今天在写评论页面，需要实现评论框和页面一起动起来

使用固定高度

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enum Move {
    case up
    case down
}

func animatetextView(textView: UITextView, move: Move)
{
    let movementDistance:CGFloat = -350
    let movementDuration: Double = 0.3

    var movement:CGFloat = 0
    if move == .up
    {
        movement = movementDistance
    }
    else
    {
        movement = -movementDistance
    }

    UIView.animate(withDuration: movementDuration) {
        self.commentView.frame = self.commentView.frame.offsetBy(dx: 0, dy: movement)

    }
}

这就得靠手感了得一个个测，引用方法是UITextView的delegate的textViewDidBeginEditing(_ textView: UITextView)方法和textViewDidEndEditing(_ textView: UITextView)方法

至于关闭编辑，override ViewController的touchesBegan方法，让textView关闭编辑就好了

通过观察者获取值

在viewDidLoad里面添加

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NotificationCenter.default.addObserver(self, selector: #selector(keyboardShow(note:)), name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardDisappear(note:)), name: UIResponder.keyboardWillHideNotification, object: nil)

通过其知道什么时候键盘的打开和关闭

然后实现对应的方法

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@objc func keyboardShow(note: Notification)  {
            guard let userInfo = note.userInfo else {return}
        guard let keyboardRect = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect else{return}
        UIView.animate(withDuration: 5) {
            self.commentView.transform = CGAffineTransform.init(translationX: 0, y: -keyboardRect.height)
        }
    }
    @objc func keyboardDisappear(note: Notification)  {
            guard let userInfo = note.userInfo else {return}
        guard let keyboardRect = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect else{return}
        UIView.animate(withDuration: 5) {
            self.commentView.transform = CGAffineTransform.identity
            
        }
    }

本来我看的文档里还需要获取keyboard的动画时间，不过试了一下似乎不需要，应该是改进了吧