Not Repeating Words in Swift when clicking button - IOS - ios

Question

How can I not repeat the array when I click on the button in swift? I'm trying to generate fruits without them repeating. Can I sort the string that way it runs through all the fruits one by one? It doesn't have to be randomized. I just want each word to show only once when I click the button and show the last array "There aren't any fruit options left"
I tried to randomize the string but that repeats the fruits. I just want it to go one by one. When I press the button on my screen the output on the image label should give me each fruit one at a time.
ie. Button pressed"
Output: "Apple"
button pressed again
Output: "Banana"
and so on until the last string shows "There aren't any fruit options left"
import UIKit
class fruitrandomViewController: UIViewController {
#IBOutlet weak var nextfruitButton: UIButton!
#IBOutlet weak var fruitbox: UILabel!
#IBAction func fruitbutton(_ sender: UIButton) {
let array = ["Apple","Banana","Orange","Pinapple", "Plum", "Pear","T"There aren't any fruit options left",]
let randomFruitgenerator = Int(arc4random_uniform(UInt32(array.count)))
fruitbox.text = array[randomFruitgenerator]
}
}

Answer 1

You need to somehow keep track of the array elements that you have already used. You could do this in a couple of ways:
Keep an index property that tracks the next element of the array
Mutate the array itself as elements are consumed
Either way, you should make the array an instance property, not a local variable in the function itself.
Here is an example of the second approach (I prefer this since I think it makes the code a little simpler, as you don't need to track the next index).
class fruitrandomViewController: UIViewController {
#IBOutlet weak var nextfruitButton: UIButton!
#IBOutlet weak var fruitbox: UILabel!
var fruit = ["Apple","Banana","Orange","Pinapple", "Plum", "Pear",].shuffled()
#IBAction func fruitbutton(_ sender: UIButton) {
if fruit.isEmpty {
fruitbox.text = "There's no more fruit left"
} else {
fruitbox.text = self.fruit[0]
self.fruit.remove(at:0)
}
}
}
For completeness, here is the first approach (with an added "previous fruit" button):
class fruitrandomViewController: UIViewController {
#IBOutlet weak var nextfruitButton: UIButton!
#IBOutlet weak var fruitbox: UILabel!
let fruit = ["Apple","Banana","Orange","Pinapple", "Plum", "Pear",].shuffled()
var nextFruit = 0
#IBAction func fruitbutton(_ sender: UIButton) {
if nextFruit < fruit.count {
fruitbox.text = self.fruit[nextFruit]
nextFruit += 1
} else {
fruitbox.text = "There's no more fruit left"
}
}
#IBAction func previousFruitButton(_ sender: UIButton) {
guard nextFruit > 0 else {
return
}
nextFruit -= 1
fruitbox.text = self.fruit[nextFruit]
}
}
If you don't want the fruit in a random order, just remove the .shuffled()