首先在任何swift文件中写入此扩展名

extension UIViewController {
    func hideKeyboardWhenTappedAround() {
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(UIViewController.dismissKeyboard))
        view.addGestureRecognizer(tap)

    }

    func dismissKeyboard() {
        view.endEditing(true)
    }
}

而在视图的viewDidLoad中，任何视图控制器都有textField。

self.hideKeyboardWhenTappedAround()

Swift 4，5.我总是使用隐藏键盘时，点击周围和返回按钮.

override func viewDidLoad() {
    super.viewDidLoad()
    hideKeyboardWhenTappedAround()
    emailTextField.delegate = self // your UITextfield
    passwordTextField.delegate = self // your UITextfield
}

//隐藏键盘

extension EmailAutorization: UITextFieldDelegate {

 // Return button tapped
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    textField.resignFirstResponder()
    return true
}

// Around tapped
func hideKeyboardWhenTappedAround() {
    let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(EmailAutorization.dismissKeyboard))
    tap.cancelsTouchesInView = false
    view.addGestureRecognizer(tap)
}

@objc func dismissKeyboard() {
    view.endEditing(true)
 }
}

*以下是在键盘打开时关闭键盘并向上移动视图的解决方案：斯威夫特酒店5

override func viewDidLoad() {
    super.viewDidLoad()
    let tap = UITapGestureRecognizer(target: self, action: #selector(taped))
    view.addGestureRecognizer(tap)
    NotificationCenter.default.addObserver(self, selector: #selector(KeyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(KeyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}

 //This Method Will Hide The Keyboard
@objc func taped(){
  self.view.endEditing(true)   
}

@objc func KeyboardWillShow(sender: NSNotification){

    let keyboardSize : CGSize = ((sender.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.size)!
    if self.view.frame.origin.y == 0{
        self.view.frame.origin.y -= keyboardSize.height
    }

}

@objc func KeyboardWillHide(sender : NSNotification){

    let keyboardSize : CGSize = ((sender.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size)!
    if self.view.frame.origin.y != 0{
        self.view.frame.origin.y += keyboardSize.height
    }

}
   override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(true)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
}

你有没有试着调试程序，看看代码是否在函数中停止（有断点）？通常这段代码应该可以工作...检查那些textFields是在super view还是在child view中，如果是，也许你应该调用self.childView.endEditing(true)。
如果你真的使用多个textField，也许你应该尝试IQKeyboardManager库。我在我所有的项目中都使用它。你可以在这里找到它：https://github.com/hackiftekhar/IQKeyboardManager .使用简单，支持良好。只需通过可可pods安装它，将IQKeyboardManager.sharedManager().enable = true放入AppDelegate中，即可开始使用。：）

您确定正在调用touchesBegan吗？如果你确定，尝试将self.resignFirstResponder()添加到touchesBegan函数中。这告诉你的视图控制器它不再是第一个响应者，应该关闭键盘。
如果没有，您需要做的是创建一个UITapGestureRecognizer，将其添加到视图中，并将其连接到调用self.resignFirstResponder()的函数。