在你正在使用的视图控制器中:

//suppose you are using the textfield label as this

@IBOutlet weak var emailLabel: UITextField!
@IBOutlet weak var passwordLabel: UITextField!

//then your viewdidload should have the code like this
override func viewDidLoad() {
        super.viewDidLoad()

        self.emailLabel.delegate = self
        self.passwordLabel.delegate = self

    }

//then you should implement the func named textFieldShouldReturn
 func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }

// -- then, further if you want to close the keyboard when pressed somewhere else on the screen you can implement the following method too:

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

斯威夫特3

将下面的代码添加到你的VC中

//hide keyboard when user tapps on return key on the keyboard
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    self.view.endEditing(true);
    return false;
}

对我有用

您可以使用以下函数使应用程序解除键盘

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    self.view.endEditing(true)
    return false
}

下面是一个完整的例子来更好地说明这一点:

//
//  ViewController.swift
//
//

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet var myTextField : UITextField

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        self.myTextField.delegate = self
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        self.view.endEditing(true)
        return false
    }
}

代码来源:http://www.snip2code.com/Snippet/85930/swift-delegate-sample

@RSC

对我来说，Xcode Version 6.2 (6C86e)的关键添加是override func viewDidLoad()

 self.input.delegate = self;

我试着用返回键让它工作了几个小时，直到我找到了你的帖子，RSC。谢谢你！

此外，如果你想隐藏键盘，如果你触摸屏幕上的其他地方:

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
        self.view.endEditing(true);
    }

override func viewDidLoad() {
    super.viewDidLoad()

    let tap = UITapGestureRecognizer(target: self, action: #selector(handleScreenTap(sender:)))
    self.view.addGestureRecognizer(tap)}

然后用这个函数

func handleScreenTap(sender: UITapGestureRecognizer) {
    self.view.endEditing(true)
}

我讨厌给每个UIViewController添加相同的函数。 通过扩展UIViewController来支持UITextFieldDelegate，你可以提供一个默认行为“返回按下”。

extension UIViewController: UITextFieldDelegate{
    public func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true;
    }
}

当你创建新的UIViewController和UITextField时，你所要做的就是在你的UIViewController中写一行代码。

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

你甚至可以通过在Main.storyboard中钩子委托来省略这一行代码。(使用“ctrl”从UITextField拖动到UIViewController)