Swift “输入附件视图”在键盘隐藏和显示事件中意外行为

我在使用InputAccessoryView时遇到了一个奇怪的行为，我正在聊天屏幕上使用InputAccessoryView，我在其中注册了KeyboardWillShow和KeyboardWillHide通知。当我的聊天屏幕出现时，它会自动调用KeyboardWillShowMethod一次，然后自动隐藏，而不调用KeyboardWillHide通知。加载聊天后，当我点击文本框键入它调用的文本时，Keyboard将显示这一点。但当我试图隐藏keybaord时，它会调用两个方法，首先它会调用KeyboardWillHide，然后它会调用KeyboardWillShow，这很奇怪

这是我隐藏键盘时的聊天屏幕。 此时显示键盘

我以编程的方式使用这个InputAccessoryView代码

这就是我注册键盘通知的方式

  func handleKeyBoard(){
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    }

 @objc func keyboardWillShow(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            var contentInset = self.collectionView?.contentInset
            contentInset?.bottom = keyboardSize.maxY
            self.collectionView?.contentInset = contentInset!
            self.collectionView?.scrollIndicatorInsets = contentInset!
          //  collectionViewBottomAnchor?.constant = keyboardSize.height + 50

//            print ("input height  \(inputAccessoryView?.frame.maxY) ")
//            print("keyboard height \(keyboardSize.height)")
//            print("keyboard Y \(keyboardSize.maxY)")
//            print("keyboard Y \(keyboardSize.minY)")
            //print("keyboard Y \(inputAccessoryView.framemaxY)")


            if self.messages.count > 0{
                UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
                    self.view.layoutIfNeeded()

                }, completion: { (completed:Bool) in
                    let indexPath = IndexPath(item: self.messages.count - 1, section: 0)
                    self.collectionView?.scrollToItem(at: indexPath, at: .bottom, animated: true)

                })
            }
        }
    }

@objc func keyboardWillHide(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {

            print("keyboard hide")
          self.collectionView?.contentInset = UIEdgeInsets(top: 8, left: 0, bottom: 52, right: 0)

            self.collectionView?.scrollIndicatorInsets = UIEdgeInsets(top: 8, left: 0, bottom: 52, right: 0)
            UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
                self.view.layoutIfNeeded()

            }, completion: { (completed:Bool) in

            })
        }
    }

---

在选择器中，我试图根据键盘的Y索引更改我的CollectionView插图，因为我无法获得键盘的高度，这也是一个问题。kyeboard的高度始终是输入AccessoryView高度的50。

这是我找到的解决方案，它可以解决@Amit。我没有使用UIKeyboardFrameBeginUserInfo键，而是使用了UIKeyboardFrameEndUserInfo键。完成此操作后，我能够在KeyboardWillAppear方法中获得准确的键盘高度。现在仍然存在的问题是，KeyboardWillShow方法在KeyboardWillHide之后被调用，但当时KeyboardWillShow的键盘高度为50。 这意味着当我试图隐藏键盘时，它会调用KeyboardWillHide，这很好，之后它会自动调用KeyboardWillShow，但键盘的高度仍然是50，所以我在那个里设置了条件

现在，以下方法只有在高度超过50时才会生效

@objc func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {

        if keyboardSize.height > 50{
                var contentInset = self.collectionView?.contentInset
                contentInset?.bottom = keyboardSize.height + 50
                self.collectionView?.contentInset = contentInset!
                self.collectionView?.scrollIndicatorInsets = contentInset!


            if self.messages.count > 0{
                UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
                    self.view.layoutIfNeeded()

                }, completion: { (completed:Bool) in
                                        let indexPath = IndexPath(item: self.messages.count - 1, section: 0)
                                        self.collectionView?.scrollToItem(at: indexPath, at: .bottom, animated: true)

                })
            }
        }

    }
}

@objc func keyboardWillHide(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {

            self.collectionView?.contentInset = UIEdgeInsets(top: 8, left: 0, bottom: 52, right: 0)
            self.collectionView?.scrollIndicatorInsets = UIEdgeInsets(top: 0, left: 0, bottom: 52, right: 0)
            UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
                self.view.layoutIfNeeded()

            }, completion: { (completed:Bool) in

            })
        }
    }

当键盘具有“输入附件”视图时，将观察键盘显示两次：

当键盘被隐藏时。 当input accessroy视图处于隐藏状态时，请注意，键盘关闭后，input accessroy视图将在一段时间内可见。 如果您的实现依赖于只调用一次选择器，则可以执行以下解决方法之一：

选项A：检查键盘框架：

选项B：使用GDC的油门反应：

---

显示您的选择器代码。@RakeshaShastri我已使用选择器方法更新了问题。请尝试使用UIKeyboardFrameBeginUserInfoKey代替UIKeyboardFrameBeginUserInfoKey。同时检查此项：如果对您的场景有帮助。嘿@Amit谢谢。这很有帮助。

@objc
private func keyboardDidHide(_ notification: Notification) {
    guard let keyboardRect = notification.keyboardRect, keyboardRect.origin.y == view.frame.maxY else {
        return
    }
    // Do whatever you need...
}

extension Notification {
    var keyboardRect: CGRect? {
        guard let keyboardSize = userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else {
            return nil
        }
        return keyboardSize.cgRectValue
    }
}

private var pendingKeyboardDidHideRequestWorkItem: DispatchWorkItem?

private func keyboardDidHide(_ notification: Notification) {
    pendingKeyboardDidHideRequestWorkItem?.cancel()

    let keyboardDidHideRequestWorkItem = DispatchWorkItem { [weak self] in
        // Do whatever you need...
    }

    pendingKeyboardDidHideRequestWorkItem = keyboardDidHideRequestWorkItem
    DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(500), execute: keyboardDidHideRequestWorkItem)
}