如何比较textfield中的textfield值？

Question

我最近一直在学习如何使用xCode编写Swift代码。我创建了一个简单的故事板，并试图比较textfield中的textfield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，它说：

Value of type '(UITextField) -> ()' has no member 'text'

Answer 1

您正在比较userTextField，它是方法名，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)."
    }
}

Answer 2

您必须从您在@IBAction上接收到的发件人那里获取textfield。

这很简单。发件人是您想要的文本字段。

第一：

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

记得用双等于来比较。如果只使用一个，它将设置textfield的值。