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iOS

EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)

At this point in the quiz, the app is supposed to calculate the final score. At the moment, it crashes after selecting an answer on the final question, with the title error appearing on the third line:

var score = 0
for question in QuestionController.questionsList {
    score += question.selectedAnswerIndex!

Full code for that swift file

class ResultsController: UIViewController {

  let resultsLabel: UILabel = {
    let label = UILabel()
    label.text = "Congratulations! You'd make a great Ross!"
    label.contentMode = .scaleToFill
    label.numberOfLines = 0
    label.translatesAutoresizingMaskIntoConstraints = false
    label.textAlignment = .center
    label.font = UIFont.boldSystemFont(ofSize: 30)
    return label
  }()

  override func viewDidLoad() {
    super.viewDidLoad()

    navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(done(sender:)))

    navigationItem.title = "Results"

    view.backgroundColor = UIColor.white

    view.addSubview(resultsLabel)
    view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": resultsLabel]))
    view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": resultsLabel]))

    let names = ["Ross", "Joey", "Chandler", "Monica", "Rachel", "Phoebe"]

    var score = 0
    for question in QuestionController.questionsList {
      score += question.selectedAnswerIndex!
    }

    let result = names[score % names.count]
    resultsLabel.text = "Congratulations! \(result)."
  }

  @objc func done(sender: UIBarButtonItem) {

    navigationController?.popToRootViewController(animated: true)

  }

}
Rich Donnellan
Rich Donnellan
Treehouse Moderator 27,696 Points

Question updated with code formatting. Check out the Markdown Cheatsheet link below the "Add an Answer" for syntax examples.

1 Answer

Addison Francisco
Addison Francisco
9,561 Points

Emily,

Which challenge is this for?