我找到了一个简单的解决办法: 1. 添加UITapGestureRecognizer到你的视图控制器 2. 添加IBAction到你的UITapGestureRecognizer 3.最后，您可以放弃第一个响应器

class ViewController: UIViewController
{

@IBOutlet var tap: UITapGestureRecognizer!
@IBOutlet weak var label: UILabel!
@IBOutlet weak var textField: UITextField!
override func viewDidLoad()
{
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}


@IBAction func dismissUsingGesture(_ sender: UITapGestureRecognizer)
{
   self.textField.resignFirstResponder()
    label.text = textField.text!
}
}

你可以打电话

resignFirstResponder()

在UIResponder的任何实例上，例如UITextField。如果你在当前导致键盘显示的视图上调用它，那么键盘将会消失。

斯威夫特3: 关闭键盘的最简单方法:

  //Dismiss keyboard method
    func keyboardDismiss() {
        textField.resignFirstResponder()
    }

    //ADD Gesture Recignizer to Dismiss keyboard then view tapped
    @IBAction func viewTapped(_ sender: AnyObject) {
        keyboardDismiss()
    }

    //Dismiss keyboard using Return Key (Done) Button
    //Do not forgot to add protocol UITextFieldDelegate 
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        keyboardDismiss()

        return true
    }

如何解散键盘时，你点击任何地方关闭它

 //Setup dismiss keyboard gesture
 let tap = UITapGestureRecognizer(target: self, action: #selector(UIInputViewController.dismissKeyboard))

     view.addGestureRecognizer(tap)
 }
 //Calling this function when the tapped
 @objc func dismissKeyboard() {

    view.endEditing(true)
 }

Swift 5只要两行就够了。添加到你的viewDidLoad应该工作。

 let tapGesture = UITapGestureRecognizer(target: view, action: #selector(UIView.endEditing))
 view.addGestureRecognizer(tapGesture)

如果你的点击手势阻止了一些其他的触摸，那么添加这一行:

tapGesture.cancelsTouchesInView = false

以下是如何通过点击其他地方来消除键盘，使用Swift 5只需两行。

(我讨厌添加另一个答案，但由于这是谷歌上的顶级结果，我将帮助像我这样的新手。)

在你的ViewController.swift中，找到viewDidLoad()函数。

加上这两行:

let tap: UIGestureRecognizer = UITapGestureRecognizer(target: self.view, action: #selector(UIView.endEditing))
        
view.addGestureRecognizer(tap)