输入附件视图行为异常与键盘隐藏和显示事件

Question

我在使用 InputAccessoryView 时遇到了一个奇怪的行为，我正在使用 InputAccessoryView 的聊天屏幕上工作，我已经注册了 KeyboardWillShow 和 KeyboardWillHide 通知。当我的聊天屏幕出现时，它会自动调用一次KeyboardWillShowMethod，之后它会自动隐藏而不调用KeyboardWillHide 通知。加载聊天后，当我单击文本框输入文本时，它调用KeyboardWillShow，这很好。但是当我尝试隐藏键盘时，它首先调用两个方法，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Image。 这是显示键盘的时候Image

我正在以编程方式使用此InputAccessoryView 代码inputAccessoryView

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 插入，因为我没有得到键盘的高度，这也是一个问题。键盘高度始终为 inputAccessoryView 高度的 50。

Answer 1

这是我为@Amit 找到的解决方案。我没有使用UIKeyboardFrameBeginUserInfoKey，而是使用了UIKeyboardFrameEndUserInfoKey，在这样做之后，我能够在KeyboardWillAppear方法中获得准确的键盘高度。现在剩下的问题是KeyboardWillShow 方法在KeyboardWillHide 之后被调用，但当时KeyboardWillShow 的键盘高度为50。 这意味着当我尝试隐藏键盘时，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，所以我把条件放在那里。

现在下面的方法只有在高度大于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

            })
        }
    }

Answer 2

当键盘有输入附件视图时，keyboardDidHideNotification被观察两次：

1. 键盘隐藏时。
2. 当输入附件视图被隐藏时（注意输入附件视图在键盘关闭后的一段时间内可见）。

如果您的实现依赖于仅调用一次的选择器，您可以执行以下解决方法之一：

选项 A：检查键盘框架：

@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
    }
}

选项 B：使用 GDC 的油门反应：

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)
}