Incrementing Array Element By One In Swift - ios

Question

I am Currently working on a swift project in XCode, and I've encountered an issue where I cannot increment an array's one element by through various endeavours.
My ViewController.Swift
import UIKit
class FailureViewController: UIViewController {
#IBOutlet weak var failFactLabel: UILabel!
let failFact = Failure()
override func viewDidLoad() {
super.viewDidLoad()
failFactLabel.text = failFact.failArray[0]
}
#IBAction func showFunFact() {
//this is where the issue is
}
}
For the function showFunFact I have previously tried
for var x = 0; x < failArray.cout; x++ {
failFactLabel.text = failFact.failArray[x]
}
but encountered the error: "Use of Unresolved Identifier".
Putting this aside, I decided to use
for var x = 0; x < 10; {
x+=1
}
Although this does not generate an error however, I see it stops at the first element in my array. I tried +=5 and it displays the 5th element in my array once, I believe this code runs through once. I need it to be a consistently working piece so it continuously displays the next element, I am stumped because this should theoretically work since it is called a "Loop" Any help or suggestion is Appreciated!
Objective Redefined:
I am trying to show one fact at a time, before this I have used a random function to generate a random fact every time however things tend to get repetitive and therefore I decided to start on the initial array index is 0 and grab the next fact (next element in array) every time the button is pressed (Thanks to Luk's Question)

Answer 1

You need to create an instance variable to hold the current factIndex, if that is what you actually are trying:
import UIKit
class FailureViewController: UIViewController {
#IBOutlet weak var failFactLabel: UILabel!
var factIndex = 0
let failFact = Failure()
override func viewDidLoad() {
super.viewDidLoad()
failFactLabel.text = failFact.failArray[factIndex]
}
#IBAction func showFunFact() {
factIndex++
if factIndex >= failFact.failArray.count then {
factIndex = 0
}
failFactLabel.text = failFact.failArray[factIndex]
}
}