Trying to call a function in my code, not working - swift

Question

So I have created a function called startover1() and I am trying to call it in a different function, however, Xcode keeps saying there is an error.
I tried putting the function in different places, but it seems as though the function is not being read.
import Foundation
import UIKit
class BU: UIViewController {
let allBUSentences = BUSentenceBank()
var sentenceNumber2 : Int = 0
#IBOutlet weak var BUSentenceLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
let BUfirstQuestion = allBUSentences.list2[sentenceNumber2]
BUSentenceLabel.text = BUfirstQuestion.BUSentenceText
}
#IBOutlet var BUNextButton: UIButton!
#IBAction func BUNext2(_ sender: Any) {
sentenceNumber2 = sentenceNumber2 + 1
nextSentence()
}
func nextSentence() {
if sentenceNumber2 <= 19 {
BUSentenceLabel.text = allBUSentences.list2[sentenceNumber2].BUSentenceText
}
else{
let alert2 = UIAlertController(title: "Game Over", message: "Restart and keep drinking?", preferredStyle: .alert)
let restartAction2 = UIAlertAction(title: "Restart", style: .default) { (UIAlertAction) in self.startover1()
}
alert2.addAction(restartAction2)
present(alert2, animated: true, completion: nil)
}
func startover1() {
sentenceNumber2 = 0
nextSentence()
}
}
}
Hopefully it will recognize the method. The error is Value of type 'BU' has no member 'startover1'

Answer 1

The problem is that nextSentence is nested inside another func declaration. To make it work simply remove the declaration to outside of the previous function scope defined by the {brackets}. Check out:
import Foundation
import UIKit
class BU: UIViewController {
let allBUSentences = BUSentenceBank()
var sentenceNumber2 : Int = 0
#IBOutlet weak var BUSentenceLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
let BUfirstQuestion = allBUSentences.list2[sentenceNumber2]
BUSentenceLabel.text = BUfirstQuestion.BUSentenceText
}
#IBOutlet var BUNextButton: UIButton!
#IBAction func BUNext2(_ sender: Any) {
sentenceNumber2 = sentenceNumber2 + 1
nextSentence()
}
func nextSentence() {
if sentenceNumber2 <= 19 {
BUSentenceLabel.text = allBUSentences.list2[sentenceNumber2].BUSentenceText
}
else{
let alert2 = UIAlertController(title: "Game Over", message: "Restart and keep drinking?", preferredStyle: .alert)
let restartAction2 = UIAlertAction(title: "Restart", style: .default) { (UIAlertAction) in self.startover1()
}
alert2.addAction(restartAction2)
present(alert2, animated: true, completion: nil)
}
startover1() //This is not a declaration, but a call
}
//This is startover1 declaration
func startover1() {
sentenceNumber2 = 0
nextSentence()
}
}