Array.append is overwriting not appending - ios

Question

I have two view controllers, one contains a table view with two sections where I display a list of movies, and another view controller where I can add movies. Assume the view controller that contains the table view is VC1 and the add movie is VC2.
The problem is when I add a movie in VC2 and append it to the list of movies in VC1, it just replaces the previously added movie.
I only add the movies locally during runtime. So whenever I run the app the list initially contains 0 movies. So I add a movies and then append it to the list. When I try to add another movie, it replaces the one before it as if the list cannot contain more than one item.
This is where I append the array:
#IBAction func addMovieButtonClicked(_ sender: UIButton) {
if imageView.image == nil || movieTitleField.text == "" || movieDateField.text == "" || movieOverviewField.text == "" {
displayAlert(title: "Warning", message: "Please enter all data to be able to add your movie!")
} else {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "ViewController") as! ViewController
let movie = Movie(title: movieTitleField.text!, overview: movieOverviewField.text!, date: movieDateField.text!)
vc.customMovies.append(movie)
vc.customImages.append(imageView)
self.navigationController?.pushViewController(vc, animated: true)
}
}
but when I move back to VC1 I find the data is replaced and not appended. Any solutions?
Edit:
The first view controller that contains the tableView that I show the data is called ViewController. The second one where I add a movie is called AddMovie.
This is how I navigate to the AddMovie:
#IBAction func addMovieButton(_ sender: UIBarButtonItem) {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "AddMovie") as! AddMovie
self.navigationController?.pushViewController(vc, animated: true)
}

Answer 1

You are creating new instence every time ...
self.storyboard?.instantiateViewController(withIdentifier: "ViewController") as! ViewController
You need to get the current and then append. To append movies you can use delegates as well as Closures
To use Delegate
protocol AddMoviesToController:AnyObject {
func addMoviesToController(movie:Movie , image:UIImage)
}
class AddMovie:UIViewController {
weak var delegate:AddMoviesToController?
#IBAction func addMovieButtonClicked(_ sender: UIButton) {
if imageView.image == nil || movieTitleField.text == "" || movieDateField.text == "" || movieOverviewField.text == "" {
displayAlert(title: "Warning", message: "Please enter all data to be able to add your movie!")
} else {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "ViewController") as! ViewController
let movie = Movie(title: movieTitleField.text!, overview: movieOverviewField.text!, date: movieDateField.text!)
delegate?.addMoviesToController(movie: movie, image: imageView)
self.navigationController?.pushViewController(vc, animated: true)
}
}
}
write extension like this to viewController
extension ViewController: AddMoviesToController {
func addMoviesToController(movie:Movie , image:UIImageView) {
//add movies here
customMovies.append(movie)
customImages.append(image)
tableView.reloadData()
}
}
And while pushing your controller
class ViewController: UIViewController {
#IBAction func addMovieButton(_ sender: UIBarButtonItem) {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "AddMovie") as! AddMovie
vc.delegate = self
self.navigationController?.pushViewController(vc, animated: true)
}
}