检查文本字段是否为空 Swift [英] Checking if textfields are empty Swift

问题描述

我知道有大量堆栈溢出页面解释了如何执行此操作，但是每次我从此处获取代码并将其放入时，我都会遇到相同的错误，并且该错误是字符串"的值?没有成员文本" 任何可以快速检查文本字段是否为空的可靠方法的想法?

I know there are tons of stack overflow pages out there that explain how to do this but everytime I take the code from here and put it in i get the same error and that error is value of "string?" has no member "text" Any ideas of a solid way that will work for checking if a textfield is empty in swift?

let userEmail = userEmailTextField.text;
// Check for empty fields
if (userEmail.text.isEmpty) {
    // Display alert message
    return;
}

推荐答案

这篇文章 给出了很好的答案(这是一个可惜它没有已接受"标记).使用 (self.field.text?.isEmpty ?? true).

This post is given a good answer (it's a pity it has no "accepted" mark). Use (self.field.text?.isEmpty ?? true).

假设您的 textField 声明为:

    @IBOutlet weak var textField: UITextField!

您可以通过以下方式检查其是否为空:

You can check its emptiness with:

    if textField.text?.isEmpty ?? true {
        print("textField is empty")
    } else {
        print("textField has some text")
    }

<小时>

要在您编辑的帖子中使用变量:

---

To use the variables in your edited post:

    let userEmail = userEmailTextField.text;
    // Check for empty fields
    if userEmail?.isEmpty ?? true {
        // Display alert message
        return;
    }

或:

    // Check for empty fields
    if userEmailTextField.text?.isEmpty ?? true {
        // Display alert message
        return;
    }

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