从firebase读取数据并填充TableViewCell

你好，我有一个tableviewcell，我可以用我的电脑上的自定义数据填充它，但我不能在我已经制作的单元格上使用我的firebase数据。 我想用String和Int填充我的单元格，而不仅仅是字符串。 我的代码是：

PlacesTableViewController类

import UIKit import FirebaseDatabase class PlacesTableViewController: UITableViewController { //MARK: Properties @IBOutlet weak var placesTableView: UITableView! //database reference var dbRef:FIRDatabaseReference? var places = [Places]() var myList:[String] = [] //handler var handle:FIRDatabaseHandle? override func viewDidLoad() { super.viewDidLoad() dbRef = FIRDatabase.database().reference() // Loads data to cell. loadData() } // MARK: - Table view data source override func numberOfSections(in tableView: UITableView) -> Int { return 1 } override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { // #warning Incomplete implementation, return the number of rows return places.count //return myList.count } override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { // Table view cells are reused and should be dequeued using a cell identifier. let cellIdentifier = "PlacesTableViewCell" guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? PlacesTableViewCell else { fatalError("The dequeued cell is not an instance of PlacesTableView Cell.") } let place = places[indexPath.row] cell.placeLabel.text = place.name cell.ratingControl.rating = place.rating //cell.placeLabel.text = myList[indexPath.row] //cell.ratingControl.rating = myRatings[indexPath.row] return cell } //MARK: Private Methods private func loadData() { handle = dbRef?.child("placeLabel").observe(.childAdded, with: { (snapshot) in if let item = snapshot.value as? String { self.myList.append(item) self.placesTableView.reloadData() print (item) } }) /* handle = dbRef?.child("rating").observe(.childAdded, with: { (snapshot) in if let item = snapshot.value as? String { self.myList.append(item) self.placesTableView.reloadData() } })*/ /*guard let place1 = Places(name: "Veranda", rating: 4) else { fatalError("Unable to instantiate place1") } places += [place1]*/ } } 

地方类

 import UIKit class Places { //MARK: Properties var name: String var rating: Int //MARK:Types struct PropertyKey { static let name = "name" static let rating = "rating" } //MARK: Initialization init?(name: String, rating: Int) { // Initialize stored properties. self.name = name self.rating = rating // Initialization should fail if there is no name or if the rating is negative. // The name must not be empty guard !name.isEmpty else { return nil } // The rating must be between 0 and 5 inclusively guard (rating >= 0) && (rating <= 5) else { return nil } } } 

PlacesTableViewCell类

 import UIKit import FirebaseDatabase class PlacesTableViewCell: UITableViewCell, UITableViewDelegate { //MARK: Properties @IBOutlet weak var placeLabel: UILabel! @IBOutlet weak var ratingControl: RatingControl! override func awakeFromNib() { super.awakeFromNib() // Initialization code } override func setSelected(_ selected: Bool, animated: Bool) { super.setSelected(selected, animated: animated) // Configure the view for the selected state } } 

Firebase数据库

Answer 1

假设您的数据库布局应该如下所示（请参阅上面的注释 ）：

 ... placeLabel | -- XXY: "Veranda" -- YYY: "Dio Con Dio" rating | -- XXX: 4 -- YYY: 1 ... 

然后尝试这个：

 private func loadData() { dbRef!.child("placeLabel").observe(.childAdded) { (snapshot) in let label = snapshot.value as! String self.updatePlace(snapshot.key, label: label) } dbRef!.child("rating").observe(.childAdded) { (snapshot) in let rating = snapshot.value as! Int self.updatePlace(snapshot.key, rating: rating) } } private var loadedLabels = [String: String]() private var loadedRatings = [String: Int]() private func updatePlace(_ key: String, label: String? = nil, rating: Int? = nil) { if let label = label { loadedLabels[key] = label } if let rating = rating { loadedRatings[key] = rating } guard let label = loadedLabels[key], let rating = loadedRatings[key] else { return } if let place = Places(name: label, rating: rating) { places.append(place) placesTableView.reloadData() } } 

顺便说一下，如果你想快速validation上面的解决方案，你可以暂时破解你的数据库 – 使用Firebase（不错！）web控制台。

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写入数据库 。 尝试使用以下代码在数据库中编写节点（即，此代码在所有场所属性中重用相同的键）：

 let key = dbRef!.child("placeLabel").childByAutoId().key dbRef!.child("placeLabel").child(key).setValue(placeLab‌​el.text) dbRef!.child("comment").child(key).setValue(commentText‌​Field.text) dbRef!.child("rating").child(key).setValue(ratingContro‌​l.rating) 

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黑客攻击数据库 。 要手动编辑数据库，请尝试：

1. 打开http://console.firebase.google.com
2. 选择你的应用
3. 打开数据库选项
4. 使用正确的密钥添加新节点
5. 删除旧节点