在ViewController类中，为每个文本字段创建一个@IBOutlet属性，方法是按住Ctrl键并将每个文本字段从情节提要拖到代码中

@IBOutlet weak var textFieldFirst: UITextField!
@IBOutlet weak var textFieldSecond: UITextField!

另外，创建一个私有UITextField属性来保存（可能）当前（/最近使用的）文本字段。

private var currentTextField: UITextField?

重写UIViewController子类的viewDidLoad方法，以初始化两个“public”文本字段示例的委托

override func viewDidLoad() {
    super.viewDidLoad()

    // Handle the user input in the text fields through delegate callbacks (and set tags)
    textFieldFirst.delegate = self
    textFieldFirst.tag = 1
    textFieldSecond.delegate = self
    textFieldSecond.tag = 2
}

此外，使用UITextFieldDelegate的两个textFieldShouldReturn(...)和textFieldDidBeginEditing(...)方法分别将（活动）文本字段的状态重新指定为第一响应者，并更新currentTextField引用。

// UITextFieldDelegate
func textFieldShouldReturn(textField: UITextField) -> Bool {
    // User finished typing (hit return): hide the keyboard.
    textField.resignFirstResponder()
    return true
}

func textFieldDidBeginEditing(textField: UITextField) {
    currentTextField = textField
}

最后，如果在编辑过程中按下submit，则将任何可能的当前文本字段重新指定为第一响应者

@IBAction func Submit(sender: UIButton) {
    if let currentTextField = currentTextField {
        currentTextField.resignFirstResponder()
    }
    print(firstName)
    print(lastName)
}

这样，您的视图控制器就可以正常工作了。
总结一下：添加和修改上述内容后，您的ViewController类应该如下所示

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    // Properties
    @IBOutlet weak var textFieldFirst: UITextField!
    @IBOutlet weak var textFieldSecond: UITextField!
    private var currentTextField: UITextField?
    var firstName = ""
    var lastName = ""

    @IBOutlet var buttonUI: UIButton!
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    // Actions
    @IBAction func Submit(sender: UIButton) {
        if let currentTextField = currentTextField {
            currentTextField.resignFirstResponder()
        }
        print(firstName)
        print(lastName)
    }

    // viewDidLoad
    override func viewDidLoad() {
        super.viewDidLoad()

        // handle the user input in the text fields through delegate callbacks
        textFieldFirst.delegate = self
        textFieldSecond.delegate = self

        // tags
        textFieldFirst.tag = 1
        textFieldSecond.tag = 2
    }

    // UITextFieldDelegate
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        // User finished typing (hit return): hide the keyboard.
        textField.resignFirstResponder()
        return true
    }

    func textFieldDidBeginEditing(textField: UITextField) {
        currentTextField = textField
    }

    func textFieldDidEndEditing(textField: UITextField) {
        switch textField.tag {
        case 1:
            firstName = textField.text!
            print(firstName)
        case 2:
            lastName = textField.text!
            print(lastName)
        default: break
        }
    }
}

什么叫
我在打印第二个文本字段的用户输入时遇到问题，因为用户单击“提交”时编辑从未结束。
为什么不在用户按提交时读取文本字段中的值呢？请确保您的插座和代表是正确的。
对你的按钮Touch up inside做一个动作，在那个按钮里你会读到值：

firstName = textFieldOne.text
lastName = textFieldTwo.text

如果还有人需要的话，可以加

view.endEditing(true)

在你的纽扣里在牢房外
并将其添加到表viewCell中

func textFieldShouldReturn(textField: UITextField) -> Bool {
        // User finished typing (hit return): hide the keyboard.
        textField.resignFirstResponder()
        return true
}

我实施了dfri的建议，很有效！！！
导入UIKit
类视图控制器：UI视图控制器、UI文本字段委托{

var firstName = ""
var lastName = ""

@IBOutlet var NameTextField: UITextField!
@IBOutlet var PasswordTextField: UITextField!

@IBOutlet var buttonUI: UIButton!
override func viewDidLoad() {
    super.viewDidLoad()
}

@IBAction func Submit(sender: UIButton) {

    PasswordTextField.resignFirstResponder() // this works and dismisses the editing ( outlets need to be connected aswell for the textfields)
    print(firstName)
    print(lastName)

}

func textFieldDidEndEditing(textField: UITextField) {

    switch textField.tag {

    case 1:
          firstName = textField.text!
        print(firstName)
    case 2:

        lastName = textField.text!
        print(lastName)

    default: break
    }

}

}