我正在尝试将数据从我的云Firestore传递到我的表视图中，但是它无法检索数据并将其发布到表视图上，到目前为止，我的大多数尝试都失败了。因为我正在从实时数据库过渡到Firestore。
我在堆栈上使用了多种资源，多次重组了代码，现在归结为此
这也是我在Firestore firestore collection中收藏的图片
import Foundation
class ProductList {
var id: String?
var name: String?
var dispensaryName: String?
var category: String?,
var brand: String?
var imageUrl: String?
init(id: String?,
name: String?,
dispensaryName: String?,
brand: String?,
category: String?,
imageUrl: String?) {
self.id = id
self.name = name
self.dispensaryName = dispensaryName
self.brand = brand
self.category = category,
self.imageUrl = imageUrl
}
}
import UIKit
class ProductListCell: UITableViewCell {
@IBOutlet weak var productImage: UIImageView!
@IBOutlet weak var dispensaryName: UILabel!
@IBOutlet weak var productName: UILabel!
@IBOutlet weak var categoryLabel: UILabel!
@IBOutlet weak var categoryStrain: UILabel!
}
import UIKit
import Firebase
import FirebaseFireStore
class ProductListController: UIViewController {
@IBOutlet weak var productListTableView: UITableView!
@IBOutlet weak var menuButton: UIBarButtonItem!
var dbRef: DatabaseReference!
var productSetup: [ProductList] = []
override func viewDidLoad() {
super.viewDidLoad()
productListTableView.dataSource = self
productListTableView.delegate = self
self.productListTableView.rowHeight = UITableView.automaticDimension
self.productListTableView.estimatedRowHeight = 363
menuButton.target = self.revealViewController()
menuButton.action = #selector(SWRevealViewController.revealToggle(_:))
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
dbRef = Database.database().reference().child("products");
//observing the data changes
dbRef.observe(DataEventType.value, with: { (snapshot) in
//if the reference have some values
if snapshot.childrenCount > 0 {
//clearing the list
self.productSetup.removeAll()
//iterating through all the values
for producting in snapshot.children.allObjects as! [DataSnapshot] {
//getting values
let productObject = producting.value as? [String: AnyObject]
let id = productObject?["id"]
let name = productObject?["name"]
let dispensaryName = productObject?["dispensaryName"]
let category = productObject?["category"]
let strain = productObject?["strain"]
let imageUrl = productObject?["imageUrl"]
//creating artist object with model and fetched values
let massProducts = ProductList(id: id as! String?,
name: name as! String?,
dispensaryName: dispensaryName as! String?,
category: category as! String?,
strain: strain as! String?,
imageUrl: imageUrl as! String?)
//appending it to list
self.productSetup.append(massProducts)
}
//reloading the tableview
print(self.productSetup)
self.productListTableView.reloadData()
}
})
}
}
extension ProductListController: UITableViewDelegate, UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return productSetup.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ProductListCell") as!
ProductListCell
let production: ProductList
production = productSetup[indexPath.row]
cell.productName.text = "\(String(describing: production.brand)): \(String(describing: production.name))"
cell.dispensaryName.text = production.dispensaryName
cell.categoryLabel.text = production.category
cell.productImage.text = production.imageUrl
return cell
}
}
答案 0 :(得分：1)
我已快速重新格式化了代码，以使其更易于理解，但这可能是许多事情之一；
重新格式化的代码
ProductListController.swift
import Firebase
class ProductListController: UIViewController {
@IBOutlet weak var productListTableView: UITableView!
@IBOutlet weak var menuButton: UIBarButtonItem!
var productSetup = [ProductList]()
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
}
override func viewDidLoad() {
super.viewDidLoad()
productListTableView.dataSource = self
productListTableView.delegate = self
productListTableView.rowHeight = UITableView.automaticDimension
productListTableView.estimatedRowHeight = 363
menuButton.target = self.revealViewController()
menuButton.action = #selector(SWRevealViewController.revealToggle(_:))
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
fetchProducts { (products) in
self.productSetup = products
self.productListTableView.reloadData()
}
}
func fetchProducts(_ completion: @escaping ([ProductList]) -> Void) {
let ref = Firestore.firestore().collection("products")
ref.addSnapshotListener { (snapshot, error) in
guard error == nil, let snapshot = snapshot, !snapshot.isEmpty else {
return
}
completion(snapshot.documents.compactMap( {ProductList(dictionary: $0.data())} ))
}
}
}
extension ProductListController: UITableViewDelegate, UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return productSetup.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "ProductListCell") as?
ProductListCell else { return UITableViewCell() }
cell.configure(withProduct: productSetup[indexPath.row])
return cell
}
}
ProductListCell.swift
import Firebase
class ProductListCell: UITableViewCell {
@IBOutlet weak var productImage: UIImageView!
@IBOutlet weak var dispensaryName: UILabel!
@IBOutlet weak var productName: UILabel!
@IBOutlet weak var categoryLabel: UILabel!
@IBOutlet weak var categoryStrain: UILabel!
func configure(withProduct product: ProductList) {
productName.text = "\(String(describing: product.brand)): \(String(describing: product.name))"
dispensaryName.text = product.dispensaryName
categoryLabel.text = product.category
fetchImage(withURL: product.imageUrl ) { (image) in
productImage.image = image
}
}
func fetchImage(withURL url: String, _ completion: @escaping (UIImage) -> Void) {
let ref = Storage.storage().reference(forURL: url)
ref.getData(maxSize: 1 * 1024 * 1024) { (data, error) in
guard error == nil, let imageData = data, let image = UIImage(data: imageData) else {
return
}
completion(image)
}
}
}
ProductList.swift
class ProductList {
var id: String
var name: String
var dispensaryName: String
var category: String
var brand: String
var imageUrl: String
init(id: String, name: String, dispensaryName: String, brand: String, category: String, imageUrl: String) {
self.id = id
self.name = name
self.dispensaryName = dispensaryName
self.brand = brand
self.category = category
self.imageUrl = imageUrl
}
convenience init(dictionary: [String : Any]) {
let id = dictionary["id"] as? String ?? ""
let name = dictionary["name"] as? String ?? ""
let dispensaryName = dictionary["dispensaryName"] as? String ?? ""
let brand = dictionary["brand"] as? String ?? ""
let category = dictionary["category"] as? String ?? ""
let imageUrl = dictionary["imageUrl"] as? String ?? ""
self.init(id: id, name: name, dispensaryName: dispensaryName, brand: brand, category: category, imageUrl: imageUrl)
}
}
希望您发现这有帮助。