选择文本字段时向上滑动的视图消失，点击键盘时消失

Question

我正在尝试复制 whatsapp、imessage 等键盘，发送按钮/文本字段位于其顶部 我有一个 TableView 和一个包含文本字段和发送按钮的容器视图。

每次我点击文本字段时，容器视图都会上升并“坐在”键盘上，但是一旦我开始输入，容器视图就会消失并进入最初的底部。为什么会这样？？

override func viewDidLoad() {
messageTextfield.delegate=self
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow(_:)), name:NSNotification.Name.UIKeyboardWillShow, object: self.view.window)
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide(_:)), name:NSNotification.Name.UIKeyboardWillHide, object: self.view.window)
}

@objc func keyboardWillShow(_ sender: Notification) {

   let duration = sender.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
    let curve = sender.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
    let beginningFrame = (sender.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
    let endFrame = (sender.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
    let deltaY = endFrame.origin.y - beginningFrame.origin.y

    UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations: {
        self.containerView.frame.origin.y += deltaY
    }, completion: nil)

}


@objc func keyboardWillHide(_ sender: Notification) {
    let userInfo: [AnyHashable: Any] = sender.userInfo!
    let keyboardSize: CGSize = (userInfo[UIKeyboardFrameBeginUserInfoKey]! as AnyObject).cgRectValue.size
    self.containerView.frame.origin.y += keyboardSize.height

}
override func viewDidDisappear(_ animated: Bool) {
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: self.view.window)
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: self.view.window)
}



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


override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?){

   super.touchesBegan(touches, with: event)
    view.endEditing(true)
}

Answer 1

您的代码中的问题是您在键盘 show/hide 中增加了容器视图的 y 位置，因此更改为这个

 @objc  func handleKeyboardDidShow (notification: NSNotification)
 {
    let keyboardRectAsObject = notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue

    var keyboardRect = CGRect.zero

    keyboardRectAsObject.getValue(&keyboardRect)

    self.containerViewBotcon.constant = -1 * keyboardRect.height 

    UIView.animate(withDuration: 0.5,animations: {

       self.view.layoutIfNeeded()

    })

} 

@objc func handleKeyboardWillHide(notification: NSNotification)
{

    self.containerViewBotcon.constant = 0

    UIView.animate(withDuration: 0.5,animations: {

       self.view.layoutIfNeeded()

    })

}