IOS Updating button title and updating array with button value? - ios

Question

I am new to IOS Development and am implementing IOS QUIZ App.
How to update question and answers in QUIZ app.
Please check below my code this is how I am displaying.
#IBOutlet weak var prevBtn: UIButton!
#IBOutlet weak var nxtBtn: UIButton!
#IBOutlet weak var qstnlbl: UILabel!
#IBOutlet weak var answerABtn: UIButton!
#IBOutlet weak var answerBBtn: UIButton!
#IBOutlet weak var answerCBtn: UIButton!
#IBOutlet weak var answerDBtn: UIButton!
let questions = ["How many days are there in 1 year?", "Favorite color?", "Where was I born?"]
let answers = [["360", "365", "384", "377"], ["blue", "black", "green", "orange"], ["Tokyo", "New York", "Tennessee", "rajahmundry"]]
//Variables
var currentQuestion = 0
var rightAnswerPlacement:UInt32 = 0
var points = 0;
//Label
#IBOutlet weak var lbl: UILabel!
//Button
#IBAction func action(_ sender: AnyObject)
{
if (sender.tag == Int(rightAnswerPlacement))
{
print ("RIGHT!")
points += 1
}
else
{
print ("WRONG!!!!!!")
}
if (currentQuestion != questions.count)
{
newQuestion()
}
}
#IBAction func preAction(_ sender: AnyObject)
{
if (currentQuestion != questions.count)
{
newQuestion()
}
currentQuestion = currentQuestion - 1
}
#IBAction func nxtaction(_ sender: AnyObject)
{
if (currentQuestion != questions.count)
{
newQuestion()
}
currentQuestion = currentQuestion + 1
}
override func viewDidAppear(_ animated: Bool)
{
newQuestion()
}
//Function that displays new question
func newQuestion()
{
qstnlbl.text = questions[currentQuestion]
rightAnswerPlacement = arc4random_uniform(3)+1
//Create a button
var button:UIButton = UIButton()
var x = 1
for i in 1...4
{
//Create a button
button = view.viewWithTag(i) as! UIButton
button.setTitle(answers[currentQuestion][x], for: .normal)
x = 2
}
currentQuestion += 1
}
based on user selection answers has be to added to answerArray.
For Ex: if user selects in first question in answerABtn answer option "A " answerArray has to update with "A" value.
user can able to update answer
for Ex: user select 1st question answer option "b" answerArray has to update with "b" value.
please help me out to make this quiz app.
quiz app ui
enter image description here

Answer 1

There are quite a few things you should be doing differently, but to get you on your way...
You will want to create a answerArray variable to hold the user-selected answers. Inside your action func, you are already tracking which button was tapped, so append the button's title to your answer array at the same point.
Your current previous and next actions don't make any sense, because you are not tracking the question count correctly, and you are picking a random "correct" answer each time.
Here is your code, modified for:
better question count incrementing
tracking user selected answers in answerArray
clearing the screen when the quiz is complete
Note: this is just example code... this should not be considered "everything fixed" -- but it should help you with this step. Review the comments I've added to your code.
class QuizViewController: UIViewController {
#IBOutlet weak var prevBtn: UIButton!
#IBOutlet weak var nxtBtn: UIButton!
#IBOutlet weak var qstnlbl: UILabel!
#IBOutlet weak var answerABtn: UIButton!
#IBOutlet weak var answerBBtn: UIButton!
#IBOutlet weak var answerCBtn: UIButton!
#IBOutlet weak var answerDBtn: UIButton!
let questions = ["How many days are there in 1 year?", "Favorite color?", "Where was I born?"]
let answers = [["360", "365", "384", "377"], ["blue", "black", "green", "orange"], ["Tokyo", "New York", "Tennessee", "rajahmundry"]]
//Variables
var currentQuestion = 0
var rightAnswerPlacement:UInt32 = 0
var points = 0;
// array to hold answers
var answerArray: [String] = [String]()
//Label
#IBOutlet weak var lbl: UILabel!
//Button
#IBAction func action(_ sender: AnyObject)
{
// make sure this came from a button, and get the button title
guard let btn = sender as? UIButton,
let btnTitle = btn.currentTitle else { return }
if (btn.tag == Int(rightAnswerPlacement))
{
print ("RIGHT!")
points += 1
}
else
{
print ("WRONG!!!!!!")
}
// append the selected answer to the answerArray
answerArray.append(btnTitle)
// increment question counter
currentQuestion += 1
// if there are more questions
if (currentQuestion < questions.count)
{
newQuestion()
}
else
{
quizComplete()
}
}
func quizComplete() -> Void {
[answerABtn, answerBBtn, answerCBtn, answerDBtn].forEach {
$0?.isHidden = true
}
qstnlbl.text = "Your score: \(points)"
}
// these two funcs do not make any sense as written
/*
#IBAction func preAction(_ sender: AnyObject)
{
if (currentQuestion != questions.count)
{
newQuestion()
}
currentQuestion = currentQuestion - 1
}
#IBAction func nxtaction(_ sender: AnyObject)
{
if (currentQuestion != questions.count)
{
newQuestion()
}
currentQuestion = currentQuestion + 1
}
*/
override func viewDidAppear(_ animated: Bool)
{
newQuestion()
}
//Function that displays new question
func newQuestion()
{
qstnlbl.text = questions[currentQuestion]
rightAnswerPlacement = arc4random_uniform(3)+1
for i in 1...4
{
// get a reference to a button
let button = view.viewWithTag(i) as! UIButton
button.setTitle(answers[currentQuestion][i-1], for: .normal)
}
// don't increment question count here
// increment it AFTER user answers the question (in button tap action)
//currentQuestion += 1
}
}

Answer 2

here you go:
import UIKit
class ViewController: UIViewController {
var emptyArray : [String] = []
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = .red
}
#objc func buttonAction(sender: UIButton!) {
emptyArray.append("A")
print(emptyArray)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let button = UIButton()
button.frame = CGRect(x: self.view.frame.size.width - 300, y: 200, width: 100, height: 100)
button.backgroundColor = UIColor.blue
button.setTitle("Name your Button ", for: .normal)
button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
self.view.addSubview(button)
}
}
when you press the buttom over and over, the output to debug window is this
["A"]
["A", "A"]
["A", "A", "A"]
["A", "A", "A", "A"]