Firebase中的查询排序顺序是什么？-Firebasequerysortorderinswift?

When I load the following Firebase Database data into my tableView, the data is sorted in ascending order by date. How can I order this by descending (show the newest post at the top)?

当我将以下Firebase数据库数据加载到我的tableView中时，数据按日期按升序排序。如何通过降序（在顶部显示最新的帖子）来订购？

Query in Xcode:

在Xcode中查询：

let ref = self.rootRef.child("posts").queryOrderedByChild("date").observeEventType(.ChildAdded, withBlock: { (snapshot) -> Void in

JSON export:

JSON导出：

"posts" : {
    "-KMFYKt7rmfZINetx1hF" : {
      "date" : "07/09/16 12:46 PM",
      "postedBy" : "sJUCytVIWmX7CgmrypqNai8vGBg2",
      "status" : "test"
    },
    "-KMFYZeJmgvmnqZ4OhT_" : {
      "date" : "07/09/16 12:47 PM",
      "postedBy" : "sJUCytVIWmX7CgmrypqNai8vGBg2",
      "status" : "test"
    },

Thanks!!

谢谢！！

EDIT: Below code is the entire solution thanks to Bawpotter

编辑：感谢Bawpotter，代码是完整的解决方案

Updated query:

更新的查询：

let ref = self.rootRef.child("posts").queryOrderedByChild("date").observeEventType(.ChildAdded, withBlock: { (snapshot) -> Void in

    let post = Post.init(key: snapshot.key, date: snapshot.value!["date"] as! String, postedBy: snapshot.value!["postedBy"] as! String, status: snapshot.value!["status"] as! String)

    self.posts.append(post)

    self.tableView.insertRowsAtIndexPaths([NSIndexPath(forRow: self.posts.count-1, inSection: 0)], withRowAnimation: .Automatic)

tableView cellForRowAtIndexPath

tableView cellForRowAtIndexPath

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("PostCell", forIndexPath: indexPath) as! PostCell

        self.posts.sortInPlace({$0.date > $1.date})
        self.tableView.reloadData()

Post.swift:

Post.swift：

import UIKit

class Post {
    var key: String
    var date: String
    var postedBy: String
    var status: String

    init(key: String, date: String, postedBy: String, status: String){
        self.key = key
        self.date = date
        self.postedBy = postedBy
        self.status = status
    }
}

2 个解决方案

yourDataArray.sort({$0.date > $1.date})

yourDataArray.sort(by: {$0.date > $1.date})

guard let value = snapshot.children.allObjects as? [FIRDataSnapshot] else {
                    return
}
var valueSorted: [FIRDataSnapshot] = [FIRDataSnapshot]()
var i: Int = value.count
while i > 0 {
    i = i - 1
    valueSorted.append(value[i])
}