ios - 容器 View 不会提升

Question

我有一些代码应该在键盘输入一些文本时引发容器 View 。我感觉我肯定有实现了这个权利，但 TextView 没有提升。

 var bottomConstraint: NSLayoutConstraint?


override func viewDidLoad() {
    super.viewDidLoad()
    navigationItem.title = "Comments"
    collectionView?.backgroundColor = UIColor.white
    self.navigationItem.hidesBackButton = true
    let backButton = UIBarButtonItem(image: UIImage(named: "icons8-Back-64"), style: .plain, target: self, action: #selector(GoBack))
    self.navigationItem.leftBarButtonItem = backButton

    self.collectionView?.register(CommentCell.self, forCellWithReuseIdentifier: cellID)
    collectionView?.scrollIndicatorInsets = UIEdgeInsets(top: 0, left: 0, bottom:-50, right: 0)

    collectionView?.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: -50, right: 0)
    collectionView?.alwaysBounceVertical = true
    collectionView?.keyboardDismissMode = .interactive

    setupKeyboardObserver()
    view.addSubview(containerView)


    view.addConstraintsWithFormat("H:|[v0]|", views: containerView)
    view.addConstraintsWithFormat("V:[v0(48)]", views: containerView)

这里我将常数设置为 0

    let bottomConstraint = NSLayoutConstraint(item: containerView, attribute: .bottom, relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1, constant: 0)
    view.addConstraint(bottomConstraint)


    NotificationCenter.default.addObserver(self, selector: #selector(handleKeyboardNotification), name: NSNotification.Name.UIKeyboardWillShow, object: nil)

       NotificationCenter.default.addObserver(self, selector: #selector(handleKeyboardNotification), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

    // Register cell classes
   // self.collectionView!.register(UICollectionViewCell.self, forCellWithReuseIdentifier: cellID)
    fetchComments()

}

在这里，我控制常量并使其对键盘高度使用react

func handleKeyboardNotification(notification: NSNotification){
    if let userinfo = notification.userInfo{

        let keyboardFrame = (userinfo[UIKeyboardFrameEndUserInfoKey] as AnyObject).cgRectValue
        bottomConstraint?.constant = -(keyboardFrame?.height)!

        let isKeyboardShowing = notification.name == NSNotification.Name.UIKeyboardWillShow
        bottomConstraint?.constant = isKeyboardShowing ? CGFloat(-(keyboardFrame?.height)!) : CGFloat(0)

    }
}

尽管如此，键盘仍然覆盖了容器 View 。当我手动更改常量时，它会移动，但这些函数似乎对动态移动 View 没有影响。我很困惑，任何帮助都会得到 WWE 冠军腰带的奖励。不，但说实话，我很感激您的帮助

Answer 1

我从您的代码中可以观察到，您正在使用单一方法管理从上到下的滚动，反之亦然，您只需要使用单独的方法来做到这一点，一个是在键盘出现时，另一个是在键盘出现时解雇

这里是示例片段，可能会对您有所帮助

为每个通知添加不同的选择器

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)  

使用以下方法处理键盘出现和消失事件

func keyboardWillShow(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y == 0{
                UIView.animate(withDuration: 0.1, animations: { () -> Void in
                    self.view.frame.origin.y -= keyboardSize.height
                })
            }
        }
    }

    func keyboardWillHide(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y != 0{
                UIView.animate(withDuration: 0.1, animations: { () -> Void in
                    self.view.frame.origin.y += keyboardSize.height 
                })
            }
        }
    }

注意:当你的 View 即将消失时，不要忘记删除观察者

NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil)