因为我编辑的@King-Wizard的回答被拒绝了，所以发布了一个新的答案。

让你的类成为UITextField的委托并重写touchesBegan。

斯威夫特4

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet var textField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        textField.delegate = self
    }

    //Called when 'return' key is pressed. Return false to keep the keyboard visible.
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        return true
    }

    // Called when the user clicks on the view (outside of UITextField).
    override func touchesBegan(touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(true)
    }

}

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。

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!
}
}

  import UIKit

  class ItemViewController: UIViewController, UITextFieldDelegate {

  @IBOutlet weak var nameTextField: UITextField!

    override func viewDidLoad() {
           super.viewDidLoad()
           self.nameTextField.delegate = self
     }

    // Called when 'return' key pressed. return NO to ignore.

    func textFieldShouldReturn(textField: UITextField) -> Bool {

            textField.resignFirstResponder()
             return true
     }

 // Called when the user click on the view (outside the UITextField).

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)    {
      self.view.endEditing(true)
  }
}

如果你使用滚动视图，它会简单得多。

只需在故事板中交互式地选择解散。

override func viewDidLoad() {
        super.viewDidLoad()

self.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(tap)))

}

func tap(sender: UITapGestureRecognizer){
        print("tapped")
        view.endEditing(true)
}

试试这个，很管用