Cannot fetch data from google-cloud-firestore correctly - swift

Question

No problems with fetching Title and Subtitle. Problems are with downloading of images and streaming the video. I really appreciate your help friends. I just want to learn how to implement it correctly and what to use, get data method or listener? Does it need grammatical changes of my code or a pair of code lines?
import UIKit
import AVKit
import AVFoundation
import FirebaseFirestore
import Combine
class ListOfVideoLessonsTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
let pinchGesture = UIPinchGestureRecognizer()
private var viewModel = VideosViewModel()
private var cancellable: AnyCancellable?
var player = AVPlayer()
var playerViewController = AVPlayerViewController()
#IBOutlet var table: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
self.viewModel.fetchData()
self.title = "Video Lessons"
table.delegate = self
table.dataSource = self
cancellable = viewModel.$videos.sink { _ in
DispatchQueue.main.async{
self.table.reloadData()
}
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
print("videos count = ", viewModel.videos.count)
return viewModel.videos.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let video = viewModel.videos[indexPath.row]
tableView.tableFooterView = UIView()
//configure cell
cell.textLabel?.text = video.name
cell.detailTextLabel?.text = video.lessonName
cell.accessoryType = .disclosureIndicator
let image = UIImage(data: video.imageData)
cell.imageView?.image = image...
imageName!.withRenderingMode(.alwaysTemplate)
let backgroundView = UIView()
backgroundView.backgroundColor = UIColor(named: "VideoLessonsCellHighlighted")
cell.selectedBackgroundView = backgroundView
cell.textLabel?.font = UIFont(name: "Helvetica-Bold", size: 14)
cell.detailTextLabel?.font = UIFont(name: "Helvetica", size: 12)
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 100
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
playVideo(at: indexPath)
}
func tableView(_ tableView: UITableView, didHighlightRowAt indexPath: IndexPath) {
if let cell = tableView.cellForRow(at: indexPath) {
cell.contentView.backgroundColor = UIColor(named: "VideoLessonsCellHighlighted")
cell.textLabel?.highlightedTextColor = UIColor(named: "textHighlighted")
cell.detailTextLabel?.highlightedTextColor = UIColor(named: "textHighlighted")
}
}
func tableView(_ tableView: UITableView, didUnhighlightRowAt indexPath: IndexPath) {
if let cell = tableView.cellForRow(at: indexPath) {
cell.contentView.backgroundColor = nil
}
}
func playVideo(at indexPath: IndexPath){
let selectedVideo = viewModel.videos[indexPath.row]
let videoURL = URL(string: selectedVideo.fileURL)
player = AVPlayer(url: videoURL!)
playerViewController.player = player
self.present(playerViewController, animated: true, completion: {
self.playerViewController.player?.play()
})
}
}
This is the VideosViewModel which supposed to download data from firestore database and translate into local file names if I am not mistaken.
import Foundation
import FirebaseFirestore
class VideosViewModel: ObservableObject {
#Published var videos = [Video]()
private var db = Firestore.firestore()
static func downloadImage(withURL url: URL, completion: #escaping (_ _image:UIImage?)->()) {
let dataTask = URLSession.shared.dataTask(with: url) { data, url, error in
var downloadedImage:UIImage?
if let data = data {
downloadedImage = UIImage(data: data)
}
DispatchQueue.main.async {
completion(downloadedImage)
}
}
dataTask.resume()
}
func fetchData() {
db.collection("videos").addSnapshotListener { [self] (querySnapshot, error) in
guard let documents = querySnapshot?.documents else {
print("No Documents")
return
}
self.videos = documents.map { (queryDocumentSnapshot) -> Video in
let data = queryDocumentSnapshot.data()
let name = data["name"] as? String ?? ""
let imageName = data["imageName"]as? URL ?? ""
let lessonName = data["lessonName"] as? String ?? ""
let fileURL = data["fileURL"] as? String ?? ""
print(data)
return Video(name: name, imageName: imageName, lessonName: lessonName, fileURL: fileURL)
}
}
}
}
import Foundation
struct Video {
var name: String
var imageName: Data
var lessonName: String
var fileURL: String
}```
[1]: https://i.stack.imgur.com/YIU5O.png