教程类型“NSNotification.Name”没有成员“UIResponder”中的 Swift 5 不起作用

Posted 2023-03-13

【中文标题】教程类型“NSNotification.Name”没有成员“UIResponder”中的 Swift 5 不起作用

【英文标题】：Swift 5 doesn't working method from tutorial Type 'NSNotification.Name' has no member 'UIResponder'

【发布时间】：2020-11-04 09:16:18

【问题描述】：

我对编程和 swift 非常陌生，所以我在 YouTube 上学习教程。我按照示例编写代码，但遇到了一个错误。告诉我如何解决它。在教程中，您应该有一个出现和消失的键盘。

import UIKit

class ViewController: UIViewController 

  
    override func viewDidLoad() 
        super.viewDidLoad()
        registerForKeyBoardNotification()
    
    
    deinit 
        removeKeyBoardNotification()
    
    
    @IBOutlet weak var scrollViewLogInScreen: UIScrollView!
    @IBOutlet weak var topTextField: UITextField!
    @IBOutlet weak var bottomTextField: UITextField!
    
    @IBAction func logInButtonTapped(_ sender: UIButton) 
        topTextField.resignFirstResponder()
        bottomTextField.resignFirstResponder()
    
    
    @objc

    This code doesn't work with following errors:
    Type 'NSNotification.Name' has no member 'UIResponder' 

    **func registerForKeyboardNotification() 
        NotificationCenter.default.addObserver(self, selector: #selector(kbWillShow), name: NSNotification.Name.UIResponder.keyboardWillShowNotification, object: nil)
        
        NotificationCenter.default.addObserver(self, selector: #selector(kbWillHide), name: NSNotification.Name.UIResponder.keyboardWillHideNotification, object: nil)
    **
    
     This code also doesn't work with following errors:
        Type 'NSNotification.Name' has no member 'UIResponder'

    **func removeKeyBoardNotification() 
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.removeObserver(self, name:
        NSNotification.Name.UIResponder.keyboardWillHideNotification, object: nil)
    **
    
    func kbWillShow(_ notification: Notification) 
        let userInfo = notification.userInfo
        let kbFrameSize = (userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
        scrollViewLogInScreen.contentOffset = CGPoint.init(x: 0, y: kbFrameSize.height)
    
    
    func kbWillHide() 
        scrollViewLogInScreen.contentOffset = CGPoint.zero
        
    

【参考方案1】：

只需删除名称中的NSNotification.Name

NotificationCenter.default.addObserver(self, selector: #selector(kbWillShow), name: NSNotification.Name.UIResponder.keyboardWillShowNotification, object: nil)

一定是这样的：

 NotificationCenter.default.addObserver(self, selector: #selector(kbWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)