我有一个 View ，它在键盘出现时调整约束的大小。因此，当键盘出现和消失时，我会收到通知。
当键盘已经显示并且我旋转屏幕时会发生上述行为。然后发生下一个 Action :
- 已调用 UIKeyboardWillHideNotification
- 调用了 UIKeyboardWillShowNotification(使用键盘的旧高度)
- 调用了 UIKeyboardWillShowNotification(使用新的键盘高度)
因此，updateView 函数首先接收一个高度，然后接收一个不同的高度。这会导致 View 奇怪地移动两倍的值。
override func viewDidLoad() {
super.viewDidLoad()
// Creates notification when keyboard appears and disappears
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)
}
deinit {
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}
func keyboardWillShow(notification: NSNotification) {
self.adjustingHeight(true, notification: notification)
}
func keyboardWillHide(notification: NSNotification) {
self.adjustingHeight(false, notification: notification)
}
private func adjustingHeight(show: Bool, notification: NSNotification) {
// Gets notification information in an dictionary
var userInfo = notification.userInfo!
// From information dictionary gets keyboard’s size
let keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
// Gets the time required for keyboard pop up animation
let animationDurarion = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! NSTimeInterval
// Animation moving constraint at same speed of moving keyboard & change bottom constraint accordingly.
if show {
self.bottomConstraint.constant = (CGRectGetHeight(keyboardFrame) + self.bottomConstraintConstantDefault / 2)
} else {
self.bottomConstraint.constant = self.bottomConstraintConstantDefault
}
UIView.animateWithDuration(animationDurarion) {
self.view.layoutIfNeeded()
}
self.hideLogoIfSmall()
}
最佳答案
终于找到了解决办法。当我得到 keyboardFrame 时，我使用的是 UIKeyboardFrameBeginUserInfoKey，它会在动画开始之前返回键盘的框架。正确的做法是使用 UIKeyboardFrameEndUserInfoKey，它会在动画完成后返回键盘的框架。
let keyboardFrame: CGRect = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
关于ios - 旋转后接收两个不同高度的键盘，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35223224/