TableView在Xcode中不显示Firebase数据Swift

问题描述

我正在使用Xcode 11尝试在Firebase中以表视图显示“发布”数据，并且我已经测试了使用打印功能调用信息的方法。

这是我用于表视图控制器的代码：

@Transactional

这是postCell的代码：

import UIKit
import Firebase
import FirebaseDatabase
import SwiftKeychainWrapper
import FirebaseAuth

class FeedVC: UITableViewController {
    
    var currentUserImageUrl: String!
    var posts = [Post]()
    var selectedPost: Post!

    override func viewDidLoad() {
        super.viewDidLoad()
        getUsersData()
        getPosts()
        // Do any additional setup after loading the view.
        
    }

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

        guard let userID = Auth.auth().currentUser?.uid else { return }
        Database.database().reference().child("users").child(userID).observeSingleEvent(of: .value) { (snapshot) in
            if let postDict = snapshot.value as? [String : AnyObject] {
                self.tableView.reloadData()
            }
        }
    }
    
    func getPosts() {
        Database.database().reference().child("textPosts").observeSingleEvent(of: .value) { (snapshot) in
            guard let snapshot = snapshot.children.allObjects as? [DataSnapshot] else { return }
            self.posts.removeAll()
            for data in snapshot.reversed() {
                guard let postDict = data.value as? Dictionary<String,AnyObject> else { return }
                let post = Post(postKey: data.key,postData: postDict)
                print(DataSnapshot.self)
                self.posts.append(post)
            }
            self.tableView.reloadData()
        }
    }
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    override func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
        return posts.count
    }
    
    override func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "postCell") as? PostCell else { return UITableViewCell() }
        
        cell.configCell(post: posts[indexPath.row])
        return cell
    }
}

这是关于邮政的：

import UIKit
import Firebase
import FirebaseStorage
import FirebaseDatabase
import SwiftKeychainWrapper

class PostCell: UITableViewCell {
    
    @IBOutlet weak var userImg: UIImageView!
    @IBOutlet weak var username: UILabel!
    @IBOutlet weak var postText: UILabel!
    @IBOutlet weak var commentBtn: UIButton!
    
    var post: Post!
    let currentUser = KeychainWrapper.standard.string(forKey: "uid")
    
    func configCell(post: Post) {
        self.post = post
        self.username.text = post.username
        self.postText.text = post.postText
        print(self.post)
        print(self.post.username)
        
        let ref = Storage.storage().reference(forURL: post.userImg)
        ref.getData(maxSize: 100000000,completion: { (data,error) in
            if error != nil {
                print("Couldnt load img")
            } else {
                if let imgData = data {
                    if let img = UIImage(data: imgData){
                        self.userImg.image = img
                    }
                }
                }
        })
    }} 

我已经坚持了一段时间，任何帮助将不胜感激！

解决方法

这是更新的代码，但仍不显示任何内容：

import Firebase
import FirebaseDatabase
import SwiftKeychainWrapper
import FirebaseAuth

class FeedVC: UITableViewController {
    
    var currentUserImageUrl: String!
    var posts = [Post]()
    var selectedPost: Post!

    override func viewDidLoad() {
        super.viewDidLoad()
        getUsersData()
        getPosts()
        // Do any additional setup after loading the view.
        
    }

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

        guard let userID = Auth.auth().currentUser?.uid else { return }
        Database.database().reference().child("users").child(userID).observeSingleEvent(of: .value) { (snapshot) in
            if let postDict = snapshot.value as? [String : AnyObject] {
                self.tableView.reloadData()
            }
        }
    }
    
    func getPosts() {
        Database.database().reference().child("textPosts").observe(.value) { (snapshot) in
            guard let snapshot = snapshot.children.allObjects as? [DataSnapshot] else { return }
            self.posts.removeAll()
            for data in snapshot.reversed() {
                guard let postDict = data.value as? Dictionary<String,AnyObject> else { return }
                let post = Post(postKey: data.key,postData: postDict)
                print(DataSnapshot.self)
                self.posts.append(post)
            }
            
            DispatchQueue.main.async{
            self.tableView.reloadData()
        }
    }
    }
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    override func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
        return posts.count
    }
    
    override func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "PostCell") as? PostCell else { return UITableViewCell() }
        cell.configCell(post: posts[indexPath.row])
        return cell
    }



}`

,

您是否检查了数据源方法是否被调用？ 另外，请确认您的单元格是否有高度。