Question

我最近学习使用xCode编写Swift代码。我创建了一个简单的故事板，并试图比较文本域内的文本字段值。

这是我的代码：

var numberone = 0
var numbertwo = 0
var answerstring :String = ""
var answerint :Int = 0
var userInput :String = ""

@IBAction func userTextField(_ sender: UITextField) {

    numberone = randomInt(min: 1, max: 9)
    numbertwo = randomInt(min: 1, max: 9)
    questionLabel.text = "\(numberone) + \(numbertwo)"
    answerint = numberone + numbertwo
    answerstring = "\(answerint)"
    if  userTextField.text! = "\(answerstring)" {
        questionResponse.text! = "Correct!"
    } else {
        questionResponse.text! = "Incorrect. The answer was \(answerint)."
    }

错误发生在 userTextField.text！上，并显示：
Value of type '(UITextField) -> ()' has no member 'text'

Answer 1

您正在比较userTextField这是方法名称，而应该是sender：

@IBAction func userTextField(_ sender: UITextField) {
    numberone = randomInt(min: 1, max: 9)
    numbertwo = randomInt(min: 1, max: 9)
    questionLabel.text = "\(numberone) + \(numbertwo)"
    answerint = numberone + numbertwo
    answerstring = "\(answerint)"
    // here is the change, 'sender' instead of 'userTextField':
    if  sender.text! = "\(answerstring)" {
        questionResponse.text! = "Correct!"
    } else {
        questionResponse.text! = "Incorrect. The answer was \(answerint)."
    }
}

Answer 2

您必须从@IBAction收到的发件人处获取文本字段。

这很简单。发件人是您想要的文本字段。

首先：

    if sender.text! == "\(yourVariable)" {
        //do something
    }else{
        //do someting
    }

记得使用double equals进行比较。如果您只使用一个，它将设置文本字段的值。

如何比较文本字段中的文本字段值？

2 个答案: