使用swift (Firebase数据库)更新帖子中的点赞数量

import Firebase

let postRef = Database.database().reference().child("posts").child(postId)

postRef.runTransactionBlock({ (currentData: MutableData) -> TransactionResult in
    if var post = currentData.value as? [String: Any], let likes = post["likes"] as? Int {
        var updatedLikes = likes + 1
        post["likes"] = updatedLikes
        currentData.value = post
        return TransactionResult.success(withValue: currentData)
    }
    return TransactionResult.success(withValue: currentData)
}) { (error, committed, snapshot) in
    if let error = error {
        print("点赞数量更新失败：\(error.localizedDescription)")
    } else {
        print("点赞数量更新成功")
    }
}

{
  "posts" : {
    "postId1" : {
      "likes" : 10,
      // 其他帖子信息
    },
    // 其他帖子
  }
}