如何調用結構內的屬性？ Swift

Question

當用戶按下choice1按鈕時如何將choice1Destination作為Int返回，或者當用戶按下choice2按鈕時如何返回choice2Destination？

class ViewController: UIViewController {
    
    @IBOutlet weak var storyLabel: UILabel!
    @IBOutlet weak var choice1Button: UIButton!
    @IBOutlet weak var choice2Button: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        updateUI()
    }
    
    let story = [
    Story(title: "Your car has blown a tire on a winding road in the middle of nowhere with no cell phone reception. You decide to hitchhike. A rusty pickup truck rumbles to a stop next to you. A man with a wide brimmed hat with soulless eyes opens the passenger door for you and asks: 'Need a ride, boy?'.",choice1: "I'll hop in. Thanks for the help!",
          choice1Destination: 2,choice2: "Better ask him if he's a murderer first.",
          choice2Destination: 1),
    
    Story(title: "He nods slowly, unfazed by the question.",
          choice1: "At least he's honest. I'll climb in.", choice1Destination: 2,
          choice2: "Wait, I know how to change a tire.", choice2Destination: 3),
    
    Story(title: "As you begin to drive, the stranger starts talking about his relationship with his mother. He gets angrier and angrier by the minute. He asks you to open the glovebox. Inside you find a bloody knife, two severed fingers, and a cassette tape of Elton John. He reaches for the glove box.",choice1: "I love Elton John! Hand him the cassette tape.", choice1Destination: 5,choice2: "It's him or me! You take the knife and stab him.", choice2Destination: 4),
    
    Story(title: "What? Such a cop out! Did you know traffic accidents are the second leading cause of accidental death for most adult age groups?",choice1: "The", choice1Destination: 0,choice2: "End", choice2Destination: 0),
    
    Story(title: "As you smash through the guardrail and careen towards the jagged rocks below you reflect on the dubious wisdom of stabbing someone while they are driving a car you are in.",choice1: "The", choice1Destination: 0,choice2: "End", choice2Destination: 0),
    
    Story(title: "You bond with the murderer while crooning verses of 'Can you feel the love tonight'. He drops you off at the next town. Before you go he asks you if you know any good places to dump bodies. You reply: 'Try the pier.'",choice1: "The", choice1Destination: 0,choice2: "End", choice2Destination: 0)
    ]

    
    @IBAction func pressButton(_ sender: UIButton) {
        let userChoice = sender.currentTitle!
        if userChoice == "choice1Button"{
            return //How to return choice1Destination as an Int when user press the choice1 button or return choice2Destination when user press the choice2 button? //
        }

Answer 1

不要檢查標題，而是檢查 var：

if sender == choice1Button {
} 
else { //it's choice2Button
}

更進一步：

func updateStory(with story: Story) {
    self.currentStory = story 
    storyLabel.text = story.title
    choice1Button.setTitle(story.choice1, for: .normal)
    choice2Button.setTitle(story.choice2, for: .normal)
}

然后，我們將let story = [Story(...), Story(...)]重命名為我認為更有意義的stories 。 在 viewDidLoad() 中，你會調用updateStory(stories[0])

if sender == choice1Button {
    let nextStory = stories[currentStory.choice1Destination]
    updateStory(with nextStory)
} 
else { //it's choice2Button
    let nextStory = stories[currentStory.choice2Destination]
    updateStory(with nextStory)
}