我有一个分段控件，可以在我的一个 View Controller 上更改 5 个图像(见下图)，但我希望当有人进入 Casting 选项卡时立即选择 Segment 0。目前它只有在我进入第 1 或第 2 段然后返回时才会被选中，之后它显然可以正常工作。

在“行为”旁边的“属性检查器”中，我已经启用并选择了勾选，我什至尝试勾选状态选择但总是相同的结果所以我不确定我哪里出错了。我可以通过将代码添加到我的 ViewDidLoad 来获取 5 张图像的视觉修复，将其中四张设置为 .isHidden = true，将一张设置为 .isHidden = false，但这显然不能解决我的问题。

这是我的代码:

    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

            }
    }
}

最佳答案

以编程方式在 viewDidAppear 或 viewDidLoad 中设置段索引(取决于您的应用程序要求)

override func viewDidAppear() {
        super.viewDidAppear()

        segmentedControl.selectedSegmentIndex = 0
}

关于ios - 分段控制在分段 0 上未按预期工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44861161/