ios - 带有准确答案字段的琐事(快速)

Question

我正在尝试设置带有文本字段的问题以供回答。只有在输入准确答案后才能显示下一个问题。我收到错误代码“if answerField == answers[currentQuestionIndex]”我相信我需要考虑可以输入的答案。我被卡住了，可以在正确的方向上使用一些帮助。谢谢

@IBAction func answerField(sender: AnyObject) {
    for index in 1...5 {

        if answerField == answers[currentQuestionIndex] {
            ++self.currentQuestionIndex
            if self.currentQuestionIndex == self.questions.count {
                self.currentQuestionIndex = 0
            }
        }

    }
}


let questions: [String] = ["From what is cognac made?", "What is 7+7?", "What is the capital of Vermont?"]
let answers: [String] = ["Grapes", "14", "Montpelier"]

override func viewDidLoad() {
    super.viewDidLoad()
    currentQuestion.text = questions[currentQuestionIndex]

}

Answer 1

answerField 正如您在此处显示的那样，它不是 UITextField；这是一个功能。这就是错误告诉您的内容:将 AnyObject 作为参数并且不返回任何内容的函数 ((AnyObject)->()) 无法与字符串。

我想也许您想做的是为您的答案字段创建一个导出(而不是一个 Action ):

@IBOutlet weak var answerField: UITextField! // Make sure you actually hook this up to your text field in the storyboard.

然后，监听文本字段内容的变化:

override func viewDidLoad()
{
    super.viewDidLoad()

    answerField.addTarget(
        self, 
        action: #selector(answerChanged(_:)), 
        forControlEvents: .EditingChanged)

    currentQuestion.text = questions[currentQuestionIndex]
}

然后处理对您的答案字段文本的更改:

func answerChanged(sender: AnyObject)
{
    if (answerField.text ?? "") == answers[currentQuestionIndex]
    {
        currentQuestionIndex = currentQuestionIndex + 1 < questions.count ? currentQuestionIndex + 1 : 0
        currentQuestion.text = questions[currentQuestionIndex]
    }
}

或者类似的东西。