swift - 如何比较文本字段内的文本字段值？

Question

我最近一直在学习使用 xCode 编写 Swift 代码。我创建了一个简单的 Storyboard，并尝试比较文本字段内的文本字段值。

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)."
    }

错误出现在 userTextField.text! 上，它显示:
类型“(UITextField) -> ()”的值没有成员“text”

Answer 1

您正在比较userTextField，它是方法名称，它应该是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)."
    }
}