How to show data in my application? Swift and Firebase - ios

Question

I am facing a problem in my application. When I run my application in the emulator, I don't get any data and just a white screen.
I decided to use Firestore as a backend. Below I provide the code and hope you can help me.
ViewController
class ViewController: UIViewController {
#IBOutlet weak var cv: UICollectionView!
var channel = [Channel]()
override func viewDidLoad() {
super.viewDidLoad()
self.cv.delegate = self
self.cv.dataSource = self
let db = Firestore.firestore()
db.collection("content").getDocuments() {( quarySnapshot, err) in
if let err = err {
print("error")
} else {
for document in quarySnapshot!.documents {
if let name = document.data()["title"] as? Channel {
self.channel.append(name)
}
}
self.cv.reloadData()
}
}
}
}
extension ViewController: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return channel.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! ContentCell
let indexChannel = channel[indexPath.row]
cell.setup(channel: indexChannel)
return cell
}
}
This is my cell
class ContentCell: UICollectionViewCell {
#IBOutlet weak var channelText: UILabel!
#IBOutlet weak var subtitle: UITextView!
func setup(channel: Channel) {
channelText.text = channel.title
subtitle.text = channel.subtitle
}
}
If you need additional information - write

Answer 1

Your problem is here
if let name = document.data()["title"] as? Channel {
self.channel.append(name)
}
you can't cast a String to a Custom data type (Channel) , so according to your data you can try this
if let title = document.data()["title"] as? String , let subtitle = document.data()["subtitle"] as? String {
let res = Channel(title:title,subtitle:subtitle)
self.channel.append(res)
}