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用键盘移动屏幕

keyboard uiview swift ios

user · 技术社区 · 7 年前

我想在显示键盘时向上移动屏幕,在隐藏键盘时向下移动屏幕。

我使用此代码:

override func viewDidLoad() {
        super.viewDidLoad()

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

}

@objc func keyboardWillShow(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y == 0{
                self.view.frame.origin.y -= keyboardSize.height
            }
        }
    }

    @objc func keyboardWillHide(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y != 0{
                self.view.frame.origin.y += keyboardSize.height
            }
        }
    }

但我有一个问题: http://gph.is/2AvLo1A

在这个屏幕上,我点击textField来显示键盘,然后点击空白来隐藏键盘几次。我的屏幕向下爬行,黑色背景填满了整个屏幕。如何修复它?

更新:

http://gph.is/2F7nux5

显示键盘后,我在底部有了新的空白。如果我滚动,我可以看到它: https://imgur.com/a/fFyEC

2 回复 | 直到 7 年前

Shehata Gamal 7 年前

将scrollview的底部约束挂接到SuperView的底部,并将其作为IBMoutlet拖动,然后执行此操作

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

          self.scrollviewBottomCon.constant = keyboardSize.height
          self.view.layoutIfNeeded()
          self.scrollView.scrollRectToVisible((self.textfeild.frame), animated: true)
    }
}

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

            self.scrollviewBottomCon.constant = 0

            self.view.layoutIfNeeded()
    }
}

Derek 7 年前

尽量不要上下移动整个视图,而是移动真正需要移动的组件。我建议使用视图来包含要移动的元素。

我有一个用例,在容器视图的下面有一个coupe文本字段和一个submit按钮。当键盘出现时,我希望两个文本字段和按钮上升。我是这样处理的。

@objc func keyboardWillAppear(_ notification: NSNotification) {
    if let userInfo = notification.userInfo,
        let keyboardFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {

        // Calculate how much to move
        let submitButtonHeight = self.submitButton.frame.size.height
        var submitButtonOrigin = self.view.convert(self.submitButton.frame.origin, from: self.containerView)
        submitButtonOrigin.y = submitButtonOrigin.y + submitButtonHeight + 4.0
        var visibleRect = self.view.frame
        visibleRect.size.height -= keyboardFrame.height

        // If keyboard covers the button, move the container up
        if !visibleRect.contains(submitButtonOrigin) {
            let keyboardMove = submitButtonOrigin.y - visibleRect.size.height
            if keyboardMove > 0 {
                UIView.animate(withDuration: 0.3) {
                    self.containerView.transform = CGAffineTransform(translationX: 0, y: -keyboardMove)
                }
            }
        }
    }
}

@objc func keyboardWillDisappear(_ notification: NSNotification) {
    UIView.animate(withDuration: 0.3) {
        self.containerView.transform = CGAffineTransform.identity
    }
}

这可能是您的解决方案,也可能不是,但可以提供另一种选择。