Segmented Control not working as expected on Segment 0

Question

I have a segmented control that alters 5 images on one of my View Controllers (see image below) but I want Segment 0 to be selected straight away when someone goes into the Casting Tab. At present it only gets selected when i go onto either Segment 1 or 2 and then back, after that it obviously works as it should.

In the Attributes Inspector beside Behavior I have Enabled and Selected ticked, I have even tried State Selected ticked but always the same result so I'm unsure where I'm going wrong. I can get a visual fix by adding code to my ViewDidLoad for the 5 images, setting four of them to .isHidden = true and one to .isHidden = false but this doesn't solve my problem obviously.

Here is my code:

    import UIKit

        class CastingViewController: UIViewController {

            let runesArray = [Rune(runeName: "Fehu", runeImage: UIImage(named: ("Fehu.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Uruz", runeImage: UIImage(named: ("Uruz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Thurisaz", runeImage: UIImage(named: ("Thurisaz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Ansuz", runeImage: UIImage(named: ("Ansuz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Raidho", runeImage: UIImage(named: ("Raidho.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Kenaz", runeImage: UIImage(named: ("Kenaz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Gebo", runeImage: UIImage(named: ("Gebo.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Wunjo", runeImage: UIImage(named: ("Wunjo.png"))!, runeDescription: "Description goes here."),

                              Rune(runeName: "Hagalaz", runeImage: UIImage(named: ("Hagalaz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Nauthiz", runeImage: UIImage(named: ("Nauthiz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Isa", runeImage: UIImage(named: ("Isa.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Jera", runeImage: UIImage(named: ("Jera.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Eihwaz", runeImage: UIImage(named: ("Eihwaz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Perthro", runeImage: UIImage(named: ("Perthro.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Algiz", runeImage: UIImage(named: ("Algiz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Sowilo", runeImage: UIImage(named: ("Sowilo.png"))!, runeDescription: "Description goes here."),

                              Rune(runeName: "Tiwaz", runeImage: UIImage(named: ("Tiwaz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Berkano", runeImage: UIImage(named: ("Berkano.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Ehwaz", runeImage: UIImage(named: ("Ehwaz.png"))!, runeDescription: "(Description goes here."),
                              Rune(runeName: "Mannaz", runeImage: UIImage(named: ("Mannaz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Laguz", runeImage: UIImage(named: ("Laguz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Ingwaz", runeImage: UIImage(named: ("Ingwaz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Dagaz", runeImage: UIImage(named: ("Dagaz.png"))!, runeDescription: "Description goes here."),
                              Rune(runeName: "Othala", runeImage: UIImage(named: ("Othala.png"))!, runeDescription: "Description goes here.")]

            var runesCastArray: [UIImage] = [] // Array to save Rune images for 3 or 5 Rune Cast

    @IBOutlet weak var segmentedControl: UISegmentedControl!
    @IBOutlet weak var runeOne: UIImageView!
    @IBOutlet weak var runeTwo: UIImageView!
    @IBOutlet weak var runeThree: UIImageView!
    @IBOutlet weak var runeFour: UIImageView!
    @IBOutlet weak var runeFive: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

    }

    override func viewWillAppear(_ animated: Bool) {
        segmentedControl.selectedSegmentIndex = 0
    }

    var runeCast = 0 // Need to check if this will work in a Switch statement

    var storedRuneOne: UIImage!
    var storedRuneTwo: UIImage!
    var storedRuneThree: UIImage!
    var storedRuneFour: UIImage!
    var storedRuneFive: UIImage!

    func oneRuneCast() {

        runeCast = 1
        runeOne.isHidden = true
        runeTwo.isHidden = true
        runeThree.isHidden = true
        runeFour.isHidden = true
        runeFive.isHidden = false

    }

    func threeRuneCast() {

        runeCast = 3
        runeOne.isHidden = true
        runeTwo.isHidden = false
        runeThree.isHidden = true
        runeFour.isHidden = false
        runeFive.isHidden = false

    }

    func fiveRuneCast() {

        runeCast = 5
        runeOne.isHidden = false
        runeTwo.isHidden = false
        runeThree.isHidden = false
        runeFour.isHidden = false
        runeFive.isHidden = false

    }

    @IBAction func castType(_ sender: Any) {

       switch segmentedControl.selectedSegmentIndex {
        case 0:
            oneRuneCast()
        case 1:
            threeRuneCast()
        case 2:
            fiveRuneCast()
        default: break
        }

    }

    @IBAction func castButtonPressed(_ sender: Any) {

        if runeCast == 1 {

        let randomRunes = runesArray[Int(arc4random_uniform(UInt32(runesArray.count)))]

            runeFive.image = randomRunes.runeImage


        } else if runeCast == 3 {

            let randomRunes = runesArray[Int(arc4random_uniform(UInt32(runesArray.count)))]

            runeTwo.image = randomRunes.runeImage
            runeFour.image = randomRunes.runeImage
            runeFive.image = randomRunes.runeImage

        } else if runeCast == 5 {

            let randomRunes = runesArray[Int(arc4random_uniform(UInt32(runesArray.count)))]

            runeOne.image = randomRunes.runeImage
            runeTwo.image = randomRunes.runeImage
            runeThree.image = randomRunes.runeImage
            runeFour.image = randomRunes.runeImage
            runeFive.image = randomRunes.runeImage

            }
    }
}

Answer 1

Programmatically set the segment index in the viewDidAppear or viewDidLoad (upto your application requirements)

override func viewDidAppear() {
        super.viewDidAppear()

        segmentedControl.selectedSegmentIndex = 0
}