ios - 将 ScrollView 移动到原始状态

Question

我想在键盘出现时向上移动 View ，并在键盘消失时将 View 向后移动。我为此使用 ScrollView 。

我有这个几乎工作。我的错误是这样的:

你触发键盘显示

你触发键盘隐藏

到目前为止，事情进展顺利。

你触发键盘显示

您触发键盘隐藏 <-- 这不再起作用了，但第一次它可以完美运行。

键盘出现时的代码(超时工作):

func keyboardWasShown(notification: NSNotification) {
    var userInfo = notification.userInfo!
    let keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
    let buttonOrigin: CGPoint = btn.frame.origin
    let buttonHeight: CGFloat = btn.frame.size.height
    var visibleRect: CGRect = view.frame

    visibleRect.size.height -= keyboardFrame.size.height
    if !visibleRect.contains(buttonOrigin) {
        let scrollPoint = CGPoint(x: CGFloat(0.0), y: CGFloat(buttonOrigin.y - visibleRect.size.height + (buttonHeight + 8)))
        scrollView.setContentOffset(scrollPoint, animated: true)
    }
}

键盘要隐藏时的代码(此代码第一次有效，第二次无效):

func keyboardWillBeHidden(notification: NSNotification){
    var info = notification.userInfo!
    let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size

    let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, -keyboardSize!.height, 0.0)

    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets
    self.view.endEditing(true)
    self.scrollView.isScrollEnabled = false
}

这就是我的观点:


当键盘显示时，一切都需要向上移动。上移作品:



但是当键盘消失时它不起作用:

Answer 1

只需更改此行
let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, -keyboardSize!.height, 0.0)
和
let contentInsets : UIEdgeInsets = .zero
或试试这个

//MARK:- 键盘方法

  func keyboardWillOpen(sender:Notification) {

        if let info = sender.userInfo{

            if let keyboardSize = info[UIKeyboardFrameBeginUserInfoKey] as? CGRect{
                let contentInsets = UIEdgeInsetsMake(0, 0, -keyboardSize.height, 0)


            self.scrollView.contentInset = contentInsets
            self.scrollView.scrollIndicatorInsets = contentInsets
            }
        }
    }

    func keyboardWillHide(notification:Notification) {

        if let info = notification.userInfo {

            if let keyboardSize = info[UIKeyboardFrameBeginUserInfoKey] as? CGRect {

            self.scrollView.contentInset = .zero
            self.scrollView.scrollIndicatorInsets = .zero

            }
        }
    }