用索引在Firebase中使用规则。

仅供参考：可以处理1000条记录。

如何提高性能？

  let post_messagesReference = self.databaseRef.child(FirebaseTablePostMessages)
        var query = post_messagesReference.queryOrdered(byChild: kCreated)
        var lastKey = String()
        var createdVal = Int()
        if let last = self.endKeyCommunity.first {
            lastKey = last.id
            createdVal = Int(last.created)
        }

        //get first 50 records
        if self.endKeyCommunity.count == 0{
            query = query.queryLimited(toLast:50)
            self.showLoaderView()
        } else { //get next 50 records
            query = query.queryEnding(atValue: createdVal).queryLimited(toLast: 50)
        }
        query.observeSingleEvent(of: .value, with: { (snapshot) in
            guard let children = snapshot.children.allObjects.first as? DataSnapshot else { return }
            if snapshot.childrenCount > 0 {
                for child in snapshot.children.allObjects as! [DataSnapshot]{
                    guard case let communityChatDictionary as NSDictionary = child.value else { return }
                    if lastKey != child.key{
                    }
                guard case let communityChatDictionary as NSDictionary = children.value else { return }

            }

        }) { (error) in
  }

Answer 1

尝试更改Firebase规则，以便进行设置：

".read": "query.orderByKey &&
            query.limitToFirst <= 100"

删除此代码var query = post_messagesReference.queryOrdered(byChild: kCreated)。只需这样调用您的分页请求即可：

post_messagesReference.limitToFirst(50)
                  .orderByKey(kCreated)

从Firebase + iOS获取数据时加载数据的速度缓慢

1 个答案: