Swift 4 - Quiz App Random Questions - ios

Question

I'm a beginner to Swift and generally Xcode. Thank you in advance for your time and help :)
I am doing a Quiz App, and I try to have random questions... I have a function to generate random numbers that I tried to apply in viewDidLoad()... unfortunately I can not guess how to use that information in his variable "var currentQuestion = 0"
This is the code:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
generateRandomNumber(0, 9, 10)
}
override func viewDidAppear(_ animated: Bool) {
newQuestion()
}
// Quiz//
let questions = ["Q1","Q2","Q3","Q4","Q5"]
let answers = [["A","2","3"],["B","2","3"],["C","2","3"],["D","2","3"],["E","2","3"]]
//Variables
var currentQuestion = 0
var rightAnswerPlacement:UInt32 = 0
//Generate Random Numbers
func generateRandomNumber(_ from:Int, _ to:Int, _ qut:Int?) -> [Int] {
var myRandomNumbers = [Int]() //All our generated numbers
var numberOfNumbers = qut //How many numbers to generate
let lower = UInt32(from) //Generate from this number..
let higher = UInt32(to+1) //To this one
if numberOfNumbers == nil || numberOfNumbers! > (to-from) + 1 {
numberOfNumbers = (to-from) + 1
}
while myRandomNumbers.count != numberOfNumbers {
let myNumber = arc4random_uniform(higher - lower) + lower
if !myRandomNumbers.contains(Int(myNumber)) {
myRandomNumbers.append(Int(myNumber))
}
}
return myRandomNumbers
}
//Label
#IBOutlet weak var lbl: UILabel!
//Button
#IBAction func action(_ sender: AnyObject) {
if (sender.tag == Int(rightAnswerPlacement)) {
print ("RIGHT!")
} else {
print ("WRONG!!!!!!")
}
if (currentQuestion != questions.count) {
newQuestion()
} else {
}
}
//Function that displays new question
func newQuestion() {
lbl.text = questions[currentQuestion]
rightAnswerPlacement = arc4random_uniform(3)+1
//Create a button
var button:UIButton = UIButton()
var x = 1
for i in 1...3 {
//Create a button
button = view.viewWithTag(i) as! UIButton
if (i == Int(rightAnswerPlacement)) {
button.setTitle(answers[currentQuestion][0], for: .normal)
} else {
button.setTitle(answers[currentQuestion][x], for: .normal)
x = 2
}
}
currentQuestion += 1
}
Any idea that how will be possible to resolve?

Answer 1

First you need to store the array of random questions that you generate (side note you appear to try to generate 10 random numbers but have only 5 questions).
Then instead of using the currentQuestion directly you use that to access the question in the array.
So change it to this:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
questionArray = generateRandomNumber(0, 9, 10)
}
override func viewDidAppear(_ animated: Bool) {
newQuestion()
}
// Quiz//
let questions = ["Q1","Q2","Q3","Q4","Q5"]
let answers = [["A","2","3"],["B","2","3"],["C","2","3"],["D","2","3"],["E","2","3"]]
//Variables
var currentQuestion = 0
var rightAnswerPlacement:UInt32 = 0
var questionArray: [Int] = [] // Just an initial value
//Generate Random Numbers
func generateRandomNumber(_ from:Int, _ to:Int, _ qut:Int?) -> [Int] {
var myRandomNumbers = [Int]() //All our generated numbers
var numberOfNumbers = qut //How many numbers to generate
let lower = UInt32(from) //Generate from this number..
let higher = UInt32(to+1) //To this one
if numberOfNumbers == nil || numberOfNumbers! > (to-from) + 1 {
numberOfNumbers = (to-from) + 1
}
while myRandomNumbers.count != numberOfNumbers {
let myNumber = arc4random_uniform(higher - lower) + lower
if !myRandomNumbers.contains(Int(myNumber)) {
myRandomNumbers.append(Int(myNumber))
}
}
return myRandomNumbers
}
//Label
#IBOutlet weak var lbl: UILabel!
//Button
#IBAction func action(_ sender: AnyObject) {
if (sender.tag == Int(rightAnswerPlacement)) {
print ("RIGHT!")
} else {
print ("WRONG!!!!!!")
}
if (currentQuestion != questions.count) {
newQuestion()
} else {
}
}
//Function that displays new question
func newQuestion() {
lbl.text = questions[questionArray[currentQuestion]]
rightAnswerPlacement = arc4random_uniform(3)+1
//Create a button
var button:UIButton = UIButton()
var x = 1
for i in 1...3 {
//Create a button
button = view.viewWithTag(i) as! UIButton
if (i == Int(rightAnswerPlacement)) {
button.setTitle(answers[questionArray[currentQuestion]][0], for: .normal)
} else {
button.setTitle(answers[questionArray[currentQuestion]][x], for: .normal)
x = 2
}
}
currentQuestion += 1
}
(I think the code is correct but I'm currently running some tests in Xcode so can't check. If there is a problem leave a comment.)