使用键盘时使文本字段向上滑动 swift 5答案

【问题标题】：Make the textfiled swipe up when keyboard is used swift 5使用键盘时使文本字段向上滑动 swift 5
【发布时间】：2019-12-02 18:56:54
【问题描述】：

我正在尝试让文本字段txtAdd 在键盘出现时向上滑动，但我不太确定该怎么做。

这是向列表中添加项目的代码：

@IBAction func submitBntFunc(_ sender: Any) {
    if let text = txtAdd.text{
             if text == ""{
                 return
             }
             txtAdd.text = ""
             txtAdd.resignFirstResponder()
        return txtField.text.append("\(text) \n")

         }

}

我尝试使用下面的代码，但它并没有真正起作用。

guard let keyboardSize = userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue else {return}

【问题讨论】：

标签： ios swift xcode11 swift5

【解决方案1】：

试试这段代码

var originButton : CGFloat?

override func viewDidLoad()
{
     originButton = self.YOURBUTTON.frame.origin.y
     NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
     NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)

}

@objc func keyboardWillShow(notification: NSNotification) {
    if let keyboard = ((notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue) {
        if self.view.frame.origin.y == 0 {
            self.YOURBUTTON.frame.origin.y -= keyboard.height

        }
    }
}

@objc func keyboardWillHide(notification: NSNotification) {
    if self.YOURBUTTON.frame.origin.y != originButton {
        self.YOURBUTTON.frame.origin.y = originButton!
    }
}

【讨论】：

它似乎只是向上滑动的按钮，而不是提交的“txtAdd”......
我添加了这一行 `self.txtAdd.frame.origin.y -= keyboard.height ` 但随后它一直向上滑动到顶部
每次点击屏幕时，txtAdd 都会向上滑动
你在使用约束吗？添加这一行'self.view.layoutIfNeeded()'

【解决方案2】：

在你的 viewDidLoad 方法中添加这个观察者：=

    NotificationCenter.default.addObserver(self, selector: #selector(keyboard), name: UIResponder.keyboardWillHideNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboard), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)

就是调用这个函数：=

    @objc func keyboard(notification: Notification){
    let userInfo = notification.userInfo!
    let keyboardScreenEndFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
    let keyboardViewEndFrame = view.convert(keyboardScreenEndFrame, to: view.window)

    if notification.name == UIResponder.keyboardWillHideNotification{
        //add your constrain here when keyboard is hiden
        self.scrollView.contentInset = UIEdgeInsets.zero
    }else{
        //add your constrain here when keyboard is visible
        self.scrollView.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: keyboardViewEndFrame.height, right: 0)
    }
    scrollView.scrollIndicatorInsets = scrollView.contentInset
}

【讨论】：