Can't get the value of a var in another class

Question

I'm trying to get the value of a String var from an another class, but when i'm using it on the new class, the value is empty. I've got the MainViewController.swift class with :

    var movieIDSelected = String()

@IBAction func tapPosterButton(_ sender: UIButton) {
    switch sender.tag
    {
    case 101: movieIDSelected = theaterMovieID[0]
    print(movieIDSelected) //The value isn't empty
        break
    }
  }

And the second MovieViewController.swift class with :

var HomeView = ViewPop()

override func viewDidLoad() {
    super.viewDidLoad()

    let movieID = HomeView.movieIDSelected
    print(movieID) //The value is empty
}

Answer 1

With your current code try this in MainVC

if let home = UIApplication.shared.keyWindow?.rootViewController as? ViewPop {
   print("home exists ",home.movieIDSelected)
}

//

but you should have only 1 segue to the destinationVC and link it to the VC not a segue for every button , then implement prepareForSegue and fire performSegue inside the button action to make the segue

//

@IBAction func tapPosterButton(_ sender: UIButton) {
    switch sender.tag
    {
       case 101: movieIDSelected = theaterMovieID[0]
        print(movieIDSelected) //The value isn't empty
        self.performSegue(withIdentifier: "goToNext", sender:1)

        break
    }
}

//

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

      let des = segue.destination as! MovieViewController

      des.sendedValue = self.movieIDSelected

      des.buttonNumber = sender as! Int

}

//

class MovieViewController : UIViewController {

     var sendedValue = ""

    var buttonNumber = 0 // default value won't affect 
}