ios 按下返回键时如何隐藏键盘 - Swift

How to hide keyboard when return key is hit - Swift

提问by stevetheipad

Trying to hide the iOS keyboard when the return key is hit, but instead it halts and gives me the error seen in the image. Here's the code I'm using:

尝试在按下返回键时隐藏 iOS 键盘，但它会停止并显示图像中的错误。这是我正在使用的代码：

@IBOutlet weak var scoreText: UITextField!

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

回答by Mr. Xcoder

Your problem is that you didn't delegate a textField in order to use that method. First, your class must include the UITextFieldDelegateprotocol:

您的问题是您没有委托 textField 来使用该方法。首先，您的类必须包含UITextFieldDelegate协议：

class yourClass: UIViewController, UITextFieldDelegate { ... }

And in the viewDidLoad()method, add this as well:

在viewDidLoad()方法中，也添加这个：

scoreText.delegate = self

And then you have to change this:

然后你必须改变这个：

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

to this:

对此：

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

Final code:

最终代码：

class yourClass: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var scoreText: UITextField!

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

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

If this is not working, the problem is not the textFieldShouldReturn()function. Please check your outlet connections.

如果这不起作用，则问题不在于textFieldShouldReturn()功能。请检查您的插座连接。

回答by Mochi

Try this

尝试这个

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

回答by Enamul Haque

In swift 4 or 5 , You can use like :

在 swift 4 或 5 中，您可以使用像：

1. create a project
2. add UITextField & connect to ViewController
3. implement UITextFieldDelegate to ViewController
4. Initialize the UITextField delegate
5. Add textFieldShouldReturn method in ViewController

6. Here is full code

   class ViewController: UIViewController,UITextFieldDelegate {
   
    //Connect to text field
    @IBOutlet weak var scoreText: UITextField!
   
    override func viewDidLoad() {
      super.viewDidLoad()
   
       //must initialize delegate
       scoreText.delegate = self
     }
   
    //add method
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
       textField.resignFirstResponder()
       return true
    }  
   
   }
   

1. 创建项目
2. 添加 UITextField 并连接到 ViewController
3. 将 UITextFieldDelegate 实现到 ViewController
4. 初始化 UITextField 委托
5. 在 ViewController 中添加 textFieldShouldReturn 方法

6. 这是完整的代码

   class ViewController: UIViewController,UITextFieldDelegate {
   
    //Connect to text field
    @IBOutlet weak var scoreText: UITextField!
   
    override func viewDidLoad() {
      super.viewDidLoad()
   
       //must initialize delegate
       scoreText.delegate = self
     }
   
    //add method
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
       textField.resignFirstResponder()
       return true
    }  
   
   }