按下按钮后迅速出现 SIGABRT 错误-segue 不执行

Question

I'm trying to make a leaderboard for a word scrambler app so I am saving the data before segueing to the next view controller which will eventually be a leaderboard. My outlets are all connected and the segue identifier was written correctly so I don't see why the app crashes after done is pressed

the error line occurs here: class AppDelegate: UIResponder, UIApplicationDelegate {

var finalScore = Int()
var playerName = String()
var allMyStoredData = UserDefaults.standard
class secondVC: UIViewController {

    @IBOutlet weak var scoreLabel: UILabel!
    @IBOutlet weak var nameTF: UITextField!
    @IBOutlet weak var doneButton: UIButton!
    var playerScore = 0

    override func viewDidLoad() {
        super.viewDidLoad()
        scoreLabel.text = "Your score is: \(finalScore)"
        loadData()
    }

    @IBAction func donePressed(_ sender: Any) {
        saveData()
        //this part won't execute
        performSegue(withIdentifier: "toLeaderboard", sender: self)
    }

    func saveData () {
        playerName = nameTF.text!
        playerScore = finalScore
        allMyStoredData.set(playerName, forKey: "saveTheName")
        allMyStoredData.set(playerScore, forKey: "saveTheScore")
    }

    func loadData () {
        if let loadPlayerName:String = UserDefaults.standard.value(forKey: "saveTheName") as? String {
            playerName = loadPlayerName
        }

        if let loadTheScore:Int = UserDefaults.standard.value(forKey: "saveTheName") as? Int {
            playerScore = loadTheScore
        }
    }
}

Answer 1

更新：视图控制器中有一个出口，segue“toLeaderboard”没有连接或使用，所以我删除了它，现在代码很好