Text on UIButton not updating SWIFT - swift

Question

I am making an app in Swift on which all elements are added programatically.
//This code is inside of viewDidLoad function
makeButtonWithName(button: answer0B, title: "0", font:
"HelveticaNeue", fontSize: resetHeight, frame: CGRect(x:width/2 -
viewWidth/2, y: firstViewY, width: viewWidth, height: viewHeight),
selector: #selector(self.answer0(_:)))
makeButtonWithName(button: answer1B, title: "0", font: "HelveticaNeue",
fontSize: resetHeight, frame: CGRect(x:width/2 - viewWidth/2, y:
secondViewY, width: viewWidth, height: viewHeight), selector:
#selector(self.answer1(_:)))
makeButtonWithName(button: answer2B, title: "0", font:
"HelveticaNeue", fontSize: resetHeight, frame: CGRect(x:width/2 -
viewWidth/2, y: thirdViewY, width: viewWidth, height: viewHeight),
selector: #selector(self.answer2(_:)))
makeButtonWithName(button: answer3B, title: "0", font:
"HelveticaNeue", fontSize: resetHeight, frame: CGRect(x:width/2 -
viewWidth/2, y: fourthViewY, width: viewWidth, height: viewHeight),
selector: #selector(self.answer3(_:)))
firstNumber = Int(arc4random_uniform(9))
secondNumber = Int(arc4random_uniform(9))
incorrectAnswer1 = Int(arc4random_uniform(18))
incorrectAnswer2 = Int(arc4random_uniform(18))
incorrectAnswer3 = Int(arc4random_uniform(18))
timer.invalidate()
seconds = 31
runTimer()
randomNumbers()
//End viewDidLoad function
func answer0(_ sender: UIButton!){
let a:Int? = Int((answer0B.titleLabel?.text)!)
if a == answerNumber{
correctIncorrectLabel.text = "Correct"
correctIncorrectLabel.textColor = UIColor.green
correctNumber += 1
}
else{
correctIncorrectLabel.text = "Incorrect"
correctIncorrectLabel.textColor = UIColor.red
}
randomNumbers()
}
func answer1(_ sender: UIButton!){
let b:Int? = Int((answer1B.titleLabel?.text)!)
if b == answerNumber{
correctIncorrectLabel.text = "Correct"
correctIncorrectLabel.textColor = UIColor.green
correctNumber += 1
}
else{
correctIncorrectLabel.text = "Incorrect"
correctIncorrectLabel.textColor = UIColor.red
}
randomNumbers()
}
func answer2(_ sender: UIButton!){
let c:Int? = Int((answer2B.titleLabel?.text)!)
if c == answerNumber{
correctIncorrectLabel.text = "Correct"
correctIncorrectLabel.textColor = UIColor.green
correctNumber += 1
}
else{
correctIncorrectLabel.text = "Incorrect"
correctIncorrectLabel.textColor = UIColor.red
}
randomNumbers()
}
func answer3(_ sender: UIButton!){
let d:Int? = Int((answer3B.titleLabel?.text)!)
if d == answerNumber{
correctIncorrectLabel.text = "Correct"
correctIncorrectLabel.textColor = UIColor.green
correctNumber += 1
}
else{
correctIncorrectLabel.text = "Incorrect"
correctIncorrectLabel.textColor = UIColor.red
}
randomNumbers()
printProblem()
}
func randomNumbers(){
firstNumber = Int(arc4random_uniform(9))
secondNumber = Int(arc4random_uniform(9))
answerNumber = firstNumber + secondNumber
printProblem()
randomButton = Int(arc4random_uniform(4))
incorrectAnswer1 = Int(arc4random_uniform(18))
incorrectAnswer2 = Int(arc4random_uniform(18))
incorrectAnswer3 = Int(arc4random_uniform(18))
showTextOnButton()
totalCorrect.text = "Total Correct: \(correctNumber)"
}
func showTextOnButton(){
if randomButton == 0 {
answer0B.setTitle("\(answerNumber)", for: .normal)
answer1B.setTitle("\(incorrectAnswer1)", for: .normal)
answer2B.setTitle("\(incorrectAnswer2)", for: .normal)
answer3B.setTitle("\(incorrectAnswer3)", for: .normal)
}
if randomButton == 1 {
answer1B.setTitle("\(answerNumber)", for: .normal)
answer0B.setTitle("\(incorrectAnswer1)", for: .normal)
answer2B.setTitle("\(incorrectAnswer2)", for: .normal)
answer3B.setTitle("\(incorrectAnswer3)", for: .normal)
}
if randomButton == 2 {
answer1B.setTitle("\(answerNumber)", for: .normal)
answer2B.setTitle("\(incorrectAnswer1)", for: .normal)
answer0B.setTitle("\(incorrectAnswer2)", for: .normal)
answer3B.setTitle("\(incorrectAnswer3)", for: .normal)
}
if randomButton == 3 {
answer1B.setTitle("\(answerNumber)", for: .normal)
answer2B.setTitle("\(incorrectAnswer1)", for: .normal)
answer3B.setTitle("\(incorrectAnswer2)", for: .normal)
answer0B.setTitle("\(incorrectAnswer3)", for: .normal)
}
}
func printProblem(){
questionLabel.text = "\(firstNumber) + \(secondNumber)"
}
func makeButtonWithName(button: UIButton,title: String, font: String, fontSize: Int, frame: CGRect, selector: Selector) {
let button = UIButton(type: UIButtonType.custom)
button.setTitle(title, for: .normal)
button.frame = frame
button.setTitleColor(UIColor.white, for: .normal)
button.titleLabel?.font = UIFont(name: font, size: CGFloat(fontSize))
button.addTarget(self, action: selector, for: .touchUpInside)
self.view.addSubview(button)
}
These 4 buttons have text. When you click each of these, text on the buttons is not changing. The functions are using set title to update the text on the buttons, but for every run of the app the buttons do their function but the text on them remains at 0.

Answer 1

Okay... so many codes. So basically, to change the button.text, use
button.setTitle("new text", for: .normal)
Also, when user clicks on the button,first thing you maybe want to disable it by:
button.isEnable = false
Then after click action, enable it again
button.isEnable = true
This is because it may cause unexpected error when user intentionally/unintentionally multi click on that button.