How to terminate (not segue) just one view in Swift - ios

Question

I am wondering how to make just 1 view terminate in iOS. I am making an app such that in the viewDidLoad() it generates 52 random strings and appends them to an array. I have it so that when you shake the device, it will perform a segue.
The problem with this is that it keeps the items in the array that I mentioned earlier. This means that when it does the user goes into that view again, it will still have the 52 random strings, plus when it goes through the viewDidLoad function, it will append 52 more strings, so if the user doesn't terminate the whole entire app, but just segues out of the view and goes back in, there will be 104 strings and not 52.
I don't want the above to happen in my app, so I am wondering how you could just terminate this one view while also performing a segue so that this problem won't happen.
Here is some code from my app:
These are the arrays I had:
var theCardsTopPlayerHas = [""]
var theCardsBottomPlayerHas = [""]
var theCardsThatWork = ["2_of_clubs", "2_of_diamonds", "2_of_hearts", "2_of_spades", "3_of_clubs", "3_of_diamonds", "3_of_hearts", "3_of_spades", "4_of_clubs", "4_of_diamonds", "4_of_hearts", "4_of_spades", "5_of_clubs", "5_of_diamonds", "5_of_hearts", "5_of_spades", "6_of_clubs", "6_of_diamonds", "6_of_hearts", "6_of_spades", "7_of_clubs", "7_of_diamonds", "7_of_hearts", "7_of_spades", "8_of_clubs", "8_of_diamonds", "8_of_hearts", "8_of_spades", "9_of_clubs", "9_of_diamonds", "9_of_hearts", "9_of_spades", "10_of_clubs", "10_of_diamonds", "10_of_hearts", "10_of_spades", "jack_of_clubs2", "jack_of_diamonds2", "jack_of_hearts2", "jack_of_spades2", "queen_of_clubs2", "queen_of_diamonds2", "queen_of_hearts2", "queen_of_spades2", "king_of_clubs2", "king_of_diamonds2", "king_of_hearts2", "king_of_spades2","ace_of_clubs", "ace_of_diamonds", "ace_of_hearts", "ace_of_spades"]
Here is what the viewDidLoad method has:
struct shuffledVar {
static var shuffled = [String]();
}
override func viewDidLoad() {
super.viewDidLoad()
upperLabelNumber.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
//MARK: - Shuffling Cards
for _ in 1...52 {
let shuffledCardList = Int(arc4random_uniform(UInt32(theCardsThatWork.count)))
let the_card = theCardsThatWork[shuffledCardList]
print("\(the_card)")
shuffledVar.shuffled.append(the_card)
theCardsThatWork.remove(at: shuffledCardList)
print("Finished Card")
}
theCardsTopPlayerHas = Array(shuffledVar.shuffled[0...25])
theCardsBottomPlayerHas = Array(shuffledVar.shuffled[26...51])
print("")
print(shuffledVar.shuffled)
print("")
print(theCardsTopPlayerHas)
print("")
print(theCardsBottomPlayerHas)
}
This is the code that segues the view:
override func motionBegan(_ motion: UIEventSubtype, with event: UIEvent?) {
performSegue(withIdentifier: "friendToDashboard", sender: self)
}
Thank you!

Answer 1

The problem is that you are using a static var to store your array of strings.
To solve this problem there are several solutions depending on what you need. Here there are a couple of solutions:
Solution 1
If you really need to keep the shuffled array as a Singleto, then you can empty the shuffled array in the viewDidLoad method:
override func viewDidLoad() {
super.viewDidLoad()
shuffledVar.shuffled = []
upperLabelNumber.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
...
}
Solution 2
If you do not need to keep the shuffled array as a Singleton, then you can modify it as follows:
struct shuffledVar {
var shuffled = [String]();
}
var shuffled = shuffledVar()
override func viewDidLoad() {
super.viewDidLoad()
upperLabelNumber.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
//MARK: - Shuffling Cards
for _ in 1...52 {
let shuffledCardList = Int(arc4random_uniform(UInt32(theCardsThatWork.count)))
let the_card = theCardsThatWork[shuffledCardList]
print("\(the_card)")
shuffled.shuffled.append(the_card)
theCardsThatWork.remove(at: shuffledCardList)
print("Finished Card")
}
theCardsTopPlayerHas = Array(shuffled.shuffled[0...25])
theCardsBottomPlayerHas = Array(shuffled.shuffled[26...51])
print("")
print(shuffled.shuffled)
print("")
print(theCardsTopPlayerHas)
print("")
print(theCardsBottomPlayerHas)
}

Answer 2

You are using static var shuffled so you are using static variable. Do you really need a static variable? If not instead of:
struct shuffledVar {
static var shuffled = [String]();
}
use:
var shuffled:[String] = []
and then in code use:
shuffled.append(the_card)
But if you need this variable to be static (for example you are using it in some other view controller) just remove all elements before adding a new one:
//MARK: - Shuffling Cards
shuffledVar.shuffled.removeAll()
You can read more about static vars https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/Properties.html and more about arrays: https://developer.apple.com/documentation/swift/array