swift: photos from firebase not showing in table view - ios

Question

I already looked at similar questions and problems and tried what they suggested but none seemed to work and i cant seem to find why nothing is showing in the view. The following is my code.
class HomeViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var postsTableView: UITableView!
var posts = NSMutableArray()
override func viewDidLoad() {
super.viewDidLoad()
postsTableView.estimatedRowHeight = 521
postsTableView.rowHeight = UITableView.automaticDimension
postsTableView.delegate = self
postsTableView.dataSource = self as UITableViewDataSource
loadData()
}
func loadData() {
Database.database().reference().child("posts").observeSingleEvent(of: .value, with: { (snapshot) in
if let postsDictionary = snapshot.value as? [String: AnyObject]{
for post in postsDictionary {
self.posts.add(post.value)
}
self.postsTableView.reloadData()
}
})
}
func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return self.posts.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! PostTableViewCell
let post = self.posts[indexPath.row] as! [String: AnyObject]
if let imageName = post["posts"] as? String {
let imageRef = Storage.storage().reference().child("posts/\(String(describing: imageName))")
imageRef.getData(maxSize: 15 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
//successful
let image = UIImage(data: data!) //create an image with data sent from database
cell.postImageView.image = image
cell.postImageView.alpha = 0
UIView.animate(withDuration: 0.4, animations: {
cell.postImageView.alpha = 1
})
} else {
//error
print("Error downloading the image: \(String(describing: error?.localizedDescription))")
}
tableView.reloadData()
})
}
return cell
}
}
The screen just shows empty cells of the table view.
This is the console when the app loads.
Also excuse me if I didnt format my question correctly.

Answer 1

As Prettygeek mentioned, first of all, check if the completion of getData is being called. If not, try to retain imageRef outside of tableView(cellForRowAt:) scope (just for debugging).
Check on which thread getData calls its completion, most likely it's different from the main thread, and you shouldn't make calls to UIKit from the thread other than main. DispatchQueue.main.async will get handy there.