当键盘弹出时,如何向上移动整个视图?(Swift)
底部的灰色框是文本视图。当我点击文本视图时,键盘将从底部弹出。但是,文本视图已被弹出式键盘覆盖当键盘弹出时,如何向上移动整个视图?(Swift),swift,Swift,底部的灰色框是文本视图。当我点击文本视图时,键盘将从底部弹出。但是,文本视图已被弹出式键盘覆盖 我应该添加哪些功能,以便在键盘弹出时向上移动整个视图 要检测键盘何时出现,您可以收听NSNotificationCenter NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil) NS
我应该添加哪些功能,以便在键盘弹出时向上移动整个视图 要检测键盘何时出现,您可以收听
NSNotificationCenter
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: “keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil)
这将调用键盘将显示和键盘将隐藏。在这里,您可以使用UITextfield
func keyboardWillShow(notification: NSNotification) {
if let userInfo = notification.userInfo {
if let keyboardSize = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
//use keyboardSize.height to determine the height of the keyboard and set the height of your textfield accordingly
}
}
}
func keyboardWillHide(notification: NSNotification) {
//pull everything down again
}
正如Milo所说,要自己完成这项工作,您需要注册键盘显示/隐藏通知
然后,您需要编写代码,计算出键盘在屏幕上隐藏了多少,以及相关字段在屏幕上的位置有多高,这样您就知道要改变多少视图
一旦你完成了,你要做什么取决于你是使用自动布局还是使用自动调整大小的遮罩(也称为“Struts and springs”样式的布局)
我写了一篇关于一个项目的开发人员博客文章,其中包括移动键盘的工作代码。请参阅此链接:
在那篇文章中,寻找底部标题为“滑动视图为键盘腾出空间”的链接。Swift 4
这段代码并不完美,但值得一试
首先将整个视图嵌入到滚动视图中
将这个可爱的小函数添加到您的类中:
@objc func keyboardNotification(_ notification: Notification) {
if let userInfo = (notification as NSNotification).userInfo {
let endFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
let duration:TimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
let animationCurveRawNSN = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber
let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIViewAnimationOptions().rawValue
let animationCurve:UIViewAnimationOptions = UIViewAnimationOptions(rawValue: animationCurveRaw)
if (endFrame?.origin.y)! >= UIScreen.main.bounds.size.height {
scrollViewBottomConstraint?.constant = 0
} else {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
let keyboardHeight:Int = Int(keyboardSize.height)
scrollViewBottomConstraint?.constant = CGFloat(keyboardHeight)
scrollView.setContentOffset(CGPoint(x: 0, y: (scrollViewBottomConstraint?.constant)! / 2), animated: true)
}
}
UIView.animate(withDuration: duration, delay: TimeInterval(0), options: animationCurve, animations: {
self.view.layoutIfNeeded()
}, completion: nil)
}
}
将此项添加到ViewDidLoad:
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardNotification(_:)), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
不要忘记将scrollView的底部约束连接到类(名称为“scrollViewBottomConstraint”)。Swift 4完整解决方案。
我在所有需要它的项目中都使用它
在视图上,将显示“注册”以侦听键盘显示/隐藏,并使用以下功能上下移动视图
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
subscribeToKeyboardNotifications()
}
// stop listening for changes when view is dissappearing
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
unsubscribeFromKeyboardNotifications()
}
// listen for keyboard show/show events
func subscribeToKeyboardNotifications() {
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow(_:)), name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide(_:)), name: .UIKeyboardWillHide, object: nil)
}
func unsubscribeFromKeyboardNotifications() {
NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillHide, object: nil)
}
@objc func keyboardWillHide(_ notification: Notification) {
view.frame.origin.y = 0
}
在我的例子中,我在底部有一个文本字段,它被键盘隐藏,所以如果这是在使用中,那么我会向上移动视图
@objc func keyboardWillShow(_ notification: Notification) {
if bottomTextField.isFirstResponder {
view.frame.origin.y = -getKeyboardHeight(notification: notification)
}
}
func getKeyboardHeight(notification: Notification) -> CGFloat {
let userInfo = notification.userInfo
let keyboardSize = userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue
return keyboardSize.cgRectValue.height
}
看看这个谢谢@BoilingLime,它很有效。:-)