Question

我的firebase数据库结构如下：

Snap (-KWLSAIh5WJvNJOkxBEr) {
  beschrijving = "description";
  image = "link to image";
  title = "title";
}
Snap (-KWLSTak0H20X_2Qnanv) {
  beschrijving = "description";
  image = "link to image";
  title = "title";
}

这是我用来在TableView中显示它的代码：

import UIKit
import Firebase

class NieuwsTableViewController: UITableViewController {

var users = [UsersII]()
let cellId = "IdCell"

override func viewDidLoad() {
    super.viewDidLoad()

    fetchUser()
}
func fetchUser() {
    Database.database().reference().child("Blog").observe(.childAdded, with: { (snapshot) in

        if let dictionary = snapshot.value as? [String: AnyObject] {
            let user = UsersII(dictionary: dictionary)
            self.users.append(user)

            print(snapshot)


            DispatchQueue.main.async(execute: {
                self.tableView.reloadData()
            })

        }


    }, withCancel: nil)
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return users.count
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> lllTableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)

    let user = users.reversed()[indexPath.row]
    cell.textLabel?.text = user.name

    return cell as! lllTableViewCell
}

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let message = users.reversed()[indexPath.row]

    guard let beschrijving = message.beschrijving else {
        return
    }
    guard let image = message.plaatje else {
        return
    }
    guard let titel = message.name else {
        return
    }


    UserDefaults.standard.set(beschrijving, forKey: "nieuwsBeschrijving")
    UserDefaults.standard.set(image,forKey: "nieuwsPlaatje")
    UserDefaults.standard.set(titel, forKey: "nieuwsTitel")


    self.performSegue(withIdentifier: "gotonews", sender: nil)
}

}

我不知道你是否需要这个来回答这个问题，但我还会发布“UsersII”（在viewDidLoad方法之上定义为用户），以防需要回答这个问题。

 import UIKit

class UsersII: NSObject {
 var name: String?
 var beschrijving: String?
 var plaatje: String?
 init(dictionary: [String: Any]) {
    self.name = dictionary["title"] as? String ?? ""
    self.beschrijving = dictionary["beschrijving"] as? String ?? ""
    self.plaatje = dictionary["image"] as? String ?? ""
 }
}

所以我想要实现的是，如果你单击其中一个单元格，就会获得文章的父ID，所以在这种情况下，我将在我的firebase中提到“-KWLSAIh5WJvNJOkxBEr或-KWLSTak0H20X_2Qnanv”数据库结构。

Answer 1

以下是我要你做的事： 您的模型类：

class UsersII: NSObject {
var parentId: String?
var name: String?
var beschrijving: String?
var plaatje: String?
init(dictionary: [String: Any],parentId:String) {
 self.name = dictionary["title"] as? String ?? ""
 self.beschrijving = dictionary["beschrijving"] as? String ?? ""
 self.plaatje = dictionary["image"] as? String ?? ""
 self.parentId = parentId
 }
}

获取用户方法：

  func fetchUser() {
   Database.database().reference().child("Blog").observe(.childAdded,        with: { (snapshot) in

    if let dictionary = snapshot.value as? [String: AnyObject] {
        let user = UsersII(dictionary: dictionary,parentId:snapshot.key)
        self.users.append(user)

        print(snapshot)


        DispatchQueue.main.async(execute: {
            self.tableView.reloadData()
        })

    }


 }, withCancel: nil)
}

最后你做了选择：

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let message = users.reversed()[indexPath.row]

guard let beschrijving = message.beschrijving else {
    return
}
guard let image = message.plaatje else {
    return
}
guard let titel = message.name else {
    return
}

guard let parentId = message.name else
{
   return
 }

UserDefaults.standard.set(beschrijving, forKey: "nieuwsBeschrijving")
UserDefaults.standard.set(image,forKey: "nieuwsPlaatje")
UserDefaults.standard.set(titel, forKey: "nieuwsTitel")
UserDefaults.standard.set(parentId,forKey: "nieuwsParentId")

self.performSegue(withIdentifier: "gotonews", sender: nil)
 }

}

使用firebase在UITableview中获取父键

1 个答案: