ios - 使用 Swift 的 Firebase 用户收件箱

Question

我正在尝试为我的应用程序中的用户创建一个收件箱。然而，我在重新加载 tableView 时遇到问题。如果我删除 self.tabelView.reloadData()应用程序 View 运行良好，但当然不会更新表格单元格。查询确实成功了，因为我可以打印结果数组。我收到的错误是 LLDB 错误。它指出“EXC_BreakPoint”，我没有设置任何断点。这是我的代码:

class InboxTableViewController: UITableViewController {

var pinggedUser: String!

var toBeUserId: String!


let dataBase = FIRDatabase.database()

var SecondResultArray: [FIRDataSnapshot]! = []



override func viewDidLoad() {



      messageReference = rootReference.child("messages")

    //let UserRef = messageReference.child((FIRAuth.auth()?.currentUser?.displayName)!)

    messageReference.queryOrderedByChild("senderName")
        .observeSingleEventOfType(.Value, withBlock:{ snapshot in
            for child in snapshot.children {


                self.SecondResultArray.append(child as! FIRDataSnapshot)
                //print(self.ResultArray)


            }

            print(self.SecondResultArray )

                self.tableView.reloadData()


        })


    super.viewDidLoad()

    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem()
}



override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return SecondResultArray.count
}


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

    // Configure the cell...

    let inBox: FIRDataSnapshot! = self.SecondResultArray[indexPath.row]

    let book = inBox.value as! Dictionary<String, String>



    let receiver = book["receiver"] as String!

    let senderId = book["senderId"] as String!

    let messageText = book["text"] as String!


    let senderName = book["senderName"] as String!


    cell.textLabel?.numberOfLines = 0
    cell.textLabel?.lineBreakMode = NSLineBreakMode.ByWordWrapping



    cell.textLabel?.text = "Your Messages With:" + "" + senderName


    return cell
}


 }

Answer 1

可能是您没有注册您的桌面 View 。

self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")