I get array index out of range - swift

Question

when I output the test result in my application, I get
fatal error: array index out of range
In the code I marked the place where the error occurred. What could be the cause of the error?
import UIKit
import RealmSwift
class ResultVC: UIViewController, UITableViewDelegate, UITableViewDataSource {
var message = ""
var result = 0
var testedVerbs = [Verb]()
var repeatTestedVerbs = [Verb]()
#IBOutlet weak var resultLabel:UILabel!
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var repeatVerbs: UILabel!
#IBOutlet weak var nextButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
tableView.reloadData()
setUp()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return testedVerbs.isEmpty ? 0 : testedVerbs.count
}
private func setUp() {
nextButton.setUpButton(button: nextButton, color: white, tintColor: black, cornerRadius: 12)
for verb in testedVerbs {
if verb.progress <= 0.49 {
repeatTestedVerbs.append(verb)
}
}
if repeatTestedVerbs.count <= 3 {//testedVerbs.count/20 * 100 {
view.backgroundColor = orange
message = "You Can Do Better!"
} else {
view.backgroundColor = green
message = "Good Job!"
}
resultLabel.text = "\(message) \(result) / \(testedVerbs.count)"
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
tableView.backgroundColor = .clear
let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as! ResultCell
// MARK: Index out of range
let verb = repeatTestedVerbs[indexPath.row]
cell.infinitiv.text = verb.infinitiv
cell.translate.text = verb.translate
cell.level.text = verb.level
cell.backgroundColor = .clear
return cell
}
static func storyboardInstance() -> ResultVC? {
let storyboard = UIStoryboard(name: String(describing: self), bundle: nil)
return storyboard.instantiateInitialViewController() as? ResultVC
}
#IBAction func repeatButton(_ sender: UIButton) {
if let nvc = navigationController {
nvc.popViewController(animated: true)
}
}
#IBAction func cancel(_ sender:UIButton) {
if let nvc = navigationController {
for vc in nvc.viewControllers {
if vc is ThemeTVC {
navigationController?.popToViewController(vc, animated: true)
break
}
}
}
}
}

Answer 1

Your numberOfRows is based on testedVerbs, but your cellForRowAt reads from repeatTestedVerbs.