我想做这个故事,用户有两个选择。现在它只工作了一半,我只是不明白为什么它不改变按钮上的选择。基本上,它可以工作,直到第二个 if
声明。
let startOfStory = [
Story(title: "You see a fork in the road", choice1: "Turn Left", choice2: "Turn Right"),
Story(title: "You see a tiger", choice1: "Shout for help", choice2: "Play Dead"),
Story(title: "You find a Treasure Chest", choice1: "Open it", choice2: "Check for Traps"),
]
var storyNumber = 0
override func viewDidLoad() {
super.viewDidLoad()
updateUI()
}
@IBAction func choiceMade(_ sender: UIButton) {
let userAnswer = sender.currentTitle
updateUI()
if userAnswer == startOfStory[0].choice1 {
storyLabel.text = startOfStory[1].title
} else if userAnswer == startOfStory[0].choice2 {
storyLabel.text = startOfStory[2].title
}
if userAnswer == startOfStory[1].choice1 {
storyLabel.text = startOfStory[0].title
} else if userAnswer == startOfStory[2].choice1 {
storyLabel.text = startOfStory[0].title
}
}
func updateUI() {
storyLabel.text = startOfStory[storyNumber].title
choice1Button.setTitle(startOfStory[storyNumber].choice1, for: .normal)
choice2Button.setTitle(startOfStory[storyNumber].choice2, for: .normal)
}
你的价值 storyNumber
被卡在了0上,因为那是它的定义,而且我看到的任何地方都没有更新。
你应该更新 storyNumber
在每次决定后,确保故事的进展,还应该给你的 updateUI()
在您的 if
职能。
@IBAction func choiceMade(_ sender: UIButton) {
let userAnswer = sender.currentTitle
if userAnswer == startOfStory[0].choice1 {
storyLabel.text = startOfStory[1].title
storyNumber = 1
} else if userAnswer == startOfStory[0].choice2 {
storyLabel.text = startOfStory[2].title
storyNumber = 2
}
if userAnswer == startOfStory[1].choice1 {
storyLabel.text = startOfStory[0].title
storyNumber = 0
} else if userAnswer == startOfStory[2].choice1 {
storyLabel.text = startOfStory[0].title
storyNumber = 0
}
updateUI()
}